Radio frequency immunity test system for wireless equipment

Abstract

The invention relates to the technical field of radio frequency immunity testing of wireless equipment, in particular to a radio frequency immunity testing system of the wireless equipment, which comprises the following steps that: firstly, a sensitive frequency point detection module is used for carrying out standard frequency sweep testing and positioning sensitive frequency points of the wireless equipment, and then, a test scene construction module forms a target set based on the sensitive frequency points; the method comprises the following steps of: selecting a plurality of frequency points, constructing a test scene which distributes a specific modulation mode for each frequency point and defines a dynamic field intensity control function, generating and radiating a dynamic composite interference signal by an interference signal execution module according to the scene, fixing a carrier frequency by a dynamic field intensity control module in a test process, and controlling a synthetic field intensity in real time according to the dynamic field intensity control function, and the performance monitoring and evaluating module continuously monitors the performance of the equipment to evaluate the immunity of the equipment. The real and complex electromagnetic environment is effectively simulated, the technical defects that a traditional testing method is single and static are overcome, and the authenticity, pertinence and efficiency of testing are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of radio frequency immunity testing technology for wireless devices, and more particularly to a radio frequency immunity testing system for wireless devices. Background Technology

[0002] Before being put into use, wireless devices must undergo rigorous radio frequency (RF) immunity testing to assess their operational stability in complex electromagnetic environments. Currently, industry standard testing methods (such as IEC 61000-4-3) primarily involve radiating a constant-field-strength, single-modulation RF interference signal to the device under test in an anechoic chamber using a frequency sweep method, and monitoring for performance degradation. This method, as a fundamental compliance test, has been widely adopted.

[0003] However, existing standard testing methods have a significant technical flaw: their test signals cannot simulate the complex electromagnetic environment of the real world, where multiple communication standards coexist and field strengths dynamically change. This leads to a severe disconnect between laboratory testing conditions and the actual operating environment of the equipment. Some intermittent and coordinated faults that only surface in real-world conditions cannot be effectively detected, thus posing potential risks to the reliability and security of wireless devices. Summary of the Invention

[0004] To overcome the above shortcomings, the present invention provides a radio frequency immunity testing system for wireless devices, which aims to improve the problem that the test signals in the prior art cannot simulate the complex electromagnetic environment in the real world where multiple communication standard signals coexist and the field strength changes dynamically.

[0005] In a first aspect, the present invention provides the following technical solution: a wireless device radio frequency immunity testing system, comprising the following modules: The sensitive frequency detection module is used to perform standard radio frequency immunity sweep frequency tests on wireless devices in operation in an anechoic chamber, so as to radiate a sweep frequency interference signal with constant field strength to the device through the transmitting antenna, and monitor and record the sensitive frequency points where the wireless device experiences performance degradation. The test scenario construction module is used to form a target test frequency set based on the sensitive frequency points, and to construct a dynamic composite interference test scenario based on the target test frequency set. The scenario assigns a specific modulation method to each frequency point in the target test frequency set and defines a dynamic field strength control function that acts on the composite field strength of all frequency points. The interference signal execution module is used to cause a wireless device in operation to undergo a test under the dynamic composite interference test scenario in the anechoic chamber, generate a corresponding dynamic composite interference signal based on the dynamic composite interference test scenario, and radiate it to the wireless device. The dynamic field strength control module is used to fix the carrier frequency of the dynamic composite interference signal to the target test frequency set during the test, and control its composite field strength according to the dynamic field strength control function defined in the dynamic composite interference test scenario. The performance monitoring and evaluation module is used to continuously monitor the performance indicators of the wireless device while the dynamic composite interference signal is applied, so as to evaluate its immunity performance in a simulated complex electromagnetic environment.

[0006] Preferably, the monitoring process for the sensitive frequency points includes: Throughout the standard radio frequency immunity sweep test, the wireless device continuously runs one or more preset typical functions, and one or more performance parameters corresponding to the typical functions are monitored in real time. The performance parameters monitored in real time are compared with preset normal operating thresholds; When any of the performance parameters deviates from the normal operating threshold, it is determined that the wireless device has experienced performance degradation, and the specific frequency of the current frequency sweeping interference signal is recorded and marked as a sensitive frequency point.

[0007] Preferably, the construction process of the dynamic composite interference test scenario includes: From the recorded sensitive frequency points, one or more frequency points are selected to form the target test frequency point set; For each frequency point in the target test frequency point set, assign a specific modulation scheme from a predefined modulation scheme library; Define a dynamic field strength control function, which is used to control the total field strength after synthesizing all frequency points in the target test frequency point set, so that it cycles between the minimum field strength value and the maximum field strength value according to a preset time variation law; The target test frequency set, the specific modulation scheme assigned to each frequency point, and the dynamic field strength control function are collectively bound and stored as a callable dynamic composite interference test scenario.

[0008] Preferably, the definition process of the dynamic field strength control function includes: Set the minimum and maximum field strength values ​​for the synthesized field strength; Select a basic function type from a predefined function type library as the time variation pattern; Based on the selected basic function type, the minimum field strength value, and the maximum field strength value, determine the complete mathematical expression and parameters of the dynamic field strength control function; The complete mathematical expression and parameters are instantiated into an executable control function that can output a real-time changing field strength setpoint based on the current test time.

[0009] Preferably, the modulation scheme allocation process includes: Obtain the frequency value of each frequency point in the target test frequency point set; Iterate through each frequency point in the target test frequency point set, and for the currently iterated frequency point, perform the following allocation sub-step: Determine whether the current frequency value falls within a predefined known wireless communication standard frequency band; If the determination result is yes, then select a typical digital modulation scheme corresponding to the known wireless communication standard from the modulation scheme library and assign it to the current frequency point; If the determination result is negative, a modulation scheme is randomly selected from the modulation scheme library and assigned to the current frequency point; Based on the allocation results, a mapping table containing the correspondence between all the frequency points and their assigned modulation schemes is generated to complete the allocation.

[0010] Preferably, the generation process of the dynamic composite interference signal includes: Invoke the dynamic composite interference test scenario and read its target test frequency point set, the modulation method corresponding to each frequency point, and the dynamic field strength control function; Based on the target test frequency set and the modulation method corresponding to each frequency, the control signal generator generates a corresponding composite baseband signal and upconverts the composite baseband signal into an initial radio frequency signal. The target field strength value at the current moment is calculated based on the dynamic field strength control function, and the gain of the power amplifier is adjusted according to the target field strength value. The power amplifier is used to amplify the initial radio frequency signal at the adjusted gain to form a dynamic composite interference signal. The dynamic composite interference signal is radiated to the wireless device in the anechoic chamber via a transmitting antenna.

[0011] Preferably, the control process for the synthesized field strength includes: During the test phase of applying the dynamic composite interference signal, the output carrier frequency of the signal generator is set to multiple fixed frequencies included in the target test frequency set, and this setting is maintained for a preset continuous test time. During the continuous test period, the target value of the synthetic field strength required at the current moment is calculated in real time according to the dynamic field strength control function. The target value of the synthesized field strength is converted into a gain control command for the power amplifier; According to the gain control command, the gain of the power amplifier is adjusted in real time so that the composite field strength of the dynamic composite interference signal generated at the wireless device is consistent with the target value of the composite field strength.

[0012] Preferably, the continuous monitoring process for the performance indicators of the wireless device includes: During the test, the wireless device continuously performs one or more preset communication and auxiliary functions. Multiple performance parameters corresponding to the communication and auxiliary functions can be collected in real time through the built-in monitoring interface of the wireless device or external testing instruments. Each of the performance parameters collected in real time is compared with the preset normal operating tolerance range for each parameter. When any of the performance parameters continuously deviates from its corresponding normal operating tolerance range, the wireless device is determined to have an immunity failure, and the failure event is recorded. Based on the failure events recorded throughout the entire testing process, an immunity performance evaluation report for the wireless device is generated.

[0013] The present invention has the following beneficial effects: 1. In this invention, by constructing a dynamic composite interference test scenario that includes multiple frequency points and multiple modulation methods, and controlling the dynamic change of its composite field strength, this invention can accurately simulate a real, crowded and time-varying electromagnetic environment, thereby exposing potential faults that cannot be detected by equipment under traditional single and static interference tests, and significantly improving the accuracy and reliability of the test.

[0014] 2. In this invention, the sensitive frequency points of the device are quickly located by standard frequency sweeping, and then high-intensity dynamic composite interference is applied only to these sensitive frequency points. This strategy of first reconnaissance and then reinforcement avoids time-consuming and unnecessary dynamic testing across the entire frequency band. While ensuring the depth of testing, it greatly improves testing efficiency and saves testing costs.

[0015] 3. In this invention, the testing process is modularized, integrating a complete process from sensitive frequency detection, intelligent scene construction, dynamic signal generation and control to final performance evaluation. By intelligently allocating modulation methods to different frequency points through predefined strategies, the testing process is automated and intelligent, reducing reliance on operator experience and ensuring the consistency and repeatability of test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the architecture of a wireless device radio frequency immunity testing system proposed in this invention. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a wireless device radio frequency immunity testing system, such as... Figure 1 As shown, it includes the following steps: The sensitive frequency detection module is used to perform standard radio frequency immunity sweep frequency tests on wireless devices in operation in an anechoic chamber. It transmits a sweep frequency interference signal with a constant field strength through the transmitting antenna and monitors and records sensitive frequency points where the wireless device experiences performance degradation.

[0019] Furthermore, the monitoring process for sensitive frequencies includes: Throughout the standard radio frequency immunity sweep test, the wireless device is continuously operated with one or more preset typical functions, and one or more performance parameters corresponding to the typical functions are monitored in real time. The real-time monitored performance parameters are compared with the preset normal operating thresholds; When any performance parameter deviates from the normal operating threshold, it is determined that the wireless device has experienced performance degradation, and the specific frequency of the current frequency sweep interference signal is recorded and marked as a sensitive frequency point.

[0020] Specifically, the sensitive frequency detection module operates in a standard anechoic chamber equipped with a transmitting antenna, a turntable, and absorbing materials. Before the test begins, the wireless device (such as a smartphone) is set to one or more typical operating modes via control software. For example, it performs VoLTE voice calls, establishes a high-speed data connection and downloads files, and simultaneously enables the device's Wi-Fi hotspot and GPS positioning functions. Correspondingly, the system presets the performance parameters to be monitored and their normal operating thresholds. For example, the uplink / downlink bit error rate (BER) threshold of the communication link is set to 1E-6, the signal-to-noise ratio (SINAD) threshold of the audio output is set to 20dB, and the upper limit of the device casing surface temperature is 50 degrees Celsius. After the test starts, the module controls the signal generator and power amplifier to radiate a frequency sweep interference signal conforming to the IEC 61000-4-3 standard with a constant field strength of 3 V / m through the transmitting antenna. This signal is 80% amplitude modulated with a 1 kHz sine wave and operates within a frequency range of 80 MHz to 2.7 GHz at a frequency not exceeding [a certain value]. Continuous frequency sweep at a rate of ten octaves per second; Throughout the frequency sweep process, the sensitive frequency detection module performs real-time monitoring and recording. Specifically, it reads the bit error rate recorded internally through the device's own diagnostic interface (such as the MDM interface), collects audio quality parameters through an audio analyzer connected to the audio interface, monitors the device's surface temperature through an infrared thermal imager, and the control software cyclically compares the real-time collected performance parameters with preset normal operating thresholds. For example, when the frequency sweep signal reaches 1.2 GHz, the system detects that the device's downlink bit error rate jumps from 1E-7 to 1E-5 and remains so for more than 100 milliseconds. This parameter has deviated from its preset threshold (1E-6). Once performance degradation is determined, the module immediately records the center frequency of the frequency sweep interference signal at this moment—1.2 GHz—and stores it as a sensitive frequency point. This, along with the occurrence time, the type of parameter deviation, and the degree of deviation, is stored in a database file named "Sensitive Frequency Point List." Finally, after completing the frequency sweep test for the entire frequency band, the module outputs a list containing all recorded sensitive frequencies (e.g., 512 MHz, 980 MHz, 1.2 GHz). A complete list of fault information (2.1 GHz) and its corresponding fault information provides accurate data input for the construction of subsequent test scenarios; By combining standard frequency sweeping with real-time performance monitoring, the electromagnetically sensitive frequency points of wireless devices can be accurately located, providing a precise data foundation for subsequent high-intensity, high-efficiency targeted immunity testing.

[0021] The test scenario construction module is used to form a target test frequency set based on sensitive frequency points, and to construct a dynamic composite interference test scenario based on the target test frequency set. The scenario assigns a specific modulation scheme to each frequency point in the target test frequency set and defines a dynamic field strength control function that acts on the composite field strength of all frequency points.

[0022] Furthermore, the construction process for dynamic composite interference test scenarios includes: Select one or more frequency points from the recorded sensitive frequency points to form a target test frequency point set; For each frequency point in the target test frequency point set, assign a specific modulation scheme from the predefined modulation scheme library; Define a dynamic field strength control function, which is used to control the total field strength after synthesizing all frequency points in the target test frequency point set, so that it changes cyclically between the minimum field strength value and the maximum field strength value according to a preset time variation law; The target test frequency set, the specific modulation scheme assigned to each frequency point, and the dynamic field strength control function are bound together and stored as a dynamic composite interference test scenario that can be called.

[0023] Furthermore, the definition process of the dynamic field strength control function includes: Set the minimum and maximum field strength values ​​for the synthesized field strength; Select a basic function type from a predefined function type library as the time variation pattern; Based on the selected basic function type, minimum field strength value, and maximum field strength value, determine the complete mathematical expression and parameters of the dynamic field strength control function; The complete mathematical expression and parameters are instantiated into an executable control function that can output a real-time changing field strength setpoint based on the current test time.

[0024] Furthermore, the modulation scheme allocation process includes: Obtain the frequency value of each frequency point in the target test frequency point set; Iterate through each frequency point in the target test frequency point set, and for the currently iterated frequency point, perform the following allocation sub-step: Determine whether the current frequency value falls within a predefined known wireless communication standard frequency band; If the judgment result is yes, then select a typical digital modulation scheme corresponding to the known wireless communication standard from the modulation scheme library and assign it to the current frequency point; If the judgment result is negative, a modulation scheme is randomly selected from the modulation scheme library and assigned to the current frequency point; Based on the allocation results, a mapping table containing the correspondence between all frequency points and their assigned modulation schemes is generated to complete the allocation.

[0025] Specifically, the test scenario construction module receives the output from the sensitive frequency detection module, which is a list of sensitive frequencies, such as [512 MHz, 980 MHz, 1.2 GHz, 2.1 GHz]. The test scenario construction module first selects all or part of the frequencies from the list. In this embodiment, all four frequencies are selected to form the target test frequency set. The unit is MHz; The test scenario building module comes with a pre-built modulation method library. and a known wireless communication standard frequency band mapping table. -Fi2.4G": [2400, 2480]}; Subsequently, the module iterates through each frequency point in set F. Whether it falls into Within any frequency band, for example =980 MHz falls into the "GSM900" band. If it falls into the band, then from Select the typical modulation scheme corresponding to the standard, such as assigning GMSK to "GSM900". If it does not fall into the category (e.g.) =512 MHz), then from A frequency-modulation mapping table is generated by randomly assigning one type of frequency, such as QPSK. As shown in Table 1 below, a frequency-modulation mapping table is generated. Table 1:

[0026] The test scenario construction module needs to define a function E(t) to control the dynamic change of the total composite field strength with time t. Specifically, it sets the minimum field strength. Maximum field strength From a predefined function type library (such as {sine wave, triangle wave, square wave}), a sine wave is selected as the time variation law. Based on the sine wave, the complete function expression is determined as follows: ; in, / / Average field strength; / / Range of field strength change; / / The modulation frequency is set to 0.1Hz to achieve a complete change cycle of 10 seconds. Therefore, the complete dynamic field strength control function is: (Unit: V / m); Instantiate this mathematical expression as a callable function object in the software. The input is the current test time t (seconds), and the output is the real-time field strength setting value; Finally, the test scenario construction module combines the target test frequency set F, the frequency-modulation mapping table, and the dynamic field strength control function. They are packaged together and stored in the system's scenario configuration database with a specific scenario name for later testing. Through the above steps, by intelligently allocating modulation methods and defining dynamic field strength functions, discrete sensitive frequency points can be constructed into a reusable test scenario that can highly simulate a real and complex electromagnetic environment, providing a core basis for subsequently applying precise and severe interference stress.

[0027] The interference signal execution module is used to subject a working wireless device to a dynamic composite interference test scenario in an anechoic chamber. Based on the dynamic composite interference test scenario, it generates a corresponding dynamic composite interference signal and radiates it to the wireless device.

[0028] Furthermore, the generation process of dynamic composite interference signals includes: Call the dynamic composite interference test scenario and read its target test frequency point set, the modulation mode corresponding to each frequency point and the dynamic field strength control function; Based on the target test frequency set and the modulation method corresponding to each frequency, the control signal generator generates a corresponding composite baseband signal and upconverts the composite baseband signal into an initial radio frequency signal. The target field strength value at the current moment is calculated based on the dynamic field strength control function, and the gain of the power amplifier is adjusted according to the target field strength value. A power amplifier is used to amplify the initial radio frequency signal according to the adjusted gain to form a dynamic composite interference signal; The wireless device radiates dynamic composite interference signals into the anechoic chamber via a transmitting antenna.

[0029] Specifically, the interference signal execution module retrieves the scenario file named "Dynamic_Stress_Scenario_1" stored by the test scenario construction module from the system's scenario configuration database. After parsing, it obtains the following key parameters: the target test frequency set F: {512 MHz, 980 MHz, 1200 MHz, 2100 MHz}, the modulation mapping tables: 512 / QPSK, 980 / GMSK, 1200 / 16QAM, 2100 / π / 4-DQPSK, and the dynamic field strength control function. (V / m); The interference signal execution module controls a multi-channel vector signal generator. In the baseband section, the signal generator independently generates four modulated signals based on the frequency point set F and the modulation mapping table through digital signal processing technology. Then, the digital samples of these four signals are superimposed in the time domain to synthesize a complex composite baseband signal s_bb(t). Subsequently, the signal generator modulates s_bb(t) onto a unified radio frequency carrier (e.g., 1 GHz) and outputs an initial radio frequency signal s_rf_initial(t) containing information of all four interference frequency points. At this time, the power of the signal is low and constant. At second t after the test begins, the module calls the dynamic field strength control function. The target field strength value at the current moment is calculated. For example, at t=2.5 seconds: ; The system has a pre-stored field strength-power calibration table, which is obtained through field strength probe measurements during the field calibration phase. This table records the forward power required by the power amplifier when a specific field strength (e.g., 1V / m, 3V / m, 5V / m...) is generated at a specific location in the anechoic chamber. By looking up a table and performing linear interpolation, the module converts the target field strength of 4.4 V / m into the required forward power setpoint. (e.g., 35W), the output power of the power amplifier With its input power The relationship between the gain G and the gain G is: Given the power of s_rf_initial(t) output by the signal generator. It is fixed (e.g., 0.1W) in order to achieve the required output power. (35 W), required amplifier gain Determined by the following formula: ; Substitute the values (times), converted to decibels: ; The module sends a command to the power amplifier via the GPIB or LAN interface to set its gain to 25.4 dB; The power amplifier amplifies the initial radio frequency signal s_rf_initial(t) according to the set gain to generate the final dynamic composite interference signal. This high-power signal is radiated into the anechoic chamber through a broadband transmitting antenna (such as a log-periodic antenna) and is precisely applied to the wireless device located in the calibrated uniform field area. Through the above steps, the digitized test scenario parameters can be converted into physical signals in real time, and the gain of the power amplifier can be precisely controlled according to the dynamic function, so as to accurately and controllably apply dynamic composite interference signals that highly simulate the real environment to the device under test.

[0030] The dynamic field strength control module is used to fix the carrier frequency of the dynamic composite interference signal to the target test frequency set during the test, and control its composite field strength according to the dynamic field strength control function defined in the dynamic composite interference test scenario.

[0031] Furthermore, the control process for the synthesized field strength includes: During the test phase of applying dynamic composite interference signals, the output carrier frequency of the signal generator is set to multiple fixed frequencies included in the target test frequency set, and this setting is maintained for a preset continuous test time. During the continuous testing period, the target value of the synthetic field strength required at the current moment is calculated in real time according to the dynamic field strength control function; The target value of the synthesized field strength is converted into a gain control command for the power amplifier; Based on the gain control command, the gain of the power amplifier is adjusted in real time so that the combined field strength of the dynamic composite interference signal generated at the wireless device is consistent with the target value of the combined field strength.

[0032] Specifically, during the dynamic composite interference test phase, the dynamic field strength control module first instructs the signal generator to stop the frequency sweep mode and fix its output carrier frequency to the target test frequency set defined in the scenario, such as {512 MHz, 980 MHz, 1200 MHz, 2100 MHz}. This frequency setting remains unchanged throughout the entire test phase. A preset continuous test time is also set, such as 60 seconds. The test officially begins, and the timer starts from t=0. During the entire 60 seconds of the test, the module executes the following loop at a high frequency (e.g., 100 times per second, i.e., a 100Hz control cycle): In each control cycle k, the current precise test time is obtained. Calculate the target value of the composite field strength at that moment. For example, at t=12.345s, substituting into the function... ,get ; The system has a pre-stored field strength-forward power lookup table obtained during the site calibration phase. The module uses table lookup and interpolation algorithms to... Convert to the forward power target value that requires the power amplifier output. (e.g., 38.5 W), then, according to the power amplifier gain formula ,in Given a fixed output power of the signal generator (e.g., 0.1 W), calculate the amplifier gain value that needs to be set. Specifically: ; this The value is the final gain control command; The control module transmits the calculated data via a communication bus (such as GPIB or LAN). A 25.86dB command is sent to the power amplifier in real time. Upon receiving the command, the power amplifier quickly adjusts its gain to the target value. To ensure control accuracy, the system forms a closed loop; that is, the forward power detector inside the power amplifier will measure the actual output power... Feedback is sent to the control module, and the control module will... and If a small deviation is found during the comparison, the control algorithm (e.g., a proportional-integral PI controller) will calculate the gain compensation in the next control cycle. and to Fine-tuning is performed to allow the actual synthesized field strength generated at the wireless device to be dynamically and accurately tracked. The curve of change; Through the above steps, high-frequency real-time closed-loop control can ensure that the interference field strength applied to the wireless device during fixed-frequency testing can accurately track the preset dynamic change pattern, thereby achieving dynamic, continuous and accurate stress assessment of the device's immunity to interference.

[0033] The performance monitoring and evaluation module is used to continuously monitor the performance indicators of wireless devices while applying dynamic composite interference signals, in order to evaluate their immunity performance in a simulated complex electromagnetic environment.

[0034] Furthermore, the continuous monitoring process for the performance metrics of wireless devices includes: During the test, the wireless device is made to continuously perform one or more of its preset communication and auxiliary functions; Multiple performance parameters corresponding to communication and auxiliary functions can be collected in real time through the built-in monitoring interface of the wireless device or external testing instruments. The various performance parameters collected in real time are compared one by one with the preset normal working tolerance range for each parameter; When any performance parameter continuously deviates from its corresponding normal operating tolerance range, the wireless device is determined to have an immunity failure, and the failure event is recorded. Based on the failure events recorded throughout the entire testing process, an immunity performance evaluation report for the wireless device is generated.

[0035] Specifically, before the test begins, the typical combination of functions that the device under test (such as a 5G smartphone) needs to continuously run is configured in the performance monitoring and evaluation module software. These functions include communication functions (establishing and maintaining a 5G NR connection with the base station simulator for continuous downlink data transmission) and auxiliary functions (activating the device's Wi-Fi module (in a connected but no data transmission state), Bluetooth module (maintaining a connection with a pair of headphones), and built-in GPS receiver for continuous positioning). At the same time, the performance parameters to be monitored and their normal operating tolerance ranges are set for each function. Specifically, these are: 5G downlink throughput (tolerance range is [90% of theoretical peak, theoretical peak]; if the theoretical peak is 1 Gbps, then the tolerance is [900 Mbps, 1000 Mbps]), 5G downlink block error rate (tolerance range is [0, 10%]), audio output signal-to-noise ratio (measured via Bluetooth headphones: tolerance range is [20 dB, infinity]), and GPS positioning accuracy (tolerance range is [0, 5] meters). During the entire test cycle (e.g., 60 seconds) under dynamic composite interference signal, the module collects data in parallel through multiple interfaces. It reads the 5G downlink throughput and 5G downlink block error rate at a frequency of 10 times per second through the test interface of the base station simulator, samples and calculates the audio output signal-to-noise ratio at a frequency of 1000 times per second through the audio analyzer (connected to the output of the Bluetooth headset), and obtains GPS positioning accuracy data through the GPS simulator and device logs. The collected data stream is sent to the comparison engine in real time. The engine compares each data point with its corresponding tolerance range. The judgment logic is as follows: failure is not determined by a single exceedance. The module sets a continuous deviation time threshold, such as 100 milliseconds. Only when the value of a certain performance parameter (such as throughput) exceeds its tolerance range for a period of 100 milliseconds or more, the module determines that an immunity failure event has occurred. For example, when the test is in the 25th second, the 5G downlink throughput drops sharply from 950 Mbps to 600 Mbps and remains below the tolerance lower limit of 900 Mbps for the next 150 milliseconds. The module determines that a failure has occurred at the 25.1st second. Once a failure is detected, the module immediately creates a detailed record in the event log database. This record includes at least the failure type (e.g., 5G throughput degradation), failure start time, failure duration, failure severity (e.g., minimum value: 600 Mbps), and test scenario parameters that triggered the failure (e.g., interference frequency: {512, 980, 1200, 2100}MHz, instantaneous field strength: 4.8 V / m). After the test, the module automatically analyzes the entire event log and generates a structured immunity performance evaluation report. The report includes an overview of the test scenario, a list and statistics of all recorded failure events (such as the total number of failures and the number of failures of each type), and an overall conclusion on the device's immunity performance (e.g., under the dynamic composite interference test, there were 3 performance degradations of level B without communication interruption, which is considered a pass, or 5 communication interruptions, which is considered a fail). Through the above steps, multiple performance parameters can be collected and compared in real time, enabling an objective, quantitative, and traceable accurate assessment of the performance of wireless devices under complex interference, providing a direct basis for the final performance determination.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wireless device radio frequency immunity testing system, characterized in that, Includes the following modules: The sensitive frequency detection module is used to perform standard radio frequency immunity sweep frequency tests on wireless devices in operation in an anechoic chamber, so as to radiate a sweep frequency interference signal with constant field strength to the device through the transmitting antenna, and monitor and record the sensitive frequency points where the wireless device experiences performance degradation. The test scenario construction module is used to form a target test frequency set based on the sensitive frequency points, and to construct a dynamic composite interference test scenario based on the target test frequency set. The scenario assigns a specific modulation method to each frequency point in the target test frequency set and defines a dynamic field strength control function that acts on the composite field strength of all frequency points. The interference signal execution module is used to cause a wireless device in operation to undergo a test under the dynamic composite interference test scenario in the anechoic chamber, generate a corresponding dynamic composite interference signal based on the dynamic composite interference test scenario, and radiate it to the wireless device. The dynamic field strength control module is used to fix the carrier frequency of the dynamic composite interference signal to the target test frequency set during the test, and control its composite field strength according to the dynamic field strength control function defined in the dynamic composite interference test scenario. The performance monitoring and evaluation module is used to continuously monitor the performance indicators of the wireless device while the dynamic composite interference signal is applied, so as to evaluate its immunity performance in a simulated complex electromagnetic environment.

2. The radio frequency immunity testing system for wireless devices according to claim 1, characterized in that, The monitoring process for the sensitive frequency points includes: Throughout the standard radio frequency immunity sweep test, the wireless device continuously runs one or more preset typical functions, and one or more performance parameters corresponding to the typical functions are monitored in real time. The performance parameters monitored in real time are compared with preset normal operating thresholds; When any of the performance parameters deviates from the normal operating threshold, it is determined that the wireless device has experienced performance degradation, and the specific frequency of the current frequency sweeping interference signal is recorded and marked as a sensitive frequency point.

3. The radio frequency immunity testing system for wireless devices according to claim 1, characterized in that, The construction process of the dynamic composite interference test scenario includes: From the recorded sensitive frequency points, one or more frequency points are selected to form the target test frequency point set; For each frequency point in the target test frequency point set, assign a specific modulation scheme from a predefined modulation scheme library; Define a dynamic field strength control function, which is used to control the total field strength after synthesizing all frequency points in the target test frequency point set, so that it cycles between the minimum field strength value and the maximum field strength value according to a preset time variation law; The target test frequency set, the specific modulation scheme assigned to each frequency point, and the dynamic field strength control function are collectively bound and stored as a callable dynamic composite interference test scenario.

4. The radio frequency immunity testing system for wireless devices according to claim 3, characterized in that, The definition process of the dynamic field strength control function includes: Set the minimum and maximum field strength values ​​for the synthesized field strength; Select a basic function type from a predefined function type library as the time variation pattern; Based on the selected basic function type, the minimum field strength value, and the maximum field strength value, determine the complete mathematical expression and parameters of the dynamic field strength control function; The complete mathematical expression and parameters are instantiated into an executable control function that can output a real-time changing field strength setpoint based on the current test time.

5. The radio frequency immunity testing system for wireless devices according to claim 3, characterized in that, The modulation scheme allocation process includes: Obtain the frequency value of each frequency point in the target test frequency point set; Iterate through each frequency point in the target test frequency point set, and for the currently iterated frequency point, perform the following allocation sub-step: Determine whether the current frequency value falls within a predefined known wireless communication standard frequency band; If the determination result is yes, then select a typical digital modulation scheme corresponding to the known wireless communication standard from the modulation scheme library and assign it to the current frequency point; If the determination result is negative, a modulation scheme is randomly selected from the modulation scheme library and assigned to the current frequency point; Based on the allocation results, a mapping table containing the correspondence between all the frequency points and their assigned modulation schemes is generated to complete the allocation.

6. The radio frequency immunity testing system for wireless devices according to claim 1, characterized in that, The generation process of the dynamic composite interference signal includes: Invoke the dynamic composite interference test scenario and read its target test frequency point set, the modulation method corresponding to each frequency point, and the dynamic field strength control function; Based on the target test frequency set and the modulation method corresponding to each frequency, the control signal generator generates a corresponding composite baseband signal and upconverts the composite baseband signal into an initial radio frequency signal. The target field strength value at the current moment is calculated based on the dynamic field strength control function, and the gain of the power amplifier is adjusted according to the target field strength value. The power amplifier is used to amplify the initial radio frequency signal at the adjusted gain to form a dynamic composite interference signal. The dynamic composite interference signal is radiated to the wireless device in the anechoic chamber via a transmitting antenna.

7. The radio frequency immunity testing system for wireless devices according to claim 1, characterized in that, The control process for the synthesized field strength includes: During the test phase of applying the dynamic composite interference signal, the output carrier frequency of the signal generator is set to multiple fixed frequencies included in the target test frequency set, and this setting is maintained for a preset continuous test time. During the continuous test period, the target value of the synthetic field strength required at the current moment is calculated in real time according to the dynamic field strength control function. The target value of the synthesized field strength is converted into a gain control command for the power amplifier; According to the gain control command, the gain of the power amplifier is adjusted in real time so that the composite field strength of the dynamic composite interference signal generated at the wireless device is consistent with the target value of the composite field strength.

8. The radio frequency immunity testing system for wireless devices according to claim 1, characterized in that, The continuous monitoring process for the performance indicators of the wireless device includes: During the test, the wireless device continuously performs one or more preset communication and auxiliary functions. Multiple performance parameters corresponding to the communication and auxiliary functions can be collected in real time through the built-in monitoring interface of the wireless device or external testing instruments. Each of the performance parameters collected in real time is compared with the preset normal operating tolerance range for each parameter. When any of the performance parameters continuously deviates from its corresponding normal operating tolerance range, the wireless device is determined to have an immunity failure, and the failure event is recorded. Based on the failure events recorded throughout the entire testing process, an immunity performance evaluation report for the wireless device is generated.

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