A comprehensive testing method for communication interference cancellation device

Abstract

The application belongs to the technical field of communication anti-interference, and specifically discloses a comprehensive testing method for a communication interference countermeasure device. The method comprises the following steps: S1, a corresponding test scene is built according to a to-be-tested performance index, a general testing instrument is connected with the communication interference countermeasure device, and the communication interference countermeasure device is set to a working state; S2, in the test scene, the functional state of the communication interference countermeasure device is adjusted, test data in the functional state are collected through the general testing instrument, and the quantitative test result of the to-be-tested performance index is determined according to the test data in the functional state and according to a pre-designed calculation method; the functional state at least comprises one of a bypass state and a countermeasure state; S3, S1 to S2 are repeatedly executed, and the final test result of the to-be-tested performance index is determined according to the quantitative test results. Through the application, a complete test index system is constructed, and the comprehensive capability of the communication interference countermeasure device in an interference environment can be effectively evaluated.

Description

Technical Field

[0001] This application belongs to the field of communication anti-interference technology, specifically relating to a comprehensive testing method for a communication interference cancellation device. Background Technology

[0002] Communication jamming cancellation devices are crucial for ensuring the normal operation of communication systems in complex electromagnetic environments, and their performance directly determines the availability of communication links under strong interference conditions. With the rapid development of electronic countermeasures technology, jamming patterns are becoming increasingly diverse and intelligent, placing higher demands on communication jamming cancellation devices.

[0003] Currently, conventional communication interference cancellation testing primarily focuses on metrics such as transmission rate, signal-to-noise ratio, bit error rate, and latency for communication systems, while testing for interference systems emphasizes parameters like interference power, interference frequency band, and interference pattern. However, these testing methods are limited in scope, reflecting only individual performance aspects of either the communication or interference systems, and cannot directly characterize the comprehensive "interference suppression and continuity maintenance" capability of communication interference cancellation devices under interference conditions. For example, simply testing the bit error rate change of a communication system makes it difficult to distinguish whether it's a result of the communication interference cancellation device's effect or fluctuations in the communication link's own performance; similarly, measuring only the output power of the jammer fails to demonstrate the interference suppression effect of the communication interference cancellation device. More importantly, existing testing methods lack a dedicated index system for testing the specific working mechanisms and performance of communication interference cancellation devices, making it impossible to effectively evaluate their comprehensive performance.

[0004] Therefore, how to more accurately and comprehensively evaluate the overall performance of communication interference cancellation devices has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to evaluate the performance of communication interference cancellation devices more accurately and comprehensively, and to solve the problem that the existing technology cannot effectively evaluate the comprehensive ability of communication interference cancellation devices to "anti-interference and maintain communication" in interference environment due to the single test dimension.

[0006] To achieve the above objectives, this application provides a comprehensive testing method for communication interference cancellation devices, comprising: S1. Build a corresponding test scenario based on the performance indicators to be tested, connect the general test instrument with the communication interference cancellation device, and set the communication interference cancellation device to the working state. S2, under the test scenario, adjust the functional state of the communication interference cancellation device, collect test data under the functional state through the general test instrument, and determine the quantitative test result of the performance index to be tested according to the test data under the functional state and a preset calculation method; the functional state includes at least one of bypass state and cancellation state; S3, repeat S1 to S2, and determine the final test result of the performance index to be tested based on the results of multiple quantitative tests; The performance indicators to be tested include at least one of the following: improved self-interference tolerance, improved external interference tolerance, external interference processing time, external interference signal reception delay, self-interference processing time, self-interference synchronization cancellation bandwidth, minimum interference frequency interval for self-interference, and intermediate frequency access insertion loss.

[0007] Optionally, the performance indicator to be tested is the improvement in self-disruption tolerance, and S2 includes: When the signal emitted by the radio frequency signal generator is used as the test interference signal, the communication interference cancellation device is switched to bypass state and cancellation state respectively. The first power of the test interference signal at the current frequency point in the bypass state and the second power of the test interference signal at the current frequency point in the cancellation state are obtained by using a spectrum analyzer; the test data in the functional state includes the first power and the second power. The difference between the first power and the second power is determined, and the difference is used as the quantitative test result of the improvement in the anti-interference tolerance; the general-purpose test instrument includes the spectrum analyzer.

[0008] Optionally, the performance indicator to be tested is an improvement in the first immunity to interference, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is disconnected from the communication device it is connected to. After using a radio frequency signal generator to output an interference signal and switching the communication interference cancellation device to bypass mode, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the first interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using a spectrum analyzer. Reduce the power of the interference signal to eliminate the communication link anomaly; After connecting the communication interference cancellation device to the communication equipment and switching from the bypass state to the cancellation state, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the second interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using the spectrum analyzer. The difference between the intensity of the first interference signal and the intensity of the second interference signal is used as the quantitative test result of the improvement of the first interference immunity tolerance; the improvement of interference immunity tolerance includes the improvement of the first interference immunity tolerance, and the general test instrument includes the spectrum analyzer.

[0009] Optionally, the performance indicator to be tested is a second immunity to interference improvement, and S2 includes: When communication links are established between communication devices, the communication interference cancellation device is switched to bypass mode, and the radio frequency signal generator outputs an interference signal to interfere with the communication link. The power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached a preset performance threshold value, and the first output power of the radio frequency signal generator is recorded. After removing the interference from the radio frequency signal generator, the communication interference cancellation device is switched from the bypass state to the cancellation state. The radio frequency signal generator is used again to output an interference signal to interfere with the communication link, and the power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached the preset performance threshold value. The second output power of the radio frequency signal generator is recorded at this time. The difference between the second output power and the first output power is used as the quantitative test result of the improvement in the second interference immunity tolerance; the improvement in interference immunity tolerance includes the improvement in the second interference immunity tolerance, and the general test instrument includes the monitoring instrument.

[0010] Optionally, the performance indicator to be tested is the anti-interference processing time, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. The first moment when the interference signal appeared and the second moment when the communication interference cancellation device output a valid communication signal under the action of the interference signal were recorded using an oscilloscope. A first time difference is determined between the second time point and the first time point, and the first time difference is used as the quantitative test result of the anti-interference processing time; the general-purpose test instrument includes the oscilloscope; or, When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. By setting the zero-sweep mode using a spectrum analyzer, the spectrum analyzer simultaneously records the third moment when the interference signal appears and the fourth moment when the power amplitude of the communication signal output by the communication interference cancellation device converges under the action of the interference signal. A second time difference is determined between the fourth time point and the third time point, and the second time difference is used as the quantitative test result of the anti-interference processing time; the general-purpose test instrument includes the spectrum analyzer.

[0011] Optionally, the performance indicator to be tested is the delay in receiving interference-resistant signals, and step S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is set to cancellation state, and the signal generator is controlled to output an interference signal. The spectrum analyzer is set to zero-sweep mode, and the spectrum analyzer is used to record the first moment when the interference signal is input and the second moment when the communication interference cancellation device outputs a valid communication signal. The time difference between the second time point and the first time point is determined, and the time difference is used as the quantization test result of the anti-interference signal reception delay; the general test instrument includes the spectrum analyzer.

[0012] Optionally, the performance indicator to be tested is the self-disturbance processing time, and S2 includes: After switching the communication interference cancellation device to bypass mode, the radio frequency signal generator is controlled to output an interference signal; The power time-domain response process of the interference signal is captured using a spectrum analyzer, and the time-domain waveforms of the maximum interference signal power and the first signal power of the interference signal in the bypass state are recorded. The radio frequency signal generator is then turned off. Switch the communication interference cancellation device from the bypass state to the cancellation state, control the radio frequency signal generator to output the interference signal again, and make the interference signal gradually reach the maximum interference signal power. Record the second signal power time-domain waveform of the interference signal in the current cancellation state through the spectrum analyzer. The time-domain waveforms of the first signal power and the second signal power are compared and analyzed to determine the transition time from zero to convergence of the self-interference tolerance improvement, and the transition time is used as the quantitative test result of the self-interference processing time; the general-purpose test instrument includes the spectrum analyzer.

[0013] Optionally, the performance indicator to be tested is the self-disruption synchronization cancellation bandwidth, and S2 includes: Control two radio frequency signal generators to output a first interference signal at a first frequency and a second interference signal at a second frequency; The communication interference cancellation device is switched to bypass mode and cancellation mode respectively. The first power of the first interference signal and the second power of the second interference signal in bypass mode are measured by spectrum analyzer, and the third power of the first interference signal and the fourth power of the second interference signal in cancellation mode are measured by spectrum analyzer. When the first difference between the first power and the third power and the second difference between the second power and the fourth power are both greater than a preset threshold, the second frequency is gradually changed until the first difference or the second difference is less than the preset threshold, the current test is stopped, and the maximum frequency bandwidth that satisfies the first difference and the second difference being greater than the preset threshold is determined. The maximum frequency bandwidth is used as the quantitative test result of the anti-self-interference synchronization cancellation bandwidth; the general-purpose test instrument includes the spectrum analyzer.

[0014] Optionally, the performance index to be tested is the minimum interference-to-signal frequency spacing against self-interference, and S2 includes: The frequency and power of the communication signal output by the first radio frequency signal generator are fixed, and the power of the interference signal output by the second radio frequency signal generator is fixed. The frequency of the interference signal is adjusted, and the communication interference cancellation device is switched to bypass state and cancellation state respectively. The first power of the communication signal in the bypass state and the second power in the cancellation state, as well as the frequency of the interference signal in the cancellation state, are measured by a spectrum analyzer. Based on the second power and the first power, determine the attenuation power of the communication signals before and after cancellation; When the attenuation power is less than a preset fixed threshold, the frequency interval between the current communication signal and the interference signal is determined, and the frequency interval is used as the quantitative test result of the minimum interference frequency interval for anti-self-interference; the general test instrument includes the spectrum analyzer.

[0015] Optionally, the performance indicator to be tested is intermediate frequency access insertion loss; S2 includes: Switch the communication interference cancellation device to bypass mode and control the vector network analyzer to measure the insertion loss value between the signal input port and the signal output port within the operating frequency band. The maximum value of the insertion loss value within the operating frequency band is determined, and the maximum value is used as the quantitative test result of the intermediate frequency access insertion loss; the general-purpose test instrument includes a vector network analyzer, and the two test ports of the vector network analyzer are respectively connected to the signal input port and the signal output port of the communication interference cancellation device.

[0016] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: (1) The comprehensive test method for a communication interference cancellation device provided in this application incorporates multiple performance indicators such as anti-self-interference tolerance improvement, anti-self-interference processing time, anti-self-interference synchronous cancellation bandwidth, anti-self-interference minimum interference frequency interval, intermediate frequency access insertion loss, anti-other interference tolerance improvement, anti-other interference processing time, and anti-other interference signal reception delay into a unified test framework. It constructs a complete test indicator system covering key dimensions such as interference signal reception capability, cancellation efficiency, link loss, algorithm response speed, and signal delay. It also establishes "building a test scenario - switching between bypass / cancellation states - comparative calculation" as a unified operation specification that runs through multiple test indicators. It extracts a general test paradigm applicable to the performance evaluation of communication interference cancellation devices, so that the tests of different performance indicators follow the same methodological framework. It can effectively evaluate the comprehensive capability of communication interference cancellation devices in interference environments, solve the problem that the existing technology has a single test dimension and cannot fully reflect the comprehensive performance of communication interference cancellation devices. At the same time, it significantly improves the standardization of the test process and the repeatability and comparability of the results.

[0017] (2) The comprehensive test method for a communication interference cancellation device provided in this application uses general-purpose test instruments such as spectrum analyzers, oscilloscopes, vector network analyzers, and radio frequency signal generators. It does not require the construction of a special complex test platform, has low test cost and strong feasibility, and is suitable for various application scenarios such as research and development verification, factory acceptance and field performance evaluation throughout the entire life cycle of the equipment.

[0018] (3) The comprehensive test method for a communication interference cancellation device provided in this application injects the test interference signal generated by the radio frequency signal generator into the communication interference cancellation device, and uses a spectrum analyzer to measure the interference power at the current frequency of the communication signal output port in the bypass state and the cancellation state respectively. The power difference between the two functional states is used as the quantitative test result of the self-interference tolerance improvement. The final result is determined by statistical analysis after repeated tests. This overcomes the defect of the prior art that cannot directly quantify and evaluate the actual cancellation depth of the self-interference signal of the communication interference cancellation device. Only general test instruments such as spectrum analyzers are needed to realize the accurate and repeatable quantitative test of the self-interference tolerance improvement index in a standardized test scenario. This provides a reliable test basis for the objective evaluation and optimization design of the self-interference performance of the communication interference cancellation device. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the comprehensive testing method for the communication interference cancellation device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the test circuit structure for improving the self-interference tolerance of the communication interference cancellation device provided in the embodiments of this application; Figure 3This is a schematic diagram of the test circuit structure for improving the first anti-interference tolerance of the communication interference cancellation device provided in the embodiments of this application; Figure 4 This is a schematic diagram of the test circuit structure for improving the second anti-interference tolerance of the communication interference cancellation device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the time-domain test circuit structure for the anti-interference processing time of the communication interference cancellation device provided in this application embodiment; Figure 6 This is a schematic diagram of the frequency domain test circuit structure for the anti-interference processing time of the communication interference cancellation device provided in this application embodiment; Figure 7 This is a schematic diagram of the test circuit structure for the anti-self-interference synchronization cancellation bandwidth of the communication interference cancellation device provided in this application embodiment; Figure 8 This is a schematic diagram illustrating the calculation of anti-self-interference synchronization cancellation bandwidth test data provided in an embodiment of this application; Figure 9 This is a schematic diagram of the test circuit structure for the minimum self-interference frequency interval of the communication interference cancellation device provided in the embodiments of this application; Figure 10 This is a schematic diagram of the test circuit structure for intermediate frequency access insertion loss of the communication interference cancellation device provided in the embodiments of this application; Figure 11 This is a schematic diagram of the test circuit structure for the auxiliary antenna G / T value of the communication interference cancellation device provided in the embodiments of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first power" and "second power," etc., are used to distinguish different powers, not to describe a specific order of power.

[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0023] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more, for example, multiple processing units means two or more processing units, multiple elements means two or more elements, etc.

[0024] Regarding testing methods, existing technologies typically test the communication system and the interference system separately, making it difficult to consider their collaborative operation and to reuse general-purpose testing equipment for efficient testing. For example, some testing methods require the construction of complex dedicated testing environments, resulting in long testing cycles, high costs, and difficulty in guaranteeing the repeatability and comparability of test results. Other methods, while capable of assessing anti-interference effectiveness, lack quantitative testing means for key internal components of the equipment (such as intermediate frequency access insertion loss, processing time, and reception delay), leading to test results that cannot accurately pinpoint performance bottlenecks and hinder guidance for equipment optimization design.

[0025] To address the aforementioned issues, there is an urgent need in this field to establish a set of test index systems and corresponding comprehensive test methods specifically for communication interference cancellation equipment. This system should be able to comprehensively and accurately evaluate the actual performance of the equipment under interference conditions, providing a reliable basis for the development, acceptance, and performance optimization of the equipment.

[0026] It should be noted that the various defects in the technical solutions of the prior art are the result of careful practical research. Therefore, the discovery process of the above problems and the solutions proposed by the embodiments of this application in the following text should be considered as contributions to the implementation of this application.

[0027] The embodiments of this application are described below with reference to the accompanying drawings.

[0028] Figure 1 This is a flowchart illustrating the comprehensive testing method for the communication interference cancellation device provided in this application embodiment, as shown below. Figure 1 As shown, the method includes: Step S1: Build the corresponding test scenario according to the performance index to be tested, connect the general test instrument with the communication interference cancellation device, and set the communication interference cancellation device to the working state. Step S2: In the test scenario, adjust the functional state of the communication interference cancellation device, collect test data under the functional state using a general test instrument, and determine the quantitative test results of the performance index to be tested according to the preset calculation method based on the test data under the functional state; the functional state includes at least one of bypass state and cancellation state. Step S3: Repeat steps S1 to S2 to determine the final test result of the performance index to be tested based on the results of multiple quantitative tests. The performance indicators to be tested shall include at least one of the following: improvement of self-interference tolerance, improvement of other interference tolerance, other interference processing time, other interference signal reception delay, self-interference processing time, self-interference synchronization cancellation bandwidth, minimum interference frequency interval for self-interference and intermediate frequency access insertion loss.

[0029] Specifically, in the embodiments of this application, in step S1, a corresponding test scenario is built according to the performance index to be tested, and a general-purpose test instrument is connected to a communication interference cancellation device (which can also be simply referred to as a "cancellation device" for ease of description), and the communication interference cancellation device is set to the working state. In actual operation, the communication interference cancellation device faces various complex interference environments, such as self-interference (interference from its own transmitter to the receiver) and other-interference (external non-cooperative interference sources). Different performance indexes to be tested correspond to differences in the injection method of interference signals, signal paths, and instrument connection topologies; therefore, it is necessary to build a test scenario that matches the specific performance index to be tested. By connecting the general-purpose test instrument and the communication interference cancellation device according to the interface relationship required by the performance index to be tested, and placing the communication interference cancellation device in a normal powered-on working state, a repeatable and standardized test environment foundation is provided for the subsequent accurate acquisition of test data under controlled conditions.

[0030] Here, communication interference cancellation devices typically consist of an auxiliary antenna and a cancellation cabinet. The auxiliary antenna receives interference signals, and the cancellation cabinet performs interference cancellation processing, restoring the interference-free signal from the communication equipment. Communication interference cancellation devices can be divided into two main categories: self-interference suppression and external interference suppression. Self-interference usually refers to cooperative interference from co-located platforms, while external interference usually refers to non-cooperative interference from non-co-located platforms. Typical compatible communication equipment includes: shortwave radios, VHF radios, navigation receivers, data link communication equipment, and communication satellites.

[0031] In the embodiments of this application, the performance indicators to be tested include at least one of the following: self-interference tolerance improvement, other-interference tolerance improvement, other-interference processing time, other-interference signal reception delay, self-interference processing time, self-interference synchronization cancellation bandwidth, minimum interference frequency spacing for self-interference, and intermediate frequency access insertion loss. Specifically, the self-interference / other-interference tolerance improvement is used to evaluate the ability of the communication interference cancellation device to maintain normal communication operation in an interference environment; the self-interference / other-interference processing time is used to evaluate the time required for the anti-interference algorithm to converge and stabilize from the occurrence of interference; the other-interference signal reception delay is used to evaluate the phase delay introduced by the anti-interference processing to the communication signal; the self-interference synchronization cancellation bandwidth is used to evaluate the bandwidth range that the self-interference device can simultaneously cancel; the minimum interference frequency spacing for self-interference is used to evaluate the frequency spacing that does not affect the useful signal when the communication interference cancellation device cancels interference signals; and the intermediate frequency access insertion loss is used to quantify the power loss of the received signal after the communication interference cancellation device is embedded in the communication link.

[0032] Optionally, the performance indicators to be tested may also include the sampling antenna G / T value and the interference immunity dead zone. The sampling antenna G / T value is used to evaluate the ability of the active auxiliary antenna to receive interference signals; the interference immunity dead zone is used to determine the performance degradation or failure area of ​​the communication interference cancellation device in a specific direction of interference arrival.

[0033] In the embodiments of this application, in step S2, under the established test scenario, the functional state of the communication interference cancellation device is adjusted, and test data under different functional states are collected by a general test instrument, and then the quantitative test results of the performance index to be tested are determined according to the preset calculation method.

[0034] Here, the functional states of the communication interference cancellation device include at least a bypass state and a cancellation state. In the bypass state, the internal cancellation processing channel of the communication interference cancellation device is either directly open or closed, and the signal is output directly without cancellation processing. This is used to obtain the baseline performance data of the communication system or the direct reference data of the interference signal in the absence of cancellation intervention. In the cancellation state, the communication interference cancellation device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the interference signal, thereby obtaining the signal data after cancellation processing. By collecting test data under the above different functional states and quantifying the collected test data according to the preset calculation method, the quantitative test results of each performance index to be tested are obtained.

[0035] Specifically, for different performance indicators to be tested, the methods for data collection and quantification are as follows: When the performance index to be tested is the improvement of self-interference tolerance or the improvement of other interference tolerance, power data related to interference suppression effectiveness are collected in bypass state and cancellation state respectively. The interference power difference or the attenuation of interference power before and after cancellation is calculated according to the preset calculation method to quantify the dynamic suppression gain of the communication interference cancellation device on self-interference or other interference signals.

[0036] When the performance index to be tested is the self-interference processing time or the external interference processing time, the time-domain process from the injection of the interference signal to the stable convergence state of the cancellation output is captured by a general testing instrument. The time interval required for the cancellation effect to rise from the initial state and stabilize to the preset cancellation threshold is measured according to the preset calculation method, so as to quantify the convergence response speed of the cancellation device.

[0037] When the performance index to be tested is the delay in receiving interference signals, the time when the test signal is input to the communication interference cancellation device and the time when it is stably output after cancellation are collected by a general testing instrument. The time difference between the two is calculated according to the preset calculation method to quantify the signal transmission delay introduced by the cancellation process.

[0038] When the performance index to be tested is the anti-self-interference synchronous cancellation bandwidth, by inputting multi-frequency or broadband combined interference signals, the signal frequency interval or bandwidth is gradually adjusted, test data of the cancellation effect changing with frequency is collected, and the maximum frequency coverage range that meets the predetermined cancellation depth requirement is determined according to the preset calculation method.

[0039] When the performance index to be tested is the minimum interference frequency interval for anti-self-interference, under the premise of fixing the power of the useful communication signal and the interference signal, the frequency interval between the interference signal and the useful signal is gradually reduced, test data of the useful signal quality changing with the frequency interval is collected, and the minimum frequency offset when the useful signal quality attenuation does not exceed the allowable threshold is determined according to the preset calculation method.

[0040] When the performance indicator to be tested is the intermediate frequency access insertion loss, the power data of the signal passing through the input and output ports of the intermediate frequency channel of the communication interference cancellation device is collected by a general test instrument in the bypass state. The maximum power attenuation value is calculated according to the preset calculation method to quantify the link loss of the communication signal caused by the intermediate frequency channel of the cancellation device.

[0041] Furthermore, in the embodiments of this application, in step S3, steps S1 to S2 are repeated to determine the final test result of the performance index to be tested based on the results of multiple quantitative tests. Since there may be thermal noise fluctuations, instrument measurement uncertainties, and the randomness of the cancellation algorithm's convergence process in the test environment, a single test result may contain random errors. By repeatedly executing the above measurement process under the same test scenario, and performing statistical analysis on the obtained multiple sets of quantitative test results, a final test result with high confidence and repeatability is obtained, thereby ensuring the rigor and objectivity of the test evaluation.

[0042] The comprehensive testing method of this application incorporates multiple performance indicators, such as improved anti-interference tolerance, anti-interference processing time, anti-interference synchronization cancellation bandwidth, minimum interference frequency interval for anti-interference, intermediate frequency access insertion loss, improved anti-interference tolerance, anti-interference processing time, and anti-interference signal reception delay, into a unified testing framework. This constructs a complete testing indicator system covering key dimensions such as interference signal reception capability, cancellation efficiency, link loss, algorithm response speed, and signal delay. Furthermore, it establishes "setting up a test scenario—bypass / cancellation state switching—comparative calculation" as a unified operational standard across multiple testing indicators. This refines a general testing paradigm applicable to the performance evaluation of communication interference cancellation devices, ensuring that tests of different performance indicators follow the same methodological framework. This effectively evaluates the comprehensive capabilities of communication interference cancellation devices under interference environments, solving the problem of existing technologies having a single testing dimension and failing to comprehensively reflect the comprehensive performance of communication interference cancellation devices. It also significantly improves the standardization of the testing process and the repeatability and comparability of the results.

[0043] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the improvement of self-disruption tolerance, and step S2 includes: When the signal emitted by the radio frequency signal generator is used as the test interference signal, the communication interference cancellation device is switched to bypass mode and cancellation mode respectively. The first power of the interference signal at the current frequency in the bypass state and the second power of the interference signal at the current frequency in the cancellation state are obtained by using a spectrum analyzer; the test data in the functional state includes the first power and the second power. Determine the difference between the first power and the second power, and use the difference as the quantitative test result of the improvement in the self-disruption tolerance; The general-purpose test instruments include a spectrum analyzer, and the communication signal output port of the communication interference cancellation device is connected to the radio frequency input port of the spectrum analyzer.

[0044] Specifically, in the embodiments of this application, when the performance indicator to be tested is the improvement of self-interference tolerance, step S1 establishes a corresponding test scenario according to the test requirements of this indicator. Improvement of self-interference tolerance is used to evaluate the ability of a communication interference cancellation device to maintain normal communication operation in a self-interference environment. Self-interference refers to cooperative interference on a co-located platform, i.e., interference caused by the leakage of the communication system's own transmitter signal to the local receiving link.

[0045] like Figure 2 The schematic diagram of the test circuit shown illustrates how, under controlled conditions, the output of the RF signal generator 1 is connected to the interference signal input channel of the cancellation device 3 via a power amplifier 2. The signal emitted by the RF signal generator 1 is used as the test interference signal. Simultaneously, the communication signal output port of the cancellation device 3 is connected to the RF input port of the spectrum analyzer 4, which is responsible for collecting the test data at the communication signal output port. Coupler 5 is connected to both the cancellation device 3 and the load 6. The main function of the load 6 is to provide a standard RF impedance matching terminal for the cancellation device, preventing signal reflection due to impedance mismatch at the port. This avoids the reflected wave affecting the measurement accuracy of the spectrum analyzer at the output port after transmission through the cancellation device, ensuring good impedance matching throughout the test link. Specifically, the input of coupler 5 is connected to the interference signal coupling terminal of the cancellation device 3, the output of coupler 5 is connected to the communication port of the cancellation device 3 to simulate the self-interference signal, and the isolation port of coupler 5 is connected to the load 6 to absorb excess reflected signals from the coupler. After debugging the radio frequency signal generator, setting the transmission frequency, working mode and power, and making its transmission signal serve as the test interference signal, the communication interference cancellation device is in normal working condition after being powered on, and the test scenario is set up.

[0046] In the embodiments of this application, in step S2, under the above test scenario, the communication interference cancellation device is switched to bypass state and cancellation state respectively, and the power data of the test interference signal at the current frequency point is collected by the spectrum analyzer under the two functional states respectively.

[0047] In bypass mode, the internal cancellation processing channel of the communication interference cancellation device is either directly open or closed. The test interference signal emitted by the RF signal generator is transmitted directly to the communication signal output port without any cancellation processing. The spectrum analyzer measures and records the interference signal power at the current frequency point, i.e., the first power. The first power characterizes the residual power level of the interference signal at the communication signal output terminal when the cancellation function of the communication interference cancellation device is not activated, and constitutes the interference benchmark reference value for this test.

[0048] In the cancellation state, the communication interference cancellation device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the injected test interference signal. The spectrum analyzer measures and records the power of the interference signal at the communication signal output at the same frequency point, which is the second power. The second power reflects the residual power level of the interference signal at the communication signal output after cancellation processing in the normal cancellation working state of the communication interference cancellation device.

[0049] It is understood that the test data in the functional state includes the aforementioned first power and second power. According to the preset calculation method, the difference between the first power and the second power is determined, and this difference is used as the quantitative test result of the improvement in self-interference tolerance in this test. This difference directly characterizes the actual cancellation depth of the communication interference cancellation device on the self-interference signal at the current frequency point, objectively quantifying the interference suppression gain obtained after the cancellation device is activated compared to the inactive state.

[0050] Furthermore, in the embodiments of this application, in step S3, steps S1 to S2 are repeated, and the above-mentioned switching measurement process between bypass state and cancellation state is repeatedly executed at multiple test frequency points to obtain multiple sets of differences between the first power and the second power. Statistical analysis is performed on the multiple quantization test results, and the minimum value is taken to obtain the final test result with high confidence and repeatability of anti-interference tolerance improvement. Through multiple repeated tests, the random errors introduced by instrument measurement uncertainty, cancellation algorithm convergence randomness, and environmental noise fluctuations in a single measurement can be effectively eliminated, ensuring the rigor and objectivity of the test evaluation.

[0051] The method of this application injects a test interference signal generated by a radio frequency signal generator into a communication interference cancellation device. A spectrum analyzer is used to measure the interference power at the current frequency of the communication signal output port in both bypass and cancellation states. The power difference between the two functional states is used as the quantitative test result of the self-interference tolerance improvement. The final result is determined by statistical analysis after repeated tests. This method overcomes the deficiency of existing technologies that cannot directly quantify and evaluate the actual cancellation depth of the self-interference signal by the communication interference cancellation device. Only general-purpose test instruments such as a spectrum analyzer are needed to achieve accurate and repeatable quantitative testing of the self-interference tolerance improvement index in a standardized test scenario. This provides a reliable test basis for the objective evaluation and optimization design of the self-interference resistance performance of the communication interference cancellation device.

[0052] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the improvement of the first anti-interference tolerance, and S2 includes: When establishing a communication link between communication devices, disconnect the communication interference cancellation device from the communication device it is connected to; After using a radio frequency signal generator to output an interference signal and switching the communication interference cancellation device to bypass mode, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the first interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using a spectrum analyzer. Reduce the power of interference signals to eliminate communication link anomalies; After connecting the communication interference cancellation device to the communication equipment and switching from bypass mode to cancellation mode, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the second interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using a spectrum analyzer. The difference between the strength of the first interference signal and the strength of the second interference signal is used as the quantitative test result of the improvement of the first anti-interference tolerance; the general test instrument includes a spectrum analyzer, and the communication signal output port of the communication interference cancellation device is connected to the radio frequency input port of the spectrum analyzer.

[0053] Specifically, in the embodiments of this application, when the performance indicator to be tested is the improvement of the first anti-interference tolerance, step S1 establishes a corresponding test scenario according to the test requirements of this indicator. The improvement of the first anti-interference tolerance is used to quantitatively evaluate the ability of the communication interference cancellation device to maintain the normal operation of the communication link under interference environment by direct testing with a spectrum analyzer (direct testing method). Interference refers to non-cooperative interference from non-co-located platforms, that is, interference exerted on the receiving link of the communication system by external interference sources. Figure 3As shown, to establish a quantifiable communication link under controlled conditions, the communication signal output by communication device 7 is attenuated by attenuator 15 before being transmitted by communication antenna 701. Communication device 8 transmits communication signals through communication antenna 801. When the two sets of communication devices establish a communication link and are in normal communication mode, interference signals are simultaneously transmitted through interference antenna 101 of RF signal generator 1 and interference antenna 1301 of RF signal generator 13, interfering with communication antenna 801. The monitoring antenna 401 of spectrum analyzer 4 is located near the cancellation device 3, and the spectrum analyzer 4 is responsible for measuring the interference signal strength at the auxiliary antenna. After power-on, the cancellation device 3 is in normal working mode, and the test scenario is completed.

[0054] In the embodiments of this application, in step S2, under the above test scenario, the first interference signal strength and the second interference signal strength are obtained respectively according to the following steps.

[0055] First, disconnect the communication interference cancellation device from the communication equipment it is connected to, temporarily disconnecting the device from the communication link. The purpose of this operation is to determine the interference power reference when the communication link is just about to malfunction in bypass mode, eliminating the influence of the cancellation device's connection to the communication link on the communication link's state, and ensuring that subsequent interference power reference measurements in bypass mode only reflect the communication link's own tolerance to interference signals.

[0056] Next, the communication interference cancellation device is switched to bypass mode, and an interference signal is applied to the communication link using a radio frequency signal generator, with the power of the interference signal gradually increased. During this process, the operating status of the communication link is continuously monitored until the link begins to malfunction. Here, a communication link malfunction means that the communication quality indicators (such as bit error rate, voice quality, or data transmission integrity) exceed a preset threshold, indicating that the interference signal has substantially affected the normal operation of the communication link. At the exact moment the communication link malfunctions, the interference signal strength at the auxiliary antenna of the communication interference cancellation device is measured and recorded using a spectrum analyzer; this is the first interference signal strength. The first interference signal strength characterizes the maximum interference signal strength threshold that the communication link can withstand without the cancellation device connected, constituting the interference benchmark reference value for this test.

[0057] Subsequently, the power of the interference signal output by the RF signal generator is reduced to eliminate the abnormal state of the communication link and restore the communication link to the normal communication state, providing consistent initial conditions for subsequent tests under the cancellation state.

[0058] Next, the communication interference cancellation device is reconnected to the communication equipment and switched from bypass mode to cancellation mode. The communication interference cancellation device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the injected interference signal. In cancellation mode, an interference signal is applied to the communication link again using a radio frequency signal generator, and the power of the interference signal is gradually increased. The operating status of the communication link is continuously observed until the communication link begins to malfunction again. At the exact moment the communication link malfunctions, the interference signal strength at the auxiliary antenna of the communication interference cancellation device is measured and recorded using a spectrum analyzer; this is the second interference signal strength. Here, the second interference signal strength characterizes the maximum interference signal strength threshold that the communication link can withstand under the condition that the communication interference cancellation device is connected and the cancellation function is activated.

[0059] Understandably, the test data in this functional state includes the strength of the first interference signal and the strength of the second interference signal. According to a preset calculation method, the difference between the strength of the second interference signal and the strength of the first interference signal is determined, and this difference is used as the quantitative test result of the improvement in the first anti-interference tolerance. This difference directly characterizes the improvement in the communication link's ability to withstand interference signals after the communication interference cancellation device is connected to the communication link and the cancellation function is enabled, objectively quantifying the actual gain of the cancellation device in the "anti-interference and continuity" capability of the communication link under interference scenarios.

[0060] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By changing the arrival angle and interference pattern of the interference signal, as well as the pattern, frequency, and working mode of the communication signal, the difference between the intensity of the first interference signal and the intensity of the second interference signal is obtained under various combinations of test conditions. The results of multiple quantitative tests are statistically analyzed, and the minimum value of multiple measurement results is taken as the first anti-interference tolerance of the communication interference cancellation device to improve the final test result. This eliminates the random errors introduced by communication link status fluctuations, instrument measurement uncertainties, and the randomness of cancellation algorithm convergence in a single measurement, ensuring the rigor and objectivity of the test evaluation.

[0061] The method in this application embodiment first disconnects the communication interference cancellation device from the communication equipment and determines the first interference signal strength benchmark when the communication link just happens to be abnormal in the bypass state. Then, it connects the communication interference cancellation device to the communication equipment and determines the second interference signal strength when the communication link just happens to be abnormal in the cancellation state. The difference between the two is used as the quantitative test result of the improvement of the first anti-interference tolerance. This overcomes the defect of the prior art that cannot directly quantify and evaluate the actual improvement of the communication link anti-interference capability of the communication interference cancellation device in the case of interference. Only general testing instruments such as spectrum analyzers are needed to achieve accurate and repeatable quantitative testing of the improvement index of the first anti-interference tolerance in a standardized testing scenario. This provides a reliable test basis for the objective evaluation and optimization design of the anti-interference performance of the communication interference cancellation device.

[0062] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the improvement in the second anti-interference tolerance, and S2 includes: When communication links are established between communication devices, the communication interference cancellation device is switched to bypass mode, and the radio frequency signal generator outputs an interference signal to interfere with the communication link. The power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached the preset performance threshold value, and the first output power of the radio frequency signal generator is recorded. After removing the interference from the radio frequency signal generator, the communication interference cancellation device is switched from bypass mode to cancellation mode. The radio frequency signal generator is used again to output interference signals to interfere with the communication link, and the power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached the preset performance threshold value. The second output power of the radio frequency signal generator is recorded at this time. The difference between the second output power and the first output power is used as the quantitative test result of the improvement in the second anti-interference tolerance. General-purpose testing instruments include monitoring instruments and the connection between the monitoring instruments and communication interference cancellation devices.

[0063] Specifically, in the embodiments of this application, when the performance indicator to be tested is the improvement of the second anti-interference tolerance, step S1 establishes a corresponding test scenario according to the test requirements of this indicator. The improvement of the second anti-interference tolerance is used to evaluate the improvement in the anti-interference capability of the communication link before and after the access of the communication interference cancellation device under interference conditions by monitoring the performance threshold of the communication system (coupled testing method). Figure 4As shown, to establish a quantifiable communication link under controlled conditions, communication devices 7 and 8 establish a communication link through communication antennas 701 and 801 and are in normal communication state. The cancellation device 3 is connected to the communication link, that is, the receiving end of communication device 7 is connected to monitoring instrument 9, and communication device 8 is connected to monitoring instrument 10 through the cancellation device 3. Simultaneously, the interference signal output by the RF signal generator 1 is transmitted to the cancellation device 3 through its interference antenna 101, and coupled into the interference signal injection channel through the auxiliary antenna of the cancellation device 3 to simulate the injection of external interference signals. The performance status of the communication system is calculated based on the real-time monitoring data from the two monitoring instruments to determine whether it has reached the preset performance threshold. The cancellation device 3 is in normal working state after power-on, and the test scenario is complete.

[0064] In the embodiments of this application, in step S2, under the above test scenario, the first output power and the second output power are obtained respectively according to the following steps.

[0065] First, with the communication link between communication devices operating normally, the communication interference cancellation device is switched to bypass mode. The cancellation processing channel inside the communication interference cancellation device is either directly connected or closed, and the communication link is in a baseline operating state without cancellation intervention. An interference signal is applied to the communication link using a radio frequency signal generator, and the output power of the interference signal is gradually adjusted. During this process, the performance status of the communication system is continuously monitored by a monitoring instrument until the monitoring instrument detects that the performance index of the communication system reaches a preset performance threshold. The preset performance threshold is a pre-set benchmark for judging the performance of the communication system, used to objectively determine whether the performance degradation of the communication system under the current interference conditions has reached the specified level. It can be calculated using existing algorithms. The baseline performance of the system under interference-free conditions is determined by using the baseline initial signal output by detection instrument 1 and the communication data monitored by monitoring instrument 2 under interference-free conditions. Then, through gradient interference injection and threshold iterative calculation, a stable system performance threshold that simultaneously meets the false alarm probability requirements and communication performance requirements can be obtained. This application will not elaborate on this aspect.

[0066] Then, at the moment when the monitoring instrument detects that the communication system has just reached the preset performance threshold, the output power of the radio frequency signal generator at this moment is recorded, which is the first output power. The first output power can characterize the level of interference power required to degrade the performance of the communication system to the preset performance threshold when the communication interference cancellation device is in bypass mode and the cancellation function is not activated, and constitutes the interference reference value for this test.

[0067] Subsequently, the interference output of the RF signal generator was removed to restore the performance of the communication link to normal, providing consistent initial conditions for subsequent tests under cancellation conditions and avoiding the impact of residual interference from the previous stage on subsequent measurement results.

[0068] Next, the communication interference cancellation device is switched from bypass mode to cancellation mode. The device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the injected interference signal. In cancellation mode, an interference signal is again applied to the communication link using a radio frequency signal generator, and the output power of the interference signal is gradually adjusted. The performance status of the communication system is continuously monitored by a monitoring instrument until the monitoring instrument detects that the performance indicators of the communication system have reached the same preset performance threshold as in the first stage. At the moment when the monitoring instrument detects that the communication system has just reached the preset performance threshold, the output power of the radio frequency signal generator at this time is recorded, i.e., the second output power. The second output power characterizes the level of interference power required to degrade the communication system performance to the same preset performance threshold when the communication interference cancellation device is in cancellation mode and the cancellation function is activated. Due to the suppression effect of the cancellation device on the interference signal, a higher interference power is required in cancellation mode to degrade the communication system performance to the same threshold; therefore, the second output power is usually higher than the first output power.

[0069] Understandably, the test data in this functional state includes the aforementioned first output power and second output power. According to a preset calculation method, the difference between the second output power and the first output power is determined, and this difference is used as the quantitative test result of the second interference tolerance improvement. This difference directly characterizes the increase in interference power that the communication system can withstand under the same performance threshold after the communication interference cancellation device is connected to the communication link and the cancellation function is enabled, objectively quantifying the actual gain of the cancellation device in improving the communication link's interference resistance capability.

[0070] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By changing the arrival angle and interference pattern of the interference signal, as well as the pattern, frequency, and working mode of the communication signal, the difference between the first output power and the second output power is obtained under various combinations of test conditions. The results of multiple quantitative tests are statistically analyzed, and the minimum value of multiple measurement results is taken as the second anti-interference tolerance of the communication interference cancellation device to improve the final test result. This eliminates the random errors introduced by communication link status fluctuations, instrument measurement uncertainties, and the randomness of cancellation algorithm convergence in a single measurement, ensuring the rigor and objectivity of the test evaluation.

[0071] The method of this application embodiment monitors the output power of the radio frequency signal generator when the communication system reaches the same preset performance threshold value in both the bypass state and the cancellation state of the communication interference cancellation device. The difference in output power between the two functional states is used as the quantitative test result of the improvement of the second anti-interference tolerance. This overcomes the defect of the prior art that cannot directly quantify and evaluate the actual improvement of the anti-interference capability of the communication link in the interference scenario through a unified communication system performance threshold. Only general testing instruments such as monitoring instruments are needed to achieve accurate and repeatable quantitative testing of the improvement index of the second anti-interference tolerance in a standardized testing scenario. This provides a reliable test basis for the objective evaluation and optimization design of the anti-interference performance of the communication interference cancellation device.

[0072] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the anti-interference processing time, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. Record the first moment when the interference signal appears and the second moment when the communication interference cancellation device outputs a valid communication signal under the action of the interference signal using an oscilloscope. Determine the first time difference between the second time point and the first time point, and use the first time difference as the quantitative test result of the anti-interference processing time; the general test instruments include an oscilloscope; or, When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. By setting the zero-sweep mode of the spectrum analyzer, and using the intermediate frequency output or video trigger function of the spectrum analyzer, the third moment when the interference signal appears and the fourth moment when the power amplitude of the communication signal output by the communication interference cancellation device converges under the action of the interference signal are recorded simultaneously. The second time difference between the fourth and third time points is determined, and this second time difference is used as the quantitative test result of the anti-interference processing time; the general test instruments include a spectrum analyzer.

[0073] Specifically, in the embodiments of this application, when the performance indicator to be tested is the anti-interference processing time, step S1 establishes a corresponding test scenario according to the test requirements of this indicator. The anti-interference processing time is used to evaluate the time required for the communication interference cancellation device to reach a stable convergence state from the appearance of the interference signal to the cancellation output, reflecting the response speed of the cancellation algorithm and the hardware cancellation link. A communication link is established between the two sets of communication devices and put into normal communication state. The communication interference cancellation device is connected to the communication link and switched to cancellation state. The communication interference cancellation device starts its cancellation algorithm and hardware cancellation link, and is in normal anti-interference working state. The output terminal of the radio frequency signal generator is connected to the interference signal input channel of the communication interference cancellation device to simulate the injection of interference signals.

[0074] Depending on the type of general-purpose testing instrument selected, time-domain or frequency-domain testing scenarios are built respectively. For example... Figure 5 In the time-domain test scenario shown, when an oscilloscope is used as a general-purpose test instrument, communication device 7 and communication device 8 establish a communication link through communication antennas 701 and 801 and are in normal communication state. The interference signal output terminal of the RF signal generator 1 serves as a reference signal, connected to the first channel of the oscilloscope 11 via power divider 102, and transmitted through interference antenna 101 to interfere with the communication link. The RF antenna port of communication device 8 is connected to the communication signal output port of the cancellation device 3. The communication signal output port of communication device 8 outputs two signals through power divider 12, one input to the interference signal coupling terminal of the cancellation device 3, and the other input to the second channel of the oscilloscope 11, used to acquire the time-domain waveform of the communication signal output by the cancellation device 3. Figure 6 In the frequency domain test scenario shown, when a spectrum analyzer is used as a general test instrument, communication device 7 and communication device 8 establish a communication link through communication antenna 701 and communication antenna 801 and are in normal communication state. The receiving end of communication device 7 is connected to monitoring instrument 9, and communication device 8 is connected to monitoring instrument 10. The clock signal of RF signal generator 1 is used as a trigger signal to connect to the first channel of spectrum analyzer 4. The RF antenna port of communication device 8 is connected to the communication signal output port of cancellation device 3. The communication signal output port of communication device 8 outputs two signals through power divider 12, which are respectively connected to the interference signal coupling port of cancellation device 3 and the second channel of spectrum analyzer 4; the test scenario is now complete.

[0075] In the aforementioned time-domain test scenario, in step S2, the communication interference cancellation device is switched to cancellation state, and the radio frequency signal generator is controlled to output an interference signal. The interference signal is injected into the communication interference cancellation device through the interference signal input channel, triggering the cancellation device to start the cancellation process. The oscilloscope acquires and records the moment when the interference signal appears in real time through the first channel, i.e., the first moment; the oscilloscope simultaneously acquires the time-domain waveform of the communication signal output port of the cancellation device through the second channel, observes and records the moment when the effective communication signal is output by the communication interference cancellation device under the continuous action of the interference signal, i.e., the second moment. Here, the effective communication signal refers to the signal amplitude at the communication signal output port that tends to stabilize after cancellation processing and no longer fluctuates significantly, indicating that the cancellation algorithm has completed convergence and reached a stable cancellation suppression state.

[0076] Furthermore, the time difference between the second moment and the first moment, i.e., the first time difference, is calculated and used as the quantitative test result of the anti-interference processing time in this test. This time difference directly characterizes the complete processing delay experienced by the communication interference cancellation device from the sudden appearance of the interference signal to the cancellation output reaching a stable and effective communication state, objectively quantifying the dynamic response speed of the cancellation device.

[0077] In the embodiments of this application, under the aforementioned frequency domain test scenario, in step S2, the cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output an interference signal. The interference signal is injected into the cancellation device through the interference signal input channel. The spectrum analyzer is set to zero-sweep mode, so that the spectrum analyzer is fixed at the frequency point to be tested to continuously acquire the signal power in the time domain. The intermediate frequency output or video trigger function of the spectrum analyzer is used to realize the synchronous capture and recording of the moment when the interference signal appears and the process of the change in the power amplitude of the communication signal. The spectrum analyzer simultaneously records the moment when the interference signal appears, i.e., the third moment; and the moment when the power amplitude of the communication signal output by the communication interference cancellation device converges to a stable state under the continuous action of the interference signal, i.e., the fourth moment. Here, the convergence of the communication signal power amplitude means that the communication signal output power amplitude observed by the spectrum analyzer in zero-sweep mode tends to be stable after the initial fluctuation, indicating that the cancellation algorithm has completed adaptive convergence and achieved a stable cancellation suppression effect.

[0078] Furthermore, the time difference between the fourth and third moments, i.e., the second time difference, is calculated and used as the quantitative test result of the interference suppression time in this test. Compared with the time-domain test method, the frequency-domain test method utilizes the zero-sweep mode and intermediate frequency output or video trigger function of the spectrum analyzer to simultaneously observe and record the moment when the interference signal appears and the moment when the communication signal power amplitude converges on a single instrument. This method is suitable for test scenarios where the canceling signal output port is an RF or intermediate frequency interface.

[0079] In the embodiments of this application, in both the time-domain and frequency-domain test scenarios, steps S1 to S2 can be repeatedly executed in step S3. By changing the test conditions such as the pattern, frequency, and working mode of the interference signal, the corresponding time difference is obtained under various combinations of test conditions. The results of multiple quantization tests are statistically analyzed, and the maximum value of the multiple measurement results is taken as the final test result of the anti-interference processing time of the cancellation device. This eliminates the random errors introduced by the convergence randomness of the cancellation algorithm, the uncertainty of the instrument triggering timing, and the fluctuation of environmental noise in a single measurement, thus ensuring the rigor and objectivity of the test evaluation.

[0080] The method in this application provides two testing methods for the anti-interference processing time of a communication interference cancellation device, namely time domain and frequency domain, based on the specific working mechanism of the device. The time domain method uses a dual-channel oscilloscope to synchronously capture the moment when the interference signal appears and the moment when the communication signal recovers and stabilizes. The frequency domain method uses a spectrum analyzer in zero-sweep mode combined with intermediate frequency output or video triggering function to synchronously record the two key moments. Both methods objectively quantify the dynamic response speed of the cancellation device by calculating the time difference between the two moments. This overcomes the deficiency of existing technologies that cannot directly quantify and evaluate the processing time required for the communication interference cancellation device from the appearance of the interference signal to the stable convergence of the cancellation output. Only general-purpose test instruments such as oscilloscopes or spectrum analyzers are needed to achieve accurate and repeatable quantitative testing of the anti-interference processing time index in a standardized test scenario. This provides a reliable test basis for the objective evaluation and optimization design of the dynamic response performance of the communication interference cancellation device.

[0081] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the delay in receiving interference-resistant signals, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is set to the cancellation state, and the control signal generator outputs the interference signal. By setting the zero-sweep mode using a spectrum analyzer, the first moment of interference signal input and the second moment of effective communication signal output by the communication interference cancellation device are recorded using the spectrum analyzer. Determine the time difference between the second moment and the first moment, and use the time difference as the quantitative test result of the anti-interference signal reception delay.

[0082] Specifically, in the embodiments of this application, when the performance indicator to be tested is the delay in receiving interference-resistant signals, step S1 involves constructing a corresponding test scenario based on the test requirements of this indicator, and the test circuit can be configured according to... Figure 6The test circuit structure shown is implemented. The anti-interference signal reception delay is used to evaluate the phase delay introduced by the communication interference cancellation device to the communication signal during cancellation operation. That is, the time difference between the test signal being input to the communication interference cancellation device and the stable output after cancellation processing, reflecting the impact of the cancellation processing stage on the communication signal transmission delay. A communication link is established between the two sets of communication equipment and put into normal communication mode, referring to the above... Figure 6 The circuit connections shown establish the wiring between the communication equipment, RF signal generator, and cancellation device. The spectrum analyzer is responsible for acquiring the test data. The cancellation device operates normally after power-on, and the test scenario is now complete.

[0083] In the embodiments of this application, in step S2, under the above-mentioned test scenario, the cancellation device is set to cancellation state, and the communication interference cancellation device activates its cancellation algorithm and hardware cancellation link, and is in normal anti-interference working state. The RF signal generator is controlled to output a test signal, which is injected into the communication interference cancellation device through the signal input port and enters the cancellation processing link. The spectrum analyzer is set to zero-sweep mode, so that the spectrum analyzer is fixed at the frequency point to be tested and continuously acquires the signal power amplitude in the time domain without frequency scanning, thereby enabling continuous observation of the change process of signal power amplitude over time in the time domain. The intermediate frequency output or trigger function of the spectrum analyzer is used to achieve synchronous capture and recording of the test signal input time and the stable output signal time of the communication interference cancellation device. The spectrum analyzer records the time when the test signal is input to the cancellation device, i.e., the first moment. The first moment refers to the moment when the test signal output by the signal generator enters the input port of the communication interference cancellation device, representing the starting time reference of the cancellation process.

[0084] Simultaneously, the spectrum analyzer records the moment when the communication signal output port of the cancellation device outputs a valid communication signal and reaches a stable state, i.e., the second moment. Here, the second moment refers to the moment when the power amplitude of the communication signal after cancellation processing at the output port tends to stabilize and no longer fluctuates significantly, indicating that the test signal has completely passed through the cancellation processing link and is output stably, representing the time reference for the completion of the cancellation processing process.

[0085] It is understandable that the test data in the functional state of the cancellation device at this time includes the aforementioned first and second moments. According to a preset calculation method, the time difference between the second and first moments is determined, and this time difference is used as the quantitative test result of the anti-interference signal reception delay. This time difference directly characterizes the total processing delay introduced by the cancellation device in the cancellation working state, from the input to the stable output of the communication signal, objectively quantifying the actual impact of the cancellation processing stage on the communication signal transmission delay.

[0086] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By changing the test conditions such as the frequency and power of the test signal and the working parameters of the communication interference cancellation device, the time difference between the first moment and the second moment is obtained under various combinations of test conditions. The results of multiple quantization tests are statistically analyzed, and the maximum value of multiple measurement results is taken as the final test result of the anti-interference signal reception delay. This eliminates the random errors introduced by the uncertainty of the spectrum analyzer triggering timing, the randomness of the cancellation algorithm convergence, and the fluctuation of environmental noise in a single measurement, thus ensuring the rigor and objectivity of the test evaluation.

[0087] The method in this application embodiment sets the communication interference cancellation device to a cancellation state and uses the zero-sweep mode of a spectrum analyzer combined with intermediate frequency output or triggering function to synchronously record the first moment when the test signal is input to the communication interference cancellation device and the second moment when the communication signal is stably output. The time difference between the two is used as the quantitative test result of the anti-interference signal reception delay. This overcomes the defect of the prior art that cannot directly quantify and evaluate the communication signal transmission delay introduced by the cancellation processing of the communication interference cancellation device. Only general testing instruments such as a spectrum analyzer are needed to achieve accurate and repeatable quantitative testing of the anti-interference signal reception delay index in a standardized testing scenario. This provides a reliable test basis for the objective evaluation and optimization design of the signal transmission delay performance of the communication interference cancellation device.

[0088] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the anti-self-interference processing time, and S2 includes: After switching the communication interference cancellation device to bypass mode, control the radio frequency signal generator to output the interference signal; The power time-domain response process of the interference signal is captured using a spectrum analyzer, and the time-domain waveforms of the maximum interference signal power and the first signal power of the interference signal in the bypass state are recorded. The radio frequency signal generator is then turned off. Switch the communication interference cancellation device from the bypass state to the cancellation state, control the radio frequency signal generator to output the interference signal again, and make the interference signal gradually reach the maximum interference signal power. Record the second signal power time domain waveform of the interference signal in the current cancellation state through the spectrum analyzer. The time-domain waveforms of the first signal power and the second signal power are compared and analyzed to determine the transition time from zero to convergence of the anti-interference tolerance improvement, and the transition time is used as the quantitative test result of the anti-interference processing time; the general test instruments include a spectrum analyzer.

[0089] Specifically, in the embodiments of this application, when the performance indicator to be tested is the self-interference handling time, step S1 constructs a corresponding test scenario according to the test requirements of this indicator. The self-interference handling time is used to evaluate the time required for the communication interference cancellation device to reach a stable convergence state from the appearance of the self-interference signal, reflecting the dynamic response speed of the cancellation algorithm and hardware cancellation link to the self-interference signal. The constructed test circuit structure can be based on… Figure 2 The circuit structure shown connects the output of the RF signal generator 1 to the interference signal input port of the cancellation device 3 to generate a controlled fixed-frequency interference signal to simulate a self-interference scenario. The communication signal output port of the cancellation device 3 is connected to the RF input port of the spectrum analyzer 4, which then performs the power time-domain waveform acquisition function. The input of the coupler 5 is connected to the interference signal coupling terminal of the cancellation device 3, and the output of the coupler 5 is connected to the communication port of the cancellation device 3 to simulate a self-interference signal. After debugging the RF signal generator 1, setting the transmission frequency, operating mode, and power, and temporarily shutting down the output of the RF signal generator 1, the cancellation device 3 is powered on and in normal working condition, thus completing the test scenario setup.

[0090] In the embodiments of this application, in step S2, under the above test scenario, the first signal power time-domain waveform and the second signal power time-domain waveform are obtained respectively according to the following steps, and the anti-self-interference processing time is determined by comparison and analysis.

[0091] First, the cancellation device is switched to bypass mode, and the cancellation channel inside the cancellation chassis is either directly connected or closed. The interference signal is transmitted directly to the communication signal output port without any cancellation processing. The RF signal generator is controlled to output the interference signal, and the spectrum analyzer is set to time-domain triggered mode or zero-bandwidth mode, with a resolution bandwidth (RBW) of 100kHz or higher. The spectrum analyzer is fixed at the frequency to be measured to continuously acquire the signal power amplitude in the time domain without frequency scanning, thus enabling continuous observation of the change in interference signal power over time. The spectrum analyzer can capture the time-domain response of the interference signal power, recording the maximum interference signal power in bypass mode and the corresponding first signal power time-domain waveform. Here, the first signal power time-domain waveform reflects the baseline state of the interference signal power change over time at the communication signal output port when the communication interference cancellation device is not activated. Its maximum amplitude value is the power reference benchmark that the interference signal needs to reach in subsequent cancellation state tests. After recording is complete, turn off the output of the RF signal generator to restore the test link to an interference-free state, providing consistent initial conditions for subsequent tests in the cancellation state.

[0092] Subsequently, the communication interference cancellation device was switched from bypass mode to cancellation mode. The device activated its cancellation algorithm and hardware cancellation link, entering normal anti-interference operation. The RF signal generator was then controlled to output the interference signal again, and the output power was increased to gradually raise the interference signal power to the maximum recorded interference signal power, ensuring that the interference signal power level injected into the cancellation device was consistent in both tests. The spectrum analyzer, under the same time-domain trigger mode or zero-bandwidth mode, captured and recorded the power time-domain response process of the interference signal at the communication signal output port in the cancellation state, thus obtaining the second signal power time-domain waveform. Here, the second signal power time-domain waveform reflects the complete dynamic process of the cancellation algorithm responding from the initial state and gradually converging to a stable cancellation state after the communication interference cancellation device activates its cancellation function. The trajectory of its amplitude change over time reflects the convergence characteristics of the cancellation algorithm.

[0093] Understandably, the test data under the functional state of the cancellation device at this time includes the aforementioned first signal power time-domain waveform and second signal power time-domain waveform. According to the preset calculation method, the first signal power time-domain waveform and the second signal power time-domain waveform are compared and analyzed, and the power difference between the two time-domain waveforms is calculated moment by moment to obtain a dynamic curve showing the change in anti-interference tolerance improvement over time. Therefore, in this dynamic curve, the transition time from zero to a stable threshold for the anti-interference tolerance improvement can be determined, and this transition time is used as the quantitative test result of the anti-interference processing time in this test. The transition time refers to the time interval during which the anti-interference tolerance improvement rises from its initial zero value at the time of interference signal injection to a preset convergence threshold (typically 10 dB to 80 dB) and remains stable, directly characterizing the complete dynamic response delay of the cancellation device from the appearance of interference to the stable establishment of the cancellation effect.

[0094] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By changing the test conditions such as the frequency and power of the interference signal and the working parameters of the communication interference cancellation device, the time-domain waveforms of the first signal power and the second signal power are obtained at multiple test frequency points, and the transition time of each frequency point is determined. The results of multiple quantization tests are statistically analyzed, and the maximum value of multiple measurement results is taken as the final test result of the anti-self-interference processing time of the communication interference cancellation device. This eliminates the random errors introduced by the convergence randomness of the cancellation algorithm, the uncertainty of the triggering timing of the spectrum analyzer, and the fluctuation of environmental noise in a single measurement, thus ensuring the rigor and objectivity of the test evaluation.

[0095] The method in this application embodiment switches the communication interference cancellation device to bypass and cancellation states respectively. It uses the time-domain trigger mode or zero-bandwidth mode of a spectrum analyzer to capture and record the power time-domain waveforms of the interference signal in the two functional states respectively. By comparing and analyzing the dynamic curves of the power difference between the two time-domain waveforms at each moment, the transition time from zero to convergence of the anti-interference tolerance improvement is determined as the quantitative test result of the anti-interference processing time. This overcomes the defect of the prior art that cannot directly quantify and evaluate the dynamic convergence response time of the communication interference cancellation device's cancellation algorithm. Only general-purpose test instruments such as a spectrum analyzer are needed to achieve accurate and repeatable quantitative testing of the anti-interference processing time index in a standardized test scenario. This provides a reliable test basis for the objective evaluation and optimization design of the dynamic response performance of the communication interference cancellation device.

[0096] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the anti-self-interference synchronization cancellation bandwidth, and S2 includes: Control two radio frequency signal generators to output a first interference signal at a first frequency and a second interference signal at a second frequency; The communication interference cancellation device is switched to bypass mode and cancellation mode respectively. The first power of the first interference signal and the second power of the second interference signal in bypass mode are measured by spectrum analyzer, and the third power of the first interference signal and the fourth power of the second interference signal in cancellation mode are measured. If the first difference between the first power and the third power and the second difference between the second power and the fourth power are both greater than the preset threshold, the second frequency is gradually changed until either the first difference or the second difference is less than the preset threshold. The current test is then stopped, and the maximum frequency bandwidth that satisfies both the first difference and the second difference being greater than the preset threshold is determined. The maximum frequency bandwidth is used as the quantitative test result of the anti-self-interference synchronization cancellation bandwidth; general test instruments include a spectrum analyzer.

[0097] Specifically, in the embodiments of this application, when the performance index to be tested is the anti-self-interference synchronization cancellation bandwidth, step S1 establishes a corresponding test scenario according to the test requirements of this index. The anti-self-interference synchronization cancellation bandwidth is used to evaluate the maximum bandwidth range that the communication interference cancellation device can simultaneously cancel; that is, under the premise of meeting a preset cancellation effect threshold, the maximum frequency coverage range corresponding to when the cancellation device can effectively suppress two interference signals with continuously expanding frequency intervals simultaneously. To simulate a dual-frequency self-interference scenario under controlled conditions, such as... Figure 7The test circuit structure shown employs two radio frequency (RF) signal generators (RF signal generator 1 and RF signal generator 13) to generate a first interference signal at a first frequency and a second interference signal at a second frequency, respectively. The two interference signals are combined using a combiner 14, amplified by a power amplifier 2, and then injected into the interference signal input channel of the cancellation device 3. The communication signal output port of the cancellation device 3 is connected to the RF input port of a spectrum analyzer 4, which measures the power of the interference signal at each frequency. The input of a coupler 5 is connected to the interference signal coupling terminal of the cancellation device 3, and its output is connected to the communication port of the cancellation device 3 to simulate self-interference signals. The isolation port of the coupler 5 is connected to a matching load 6 to absorb excess reflected signals from the coupler. After power-on, the cancellation device 3 operates normally, and the test scenario is complete.

[0098] In the embodiments of this application, in step S2, under the above-mentioned test scenario, two radio frequency signal generators are controlled to output a first interference signal at a first frequency and a second interference signal at a second frequency, respectively. The transmission frequency, operating mode, and power of each transmitting device are adjusted so that the dual-frequency interference signals are simultaneously injected into the cancellation device. The cancellation device is switched to bypass mode, and the cancellation channel inside the cancellation chassis is either directly open or closed. The dual-frequency interference signals are transmitted directly to the communication signal output port without any cancellation processing. The power of the first interference signal at the first frequency, i.e., the first power P1, and the power amplitude of the second interference signal at the second frequency, i.e., the second power P2, are measured and recorded using a spectrum analyzer in the bypass mode. The first power P1 and the second power P2 together constitute the power reference value of the dual-frequency interference signal without cancellation processing.

[0099] Subsequently, the communication interference cancellation device is switched to cancellation mode. The device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the injected dual-frequency interference signal. The power amplitude of the first interference signal at the first frequency f1 (i.e., the third power P3) and the power amplitude of the second interference signal at the second frequency f2 (i.e., the fourth power P4) are measured and recorded using a spectrum analyzer in the cancellation mode.

[0100] like Figure 8As shown, the dashed lines represent the power amplitude variation curves of the first interference signal at the first frequency f1 and the second interference signal at the second frequency f2 before cancellation, and the solid lines represent the power amplitude variation curves of the first interference signal at the first frequency f1 and the second interference signal at the second frequency f2 after cancellation. According to a preset calculation method, the difference between the first power P1 and the third power P3, i.e., the first difference (P1-P3), and the difference between the second power P2 and the fourth power P4, i.e., the second difference (P2-P4), are calculated. The first and second differences respectively characterize the actual cancellation depth of the cancellation device for their respective interference signals at the first frequency f1 and the second frequency f2, i.e., the tolerance increase; the interval between the first frequency f1 and the second frequency f2 characterizes the synchronous cancellation bandwidth.

[0101] Determine whether both the first difference (P1-P3) and the second difference (P2-P4) are greater than a preset threshold. Here, the preset threshold is a pre-set benchmark for judging the cancellation effect, used to objectively determine whether the cancellation effect of the cancellation device under the current dual-frequency combination meets the specified requirements. If both (P1-P3) and (P2-P4) are greater than the preset threshold, it indicates that the cancellation device can effectively suppress two interference signals simultaneously under the current combination of the first frequency f1 and the second frequency f2, meeting the cancellation effect requirements. At this time, gradually change the second frequency f2, so that the second frequency f2 gradually moves away from the first frequency f1 by a preset frequency step, expanding the frequency interval between the two interference signals, and repeat the above-mentioned bypass state and cancellation state switching measurement process at each new second frequency f2, recalculate the first difference (P1-P3) and the second difference (P2-P4), and continuously determine whether both are greater than the preset threshold. As the frequency interval between the second frequency f2 and the first frequency f1 continues to expand, the synchronous cancellation capability of the cancellation device for dual-frequency interference signals will gradually approach its bandwidth limit. When either the first difference (P1-P3) or the second difference (P2-P4) is less than the preset threshold for the first time, the test at the current frequency point will stop, indicating that the cancellation device can no longer meet the cancellation effect requirements at both frequencies simultaneously.

[0102] Before stopping the test, determine the synchronization cancellation bandwidth corresponding to the condition that the first difference (P1-P3) and the second difference (P2-P4) are both greater than the preset threshold. The maximum frequency bandwidth BW = |f1-f2| is obtained, which is the maximum value of the frequency interval between the first frequency f1 and the second frequency f2. The maximum frequency bandwidth BW is used as the quantitative test result of the anti-self-interference synchronization cancellation bandwidth at the current test frequency.

[0103] In the embodiments of this application, in step S3, steps S1 to S2 are repeated, the first frequency f1 is changed, and the above measurement process is repeated under multiple fixed values ​​of the first frequency f1. The corresponding maximum frequency bandwidth BW is determined at each first frequency f1. The results of multiple quantitative tests are statistically analyzed, and the minimum value of the maximum frequency bandwidth among all test frequency points is taken as the final test result of the anti-self-interference synchronous cancellation bandwidth of the communication interference cancellation device. This comprehensively evaluates the synchronous cancellation bandwidth performance of the cancellation device under different operating frequency points, ensuring the rigor and objectivity of the test evaluation.

[0104] The method in this application embodiment generates dual-frequency interference signals using two radio frequency signal generators. A spectrum analyzer is used to measure the interference signal power at each frequency point in both bypass and cancellation states. The maximum frequency bandwidth corresponding to the power difference at each frequency point meeting a preset threshold in both functional states is used as the quantitative test result of the anti-self-interference synchronous cancellation bandwidth. This overcomes the deficiency of existing technologies that cannot directly quantify and evaluate the maximum bandwidth range of multiple frequency interference signals simultaneously cancelled by a communication interference cancellation device. Only general-purpose testing instruments such as a spectrum analyzer are needed to achieve accurate and repeatable quantitative testing of the anti-self-interference synchronous cancellation bandwidth index in a standardized testing scenario. This provides a reliable test basis for the objective evaluation and optimized design of the broadband synchronous cancellation performance of communication interference cancellation devices.

[0105] Based on the above embodiments, as an optional embodiment, the performance index to be tested is the minimum interference frequency spacing against self-interference, and S2 includes: The frequency and power of the communication signal output by the first radio frequency signal generator are fixed, and the power of the interference signal output by the second radio frequency signal generator is fixed. Adjust the frequency of the interference signal, switch the communication interference cancellation device to bypass state and cancellation state respectively, and measure the first power of the communication signal in bypass state and the second power in cancellation state, as well as the frequency of the interference signal in cancellation state, using a spectrum analyzer. Based on the second power and the first power, determine the attenuation power of the communication signals before and after cancellation; When the attenuation power is less than a preset fixed threshold, the frequency interval between the current communication signal and the interference signal is determined, and the frequency interval is used as the quantitative test result of the minimum interference frequency interval for anti-self-interference; general test instruments include a spectrum analyzer.

[0106] Specifically, in the embodiments of this application, when the performance index to be tested is the minimum self-interference interference frequency interval, step S1 establishes a corresponding test scenario according to the test requirements of this index. The minimum self-interference interference frequency interval is used to evaluate the minimum frequency interval at which the cancellation device does not substantially affect the useful communication signal when canceling interference signals, that is, the minimum allowable value of the frequency interval between the interference signal and the communication signal under the premise that the communication signal attenuation does not exceed a preset fixed threshold. In this test, such as Figure 9 The test circuit structure shown employs RF signal generator 1 and RF signal generator 13 as the communication signal source and interference signal source, respectively. The output of RF signal generator 1 is connected to the communication signal input channel of cancellation device 3 via power amplifier 2 to generate a controlled useful communication signal. RF signal generator 13 outputs a communication signal to attenuator 15. The input of coupler 5 is connected to the interference signal coupling terminal of cancellation device 3, and the output of coupler 5 is connected to the first input channel of combiner 14. The second input channel of combiner 14 is connected to attenuator 15. Combiner 14 combines the two signals and outputs them to cancellation device 3. The communication signal output port of cancellation device 3 is connected to the RF input port of spectrum analyzer 4, which measures the communication signal power. After power-on, cancellation device 3 is in normal working condition, and the test scenario is complete.

[0107] In the embodiments of this application, in step S2, under the above test scenario, the frequency and power of the communication signal output by the first radio frequency signal generator are fixed so that the frequency and power of the communication signal remain unchanged throughout the test process, serving as a stable useful signal reference; the power of the interference signal output by the second radio frequency signal generator is fixed so that the power of the interference signal remains unchanged throughout the test process, and only the frequency of the interference signal is adjusted to change the frequency interval between the interference signal and the communication signal.

[0108] With the current interference signal frequency setting, the communication interference cancellation device is switched to bypass mode. The cancellation channel inside the cancellation chassis is either directly connected or closed, and both the communication signal and the interference signal are transmitted directly to the communication signal output port without any cancellation processing. The power amplitude of the communication signal in bypass mode is measured and recorded at the communication signal frequency using a spectrum analyzer; this is known as the first power. The first power reflects the reference power level of the communication signal at the output port when the cancellation function is not activated, representing the reference power value of the communication signal before it is affected by cancellation processing.

[0109] Subsequently, the communication interference cancellation device is switched to cancellation mode. The device activates its cancellation algorithm and hardware cancellation link to sample, reconstruct, and cancel the injected interference signal. A spectrum analyzer is used to measure and record the power amplitude of the communication signal in the cancellation state at the same communication signal frequency; this is the second power. Simultaneously, the frequency of the interference signal in the current cancellation state is also recorded. The second power reflects the power level of the communication signal transmitted to the output port via the cancellation processing link after the communication interference cancellation device activates its cancellation function. Because the cancellation algorithm may attenuate the power of communication signals with frequencies close to the interference signal while suppressing the interference signal, the second power may be lower than the first power.

[0110] According to a preset calculation method, the attenuation power of the communication signal before and after cancellation is determined based on the first power and the second power. The attenuation power is the difference between the first power and the second power, which directly characterizes the degree of power loss caused to the communication signal by the cancellation process.

[0111] Further, it is determined whether the attenuation power is less than a preset fixed threshold, such as 2dB. The preset fixed threshold is a pre-set upper limit for communication signal attenuation tolerance, used to objectively determine whether the impact of the cancellation device on the communication signal under the current interference signal frequency setting is within an acceptable range. When the attenuation power is less than the preset fixed threshold, it indicates that the power loss caused by the cancellation process on the communication signal under the current frequency interval between the interference signal and the communication signal is within an acceptable range, and the communication signal quality is not substantially affected. At this point, the frequency interval between the current communication signal frequency and the interference signal frequency is determined, and this frequency interval is used as the quantitative test result of the minimum interference frequency interval for resisting self-interference under the condition that the attenuation power is less than the preset fixed threshold.

[0112] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By gradually adjusting the frequency of the interference signal, the frequency interval between the interference signal and the communication signal is reduced. Under each frequency interval setting, the above-mentioned switching measurement process between bypass state and cancellation state is repeated, and the corresponding attenuation power is calculated respectively. The minimum frequency interval that satisfies the condition that the attenuation power is less than a preset fixed threshold is continuously searched. At the same time, the operating frequency of the communication signal is changed, and the above measurement process is repeated at multiple communication signal frequency points. The results of multiple quantitative tests are statistically analyzed, and the minimum frequency interval that satisfies the condition that the attenuation power is less than the preset fixed threshold under all test conditions is taken as the final test result of the minimum interference frequency interval of the communication interference cancellation device. This comprehensively evaluates the frequency selectivity effect of the cancellation device on the communication signal under different operating frequencies, ensuring the rigor and objectivity of the test evaluation.

[0113] The method in this application embodiment fixes the frequency and power of the communication signal and the power of the interference signal, adjusts only the frequency of the interference signal, and uses a spectrum analyzer to measure the power of the communication signal in both bypass and cancellation states. The frequency interval between the communication signal and the interference signal when the power attenuation of the communication signal before and after cancellation is less than a preset fixed threshold is used as the quantitative test result of the minimum interference frequency interval against self-interference. This overcomes the deficiency of existing technologies that cannot directly quantify and evaluate the minimum frequency interval when the cancellation process of the communication interference cancellation device has a substantial impact on the useful communication signal. Only general-purpose testing instruments such as a spectrum analyzer are needed to achieve accurate and repeatable quantitative testing of the minimum interference frequency interval against self-interference in a standardized testing scenario, providing a reliable test basis for the objective evaluation and optimization design of the frequency selectivity performance of the communication interference cancellation device.

[0114] Based on the above embodiments, as an optional embodiment, the performance indicator to be tested is the intermediate frequency access insertion loss, and S2 includes: Switch the communication interference cancellation device to bypass mode and control the vector network analyzer to measure the insertion loss value between the signal input port and the signal output port within the operating frequency band. The maximum value of the insertion loss within the operating frequency band is determined, and this maximum value is used as the quantitative test result of the intermediate frequency access insertion loss. The general test instruments include a vector network analyzer, and the two test ports of the vector network analyzer are respectively connected to the signal input port and signal output port of the communication interference cancellation device.

[0115] Specifically, in the embodiments of this application, when the performance indicator to be tested is intermediate frequency (IF) access insertion loss, step S1 establishes a corresponding test scenario based on the test requirements of this indicator. IF access insertion loss is used to quantify the power loss of the received signal caused by the communication interference cancellation device after it is embedded in the communication link, reflecting the degree of influence of the IF channel of the cancellation device on the transmission of the communication signal. For example... Figure 10 The test circuit structure shown connects the two test ports of the vector network analyzer 16 to the signal input and signal output ports of the cancellation chassis in the cancellation device 3, respectively. The vector network analyzer 16 is responsible for measuring the insertion loss value within the operating frequency band. Ensure that all RF cable connections are secure. After preheating and self-calibration, the test instrument is in normal working condition, and the test scenario setup is complete.

[0116] In the embodiments of this application, in step S2, under the above-mentioned test scenario, the communication interference cancellation device is switched to bypass mode. The cancellation processing channel inside the communication interference cancellation device is either directly connected or closed. The communication signal is transmitted directly from the signal input port to the signal output port via the intermediate frequency channel without any cancellation processing. The reason for choosing the bypass mode for testing is that the intermediate frequency access insertion loss reflects the inherent loss of signal power after the cancellation device is embedded in the communication link as a passive intermediate frequency channel. It is unrelated to whether the cancellation algorithm is activated. The bypass mode can eliminate the additional impact of cancellation processing on signal power and accurately characterize the insertion loss characteristics of the intermediate frequency channel itself.

[0117] In bypass mode, the control vector network analyzer performs frequency sweep measurements on the transmission characteristics between the signal input and output ports within the operating frequency band of the communication interference cancellation device. It measures and records the power loss of the signal during transmission from the input port to the output port point by point, obtaining the insertion loss value at each frequency point within the operating frequency band. The insertion loss value reflects the degree of power attenuation of the communication signal caused by the intermediate frequency channel of the communication interference cancellation device at the corresponding frequency point; a larger value indicates a greater power loss of the communication signal by the intermediate frequency channel at that frequency point.

[0118] Understandably, the test data under the functional state of the cancellation device at this time is the set of insertion loss values ​​at various frequency points within the aforementioned operating frequency band. According to the preset calculation method, the maximum value is determined among all the insertion loss values ​​measured at all frequency points within the operating frequency band, and this maximum value is used as the quantitative test result of the intermediate frequency (IF) access insertion loss. Taking the maximum insertion loss within the operating frequency band as the quantitative result is because the maximum IF access insertion loss represents the maximum power loss to the communication signal at the most unfavorable frequency point after the cancellation device is embedded in the communication link. This objectively reflects the worst-case impact of the cancellation device on the signal transmission quality of the communication link, providing a conservative and reliable basis for the link budget and performance evaluation of the communication system.

[0119] In the embodiments of this application, in step S3, steps S1 to S2 are repeated. By repeatedly executing the above frequency sweep measurement process under the same test scenario, the maximum insertion loss values ​​of multiple sets of working frequency bands are statistically analyzed to obtain the final test result of intermediate frequency access insertion loss with high confidence and repeatability. This eliminates the random errors introduced by the measurement uncertainty of the vector network analyzer, the fluctuation of the RF cable connection status and the change of ambient temperature in a single measurement, and ensures the rigor and objectivity of the test evaluation.

[0120] The method in this application, by switching the communication interference cancellation device to bypass mode, uses a vector network analyzer to perform frequency sweep measurements between the signal input port and the signal output port within the operating frequency band. The maximum value of the insertion loss within the operating frequency band is used as the quantitative test result of the intermediate frequency access insertion loss. This overcomes the deficiency of existing technologies that cannot directly quantify and evaluate the intermediate frequency channel power loss caused by the communication interference cancellation device after being embedded in the communication link. Only general-purpose test instruments such as vector network analyzers are needed to achieve accurate and repeatable quantitative testing of the intermediate frequency access insertion loss index in a standardized test scenario. This method is also applicable to both self-interference and external interference cancellation devices, providing a reliable test basis for the objective evaluation and optimization design of the intermediate frequency channel transmission performance of the communication interference cancellation device.

[0121] Optionally, this application also provides a method for testing the G / T value of an auxiliary antenna, applicable to the receiving performance testing of active antennas not aligned with cold air. The auxiliary antenna G / T value is used to evaluate the ability of an active auxiliary antenna in a communication interference cancellation device to receive interference signals. The G / T value comprehensively reflects the ratio of the auxiliary antenna's gain to the system noise temperature, and is a core performance indicator characterizing the receiving sensitivity of the active antenna. For communication anti-interference scenarios, the main beam of the active auxiliary antenna is oriented near the horizontal plane rather than towards cold air. Its operating scenario differs fundamentally from the traditional satellite communication antenna G / T value testing scenario; therefore, a testing method based on free-space loss calculation is adopted.

[0122] Furthermore, it can be done according to Figure 11 The test circuit shown establishes a test scenario for the auxiliary antenna's G / T value. Signal source 17 is connected to standard horn antenna 18 via an RF cable. Standard horn antenna 18 and the auxiliary antenna of cancellation device 3 are placed opposite each other, with their main beam directions aligned to ensure the signal radiated by standard horn antenna 18 can be effectively received by the auxiliary antenna. Spectrum analyzer 4 is connected to the output port of the auxiliary antenna via an RF cable, and the spectrum analyzer is responsible for measuring the received power and background noise power. The spatial distance between the standard horn antenna and the auxiliary antenna is measured and recorded, as is the RF cable loss between the signal source output and the standard horn antenna input. Cancellation device 3 operates normally after power-on, and the test scenario is complete.

[0123] In the embodiments of this application, under the above test scenario, the test data are obtained sequentially according to the following steps: First, the signal source is placed opposite the auxiliary antenna of the cancellation device through a standard horn antenna, and the spectrum analyzer is connected to the auxiliary antenna; the signal source is turned on, the output power of the signal source is recorded, and the received power of the spectrum analyzer is recorded; the signal source is turned off, the background noise power of the spectrum analyzer is recorded, and the G / T value of the auxiliary antenna is determined based on the distance between the standard horn antenna and the auxiliary antenna, the line loss between the signal source and the standard horn antenna, the received power of the spectrum analyzer, the output power of the signal source, the background noise power, the gain of the standard horn antenna, and the free space loss.

[0124] Therefore, the test data includes the output power P0 of the signal source, the received power P1 of the spectrum analyzer, the background noise power P2 of the spectrum analyzer when the signal source is turned off, and the distance D between the standard horn antenna and the auxiliary antenna, the line loss S1 between the signal source and the standard horn antenna, and the gain G0 of the standard horn antenna recorded during the test scenario setup phase. According to the preset calculation method, firstly, based on the distance D between the standard horn antenna and the auxiliary antenna and the output frequency of the signal source, the free space loss L1 between the standard horn antenna and the auxiliary antenna is calculated using the free space loss formula; then, the above test data are substituted into the following calculation formula to determine the G / T value of the auxiliary antenna: G / T=P1+S1-P0-G0+L1–P2-198.6; In the formula, -198.6 is an empirical constant.

[0125] The above calculation formula objectively quantifies the G / T value of the auxiliary antenna when receiving interference signals near the horizontal plane by comprehensively correcting the difference between the received power of the auxiliary antenna and the system noise power, combined with free space propagation path loss, standard horn antenna gain and line loss. It directly characterizes the sensitivity of the auxiliary antenna to receiving interference signals.

[0126] Optionally, embodiments of this application also provide a method for testing the anti-interference blind zone. Specifically, this can be referenced to the test scenario for improving the anti-interference tolerance index, and conducted according to... Figure 4 The test circuit shown establishes a blind zone test scenario for interference immunity. After debugging the communication link, the cancellation device 3 is set to anti-interference working state. The receiver of communication device 7 is connected to monitoring instrument 9, and communication device 8 is connected to monitoring instrument 10 via cancellation device 3. The radio frequency signal generator 1 is mounted on a rotatable antenna turntable. The communication signal power of the two communication devices and the interference signal power output by the radio frequency signal generator 1 are fixed. The turntable is controlled to change the direction angle of arrival of the interference signal. The bit error rate or signal-to-interference-plus-noise ratio of the communication system is monitored by two monitoring instruments. The range of the direction angle of arrival of the interference signal when the bit error rate or signal-to-interference-plus-noise ratio fails to reach the preset threshold is recorded. This angle range is used as the quantitative test result of the interference immunity blind zone.

[0127] It is understood that the various numerical designations used in the embodiments of this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application.

[0128] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0129] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0130] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A comprehensive testing method for a communication interference cancellation device, characterized in that, include: S1. Build a corresponding test scenario based on the performance indicators to be tested, connect the general test instrument with the communication interference cancellation device, and set the communication interference cancellation device to the working state. S2, under the test scenario, adjust the functional state of the communication interference cancellation device, collect test data under the functional state through the general test instrument, and determine the quantitative test result of the performance index to be tested according to the preset calculation method based on the test data under the functional state. The functional state includes at least one of bypass state and cancellation state; S3, repeat S1 to S2, and determine the final test result of the performance index to be tested based on the results of multiple quantitative tests; The performance indicators to be tested include at least one of the following: improved self-interference tolerance, improved external interference tolerance, external interference processing time, external interference signal reception delay, self-interference processing time, self-interference synchronization cancellation bandwidth, minimum interference frequency interval for self-interference, and intermediate frequency access insertion loss.

2. The comprehensive testing method according to claim 1, characterized in that, The performance indicator to be tested is the improvement in self-disruption tolerance, and S2 includes: When the signal emitted by the radio frequency signal generator is used as the test interference signal, the communication interference cancellation device is switched to bypass state and cancellation state respectively. The first power of the test interference signal at the current frequency point in the bypass state and the second power of the test interference signal at the current frequency point in the cancellation state are obtained by using a spectrum analyzer; the test data in the functional state includes the first power and the second power. The difference between the first power and the second power is determined, and the difference is used as the quantitative test result of the improvement in the anti-interference tolerance; the general-purpose test instrument includes the spectrum analyzer.

3. The comprehensive testing method according to claim 1, characterized in that, The performance index to be tested is the improvement of the first anti-interference tolerance, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is disconnected from the communication device it is connected to. After using a radio frequency signal generator to output an interference signal and switching the communication interference cancellation device to bypass mode, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the first interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using a spectrum analyzer. Reduce the power of the interference signal to eliminate the communication link anomaly; After connecting the communication interference cancellation device to the communication equipment and switching from the bypass state to the cancellation state, the power of the interference signal is gradually increased until the communication link begins to malfunction. The strength of the second interference signal at the auxiliary antenna of the communication interference cancellation device is then tested using the spectrum analyzer. The difference between the intensity of the first interference signal and the intensity of the second interference signal is used as the quantitative test result of the improvement of the first interference immunity tolerance; the improvement of interference immunity tolerance includes the improvement of the first interference immunity tolerance, and the general test instrument includes the spectrum analyzer.

4. The comprehensive testing method according to claim 1, characterized in that, The performance index to be tested is the improvement of the second anti-interference tolerance, and S2 includes: When communication links are established between communication devices, the communication interference cancellation device is switched to bypass mode, and the radio frequency signal generator outputs an interference signal to interfere with the communication link. The power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached a preset performance threshold value, and the first output power of the radio frequency signal generator is recorded. After removing the interference from the radio frequency signal generator, the communication interference cancellation device is switched from the bypass state to the cancellation state. The radio frequency signal generator is used again to output an interference signal to interfere with the communication link, and the power of the interference signal is adjusted until the monitoring instrument detects that the communication system has reached the preset performance threshold value. The second output power of the radio frequency signal generator is recorded at this time. The difference between the second output power and the first output power is used as the quantitative test result of the improvement in the second interference immunity tolerance; the improvement in interference immunity tolerance includes the improvement in the second interference immunity tolerance, and the general test instrument includes the monitoring instrument.

5. The comprehensive testing method according to claim 1, characterized in that, The performance index to be tested is the anti-interference processing time, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. The first moment when the interference signal appeared and the second moment when the communication interference cancellation device output a valid communication signal under the action of the interference signal were recorded using an oscilloscope. A first time difference is determined between the second time point and the first time point, and the first time difference is used as the quantitative test result of the anti-interference processing time; the general-purpose test instrument includes the oscilloscope; or, When establishing a communication link between communication devices, the communication interference cancellation device is switched to the cancellation state, and the radio frequency signal generator is controlled to output interference signals. By setting the zero-sweep mode using a spectrum analyzer, the spectrum analyzer simultaneously records the third moment when the interference signal appears and the fourth moment when the power amplitude of the communication signal output by the communication interference cancellation device converges under the action of the interference signal. A second time difference is determined between the fourth time point and the third time point, and the second time difference is used as the quantitative test result of the anti-interference processing time; the general-purpose test instrument includes the spectrum analyzer.

6. The comprehensive testing method according to claim 1, characterized in that, The performance indicator to be tested is the delay in receiving interference-resistant signals, and S2 includes: When establishing a communication link between communication devices, the communication interference cancellation device is set to cancellation state, and the signal generator is controlled to output an interference signal. The spectrum analyzer is set to zero-sweep mode, and the spectrum analyzer is used to record the first moment when the interference signal is input and the second moment when the communication interference cancellation device outputs a valid communication signal. The time difference between the second time point and the first time point is determined, and the time difference is used as the quantization test result of the anti-interference signal reception delay; the general test instrument includes the spectrum analyzer.

7. The comprehensive testing method according to claim 1, characterized in that, The performance index to be tested is the self-disturbance processing time, and S2 includes: After switching the communication interference cancellation device to bypass mode, the radio frequency signal generator is controlled to output an interference signal; The power time-domain response process of the interference signal is captured using a spectrum analyzer, and the time-domain waveforms of the maximum interference signal power and the first signal power of the interference signal in the bypass state are recorded. The radio frequency signal generator is then turned off. Switch the communication interference cancellation device from the bypass state to the cancellation state, control the radio frequency signal generator to output the interference signal again, and make the interference signal gradually reach the maximum interference signal power. Record the second signal power time-domain waveform of the interference signal in the current cancellation state through the spectrum analyzer. The time-domain waveforms of the first signal power and the second signal power are compared and analyzed to determine the transition time from zero to convergence of the self-interference tolerance improvement, and the transition time is used as the quantitative test result of the self-interference processing time; the general-purpose test instrument includes the spectrum analyzer.

8. The comprehensive testing method according to claim 1, characterized in that, The performance indicator to be tested is the self-disruption synchronization cancellation bandwidth, and S2 includes: Control two radio frequency signal generators to output a first interference signal at a first frequency and a second interference signal at a second frequency; The communication interference cancellation device is switched to bypass mode and cancellation mode respectively. The first power of the first interference signal and the second power of the second interference signal in bypass mode are measured by spectrum analyzer, and the third power of the first interference signal and the fourth power of the second interference signal in cancellation mode are measured by spectrum analyzer. When the first difference between the first power and the third power and the second difference between the second power and the fourth power are both greater than a preset threshold, the second frequency is gradually changed until the first difference or the second difference is less than the preset threshold, the current test is stopped, and the maximum frequency bandwidth that satisfies the first difference and the second difference being greater than the preset threshold is determined. The maximum frequency bandwidth is used as the quantitative test result of the anti-self-interference synchronization cancellation bandwidth; the general-purpose test instrument includes the spectrum analyzer.

9. The comprehensive testing method according to claim 1, characterized in that, The performance index to be tested is the minimum interference-to-signal frequency interval against self-interference, and S2 includes: The frequency and power of the communication signal output by the first radio frequency signal generator are fixed, and the power of the interference signal output by the second radio frequency signal generator is fixed. The frequency of the interference signal is adjusted, and the communication interference cancellation device is switched to bypass state and cancellation state respectively. The first power of the communication signal in the bypass state and the second power in the cancellation state, as well as the frequency of the interference signal in the cancellation state, are measured by a spectrum analyzer. Based on the second power and the first power, determine the attenuation power of the communication signals before and after cancellation; When the attenuation power is less than a preset fixed threshold, the frequency interval between the current communication signal and the interference signal is determined, and the frequency interval is used as the quantitative test result of the minimum interference frequency interval for anti-self-interference; the general test instrument includes the spectrum analyzer.

10. The comprehensive testing method according to claim 1, characterized in that, The performance indicator to be tested is the intermediate frequency access insertion loss; S2 includes: Switch the communication interference cancellation device to bypass mode and control the vector network analyzer to measure the insertion loss value between the signal input port and the signal output port within the operating frequency band. The maximum value of the insertion loss value within the operating frequency band is determined, and the maximum value is used as the quantitative test result of the intermediate frequency access insertion loss; the general-purpose test instrument includes a vector network analyzer, and the two test ports of the vector network analyzer are respectively connected to the signal input port and the signal output port of the communication interference cancellation device.

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