Nonlinear characteristic measuring system based on vector analyzer

Abstract

The application relates to the field of nonlinear measurement, in particular to a nonlinear characteristic measurement system based on a vector analyzer. The application is provided with a signal transmitting module used for controlling a transmitting end to transmit a plurality of transmission signals; a transmission collecting module used for collecting transmission data of the transmission signals and extracting transmission characteristics of the transmission signals corresponding to single transmission; a cumulative analysis module used for determining transmission cumulative characteristic values of the transmission signals according to the transmission characteristics and the number of transmission signals received by a target body, so as to mark the single transmission; a stability evaluation module used for analyzing and processing the transmission signals of the single transmission based on the marking result of the cumulative analysis module; and a feedback warning module used for issuing a warning prompt information in response to the evaluation result of the stability evaluation module. The application can more comprehensively and accurately dynamically evaluate the nonlinear distortion degree of the target body.

Description

Technical Field

[0001] This invention relates to the field of nonlinear measurement, and more particularly to a nonlinear characteristic measurement system based on a vector analyzer. Background Technology

[0002] In the field of modern communications, the operating state of radio frequency devices such as power amplifiers and mixers directly affects system performance. Due to the combined effects of semiconductor physical characteristics, dynamic operating state, and external circuit environment, these devices inevitably exhibit nonlinear effects when operating at high power or wide bandwidth, which manifest as signal distortion, efficiency reduction, and deterioration of system stability. In order to ensure the signal quality and stability of communication systems, multi-dimensional measurement and dynamic analysis are used to accurately measure and analyze the nonlinear characteristics of these devices for optimization design and performance evaluation.

[0003] Chinese Patent Application Publication No. CN117527103A discloses a method for measuring the nonlinear characteristics of a multi-source radio frequency signal channel. This method includes the following steps: S1: Selecting a signal source, ensuring that the frequency range and output power of the signal source meet the test requirements; S2: Preparing and debugging the radio frequency measurement equipment for real-time monitoring and analysis of the signal transmission channel performance; S3: Modeling the transmission path of the multi-source radio frequency signal and understanding the signal propagation, attenuation, distortion, and interference sources in the channel; S4: Selecting measurement parameters and performing the measurement, measuring the signal channel according to the measurement parameters and the measurement equipment. The measurement parameters include signal power, spectral characteristics, amplitude, and limits. This invention allows for the selection of signal source power, frequency, and other information according to the measurement equipment before establishing the path model, ensuring the effectiveness of a single measurement.

[0004] However, the following problems still exist in the existing technology.

[0005] When measuring nonlinear characteristics, there is a lack of consideration for the dynamic information of nonlinearity in the time domain, resulting in insufficient dynamic adaptability. Summary of the Invention

[0006] Therefore, the present invention provides a nonlinear characteristic measurement system based on a vector analyzer to overcome the problems of insufficient dynamic adaptability and lack of consideration for time-domain nonlinear dynamic information in the prior art.

[0007] To achieve the above objectives, the present invention provides a nonlinear characteristic measurement system based on a vector analyzer, comprising:

[0008] The signal transmitting module is used to control the transmitting end to transmit several transmission signals;

[0009] A transmission acquisition module, which is connected to the signal transmission module, is used to acquire the transmission data of the transmission signal and extract the transmission characteristics of the transmission signal corresponding to a single transmission. The transmission characteristics include the average power attenuation at each stage and the number of branches in the transmission path.

[0010] The cumulative analysis module, which is connected to the transmission acquisition module, is used to determine the cumulative transmission characterization value of the transmission signal based on the transmission characteristics and the number of transmission signals received by the target body, so as to mark the single transmission.

[0011] A stability assessment module, connected to the cumulative analysis module, is used to analyze and process the transmission signal of the single transmission based on the marking results of the cumulative analysis module, including:

[0012] The signal compensation calibration is performed on the single transmission in advance. After the signal compensation calibration, the temperature change time-domain curve of the target body is constructed. It is determined whether there is a temperature change moment in the single transmission. The complete characteristics of the transmission signal corresponding to the temperature change moment are obtained. The distortion tendency characterization parameter of the single transmission is calculated to evaluate whether the transmission signal is an abnormal signal.

[0013] The feedback and early warning module is connected to the stability assessment module and issues early warning information in response to the assessment results of the stability assessment module.

[0014] The complete features include nonlinear error spillover and target saturation signal margin.

[0015] Further, the cumulative analysis module is used to determine the transmission cumulative characterization value of the transmitted signal, including:

[0016] The sum of the ratio of the average power attenuation of the transmitted signal to the average attenuation threshold and the ratio of the number of branches of the transmission path to the number of branches threshold is used as the first transmission accumulation feature.

[0017] The ratio of the number of transmitted signals received by the target to a threshold number of transmitted signals is used as the second transmission accumulation feature.

[0018] The first transmission accumulation feature and the second transmission accumulation feature are weighted and summed to determine the transmission accumulation characterization value.

[0019] Furthermore, the cumulative analysis module is used to mark the single transmission, including:

[0020] If the cumulative transmission characteristic value of the transmitted signal is greater than or equal to the cumulative transmission characteristic threshold, then the corresponding single transmission is marked.

[0021] Furthermore, the stability evaluation module is used to analyze and process the transmission signal of the single transmission, including:

[0022] If any single transmission is marked, the transmission signal of that single transmission is analyzed and processed.

[0023] Furthermore, the stability assessment module is used to determine whether a temperature abrupt change occurs during the single transmission, including:

[0024] Used to obtain the slope of the time-domain curve of the temperature change of the target body at several moments;

[0025] If there exists a slope greater than or equal to a slope threshold at any given moment, then it is determined that a temperature abrupt change occurred during the single transmission.

[0026] Furthermore, the stability evaluation module is used to calculate the distortion tendency characterization parameters of the single transmission, including:

[0027] The ratio of the nonlinear error spillover to the spillover threshold is used as the first distortion tendency feature;

[0028] The ratio of the target body's saturation signal margin to the saturation signal margin threshold is used as the second distortion tendency feature.

[0029] The sum of the first distortion tendency feature and the second distortion tendency feature is used as the distortion tendency characterization parameter.

[0030] Furthermore, the stability assessment module is used to assess whether the transmitted signal is an abnormal signal, including:

[0031] If the distortion tendency characterization parameter of a single transmission is greater than or equal to the distortion tendency characterization parameter threshold, then the corresponding transmission signal is evaluated as the abnormal signal.

[0032] Furthermore, the feedback early warning module responds to the evaluation result of the stability evaluation module, including:

[0033] If the stability assessment module determines that the transmitted signal is abnormal, a warning message will be issued.

[0034] Furthermore, the stability assessment module is used to pre-calibrate the signal compensation for the single transmission, including compensating for the signal amplitude and phase.

[0035] Furthermore, the feedback warning module is used to issue warning information including signal amplitude and phase.

[0036] Compared with existing technologies, this invention includes a signal transmission module for controlling the transmitter to transmit several transmission signals; a transmission acquisition module connected to the signal transmission module for acquiring transmission data of the transmission signals and extracting transmission characteristics of the transmission signals corresponding to a single transmission; a cumulative analysis module connected to the transmission acquisition module for determining the cumulative transmission characterization value of the transmission signals based on the transmission characteristics and the number of transmission signals received by the target body, so as to mark the single transmission; a stability evaluation module connected to the cumulative analysis module for analyzing and processing the transmission signals of a single transmission based on the marking results of the cumulative analysis module; and a feedback early warning module connected to the stability evaluation module for issuing early warning information in response to the evaluation results of the stability evaluation module. This invention can more comprehensively and accurately dynamically evaluate the degree of nonlinear distortion of the target body.

[0037] In particular, this invention includes a cumulative analysis module to dynamically correlate and quantify the transmission environment and nonlinear distortion. It considers the impact of the transmission environment on the transmitted signal, further reflecting the potential interference level of the transmitted signal on the nonlinear distortion of the target. In practice, during transmission, the signal passes through several devices step-by-step along a predetermined transmission path. Based on the power loss of each device along the transmission path, the linear loss of the transmission path is quantitatively assessed. By counting the number of branches in the transmission path, the number of signal splitters and couplers is statistically analyzed to quantify the multipath interference risk and characterize the path complexity of a single transmission. Simultaneously, the number of signals received in a single transmission reflects the instantaneous load state of the target, i.e., the power amplifier. Therefore, this invention comprehensively considers the above characteristics to determine the cumulative transmission characterization value to characterize the potential aggravation of nonlinear distortion of the target by a single transmission, providing data support for subsequent labeling of single transmissions. This invention can more comprehensively and accurately dynamically assess the degree of nonlinear distortion of the target.

[0038] In particular, this invention sets up a stability evaluation module to analyze and process the transmission signal corresponding to the marked single transmission. A pre-compensation mechanism is used to compensate the signal amplitude to correct gain fluctuations in the transmission path. Phase compensation eliminates group delay differences, thereby eliminating linear distortion interference and ensuring that the subsequently extracted nonlinear error spillover more accurately reflects the nonlinear characteristics of the target. Based on this, the temperature change of the target is used as a starting point to construct a time-domain curve of the target's temperature change, calculate the instantaneous slope at several corresponding moments, and identify abnormal temperature rises in the target. Sudden temperature changes are often accompanied by deterioration of the device's nonlinear characteristics, thus accurately capturing the target's distortion critical state. The degree of nonlinear distortion of the target is quantified by the nonlinear error spillover. Correspondingly, the target's saturation signal margin can assess the severity of exceeding the target's operating saturation state. Furthermore, this invention calculates distortion tendency characterization parameters for a single transmission to characterize the severity of the target's nonlinear distortion, providing data support for subsequent evaluation of whether the corresponding transmission signal is an abnormal signal. This invention can more comprehensively and accurately assess the degree of nonlinear distortion of the target. Attached Figure Description

[0039] Figure 1 This is a functional block diagram of a nonlinear characteristic measurement system based on a vector analyzer, according to an embodiment of the invention.

[0040] Figure 2 This is a logic decision diagram for marking a single transmission in an embodiment of the invention;

[0041] Figure 3 This is a logic diagram for determining whether a temperature change occurs during a single transmission in an embodiment of the invention.

[0042] Figure 4 This is a logic diagram for evaluating whether a transmitted signal is an abnormal signal in an embodiment of the invention. Detailed Implementation

[0043] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0044] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Please see Figure 1 As shown, Figure 1 This is a functional block diagram of a nonlinear characteristic measurement system based on a vector analyzer according to an embodiment of the present invention. The nonlinear characteristic measurement system based on a vector analyzer according to an embodiment of the present invention includes:

[0048] The signal transmitting module is used to control the transmitting end to transmit several transmission signals;

[0049] A transmission acquisition module, which is connected to the signal transmission module, is used to acquire the transmission data of the transmission signal and extract the transmission characteristics of the transmission signal corresponding to a single transmission. The transmission characteristics include the average power attenuation at each stage and the number of branches in the transmission path.

[0050] The cumulative analysis module, which is connected to the transmission acquisition module, is used to determine the cumulative transmission characterization value of the transmission signal based on the transmission characteristics and the number of transmission signals received by the target body, so as to mark the single transmission.

[0051] A stability assessment module, connected to the cumulative analysis module, is used to analyze and process the transmission signal of the single transmission based on the marking results of the cumulative analysis module, including:

[0052] The signal compensation calibration is performed on the single transmission in advance. After the signal compensation calibration, the temperature change time-domain curve of the target body is constructed. It is determined whether there is a temperature change moment in the single transmission. The complete characteristics of the transmission signal corresponding to the temperature change moment are obtained. The distortion tendency characterization parameter of the single transmission is calculated to evaluate whether the transmission signal is an abnormal signal.

[0053] The feedback and early warning module is connected to the stability assessment module and issues early warning information in response to the assessment results of the stability assessment module.

[0054] The complete features include nonlinear error spillover and target saturation signal margin.

[0055] Specifically, the transmitted data refers to a series of related data involved in the transmission of the signal, including the transmission characteristics and integrity of the transmitted signal, the number of transmitted signals received by the target body, and the temperature of the target body, wherein the target body is a power amplifier.

[0056] Specifically, there are no restrictions on the specific structure of the signal transmission module, transmission acquisition module, cumulative analysis module, stability assessment module, and feedback early warning module. Each module or its units can be composed of logic components or combinations of logic components. Logic components include field-programmable processors, computers, or microprocessors in computers.

[0057] Specifically, the cumulative analysis module is used to determine the cumulative transmission characteristic value of the transmitted signal, including:

[0058] The sum of the ratio of the average power attenuation of the transmitted signal to the average attenuation threshold and the ratio of the number of branches of the transmission path to the number of branches threshold is used as the first transmission accumulation feature.

[0059] The ratio of the number of transmitted signals received by the target to a threshold number of transmitted signals is used as the second transmission accumulation feature.

[0060] The first transmission accumulation feature and the second transmission accumulation feature are weighted and summed to determine the transmission accumulation characterization value.

[0061] Specifically, in actual signal transmission, the power consumption of the transmitted signal during its successive transmission through several devices can more intuitively reflect the degree of linear loss in transmission. The number of branches in the transmission path can further quantify the risk of multipath interference. The combination of the two more clearly reflects the potential interference risk to the target object caused by the transmission status. Therefore, in implementation, the transmission characteristics of the transmitted signal corresponding to a single transmission are given priority, namely the average power attenuation at each stage and the number of branches in the transmission path. Thus, the first cumulative transmission characteristic calculated based on the transmission characteristics is given a slightly higher weight. Therefore, when performing weighted summation, the weight of the first cumulative transmission characteristic is set to 0.6, and the weight of the second cumulative transmission characteristic is set to 0.4.

[0062] In this embodiment, the purpose of setting the attenuation average threshold, branch number threshold, and transmitted signal number threshold is to characterize the situation where the transmission environment state of a single transmission has a high potential aggravation of the nonlinearity of the target body. By acquiring the transmission data of the transmission signal corresponding to several single transmissions, calling the historical data of the average attenuation of the transmission signal power, the historical data of the number of branches in the transmission path, and the historical data of the number of transmission signals received by the target body, the average value of the attenuation average, the average value of the number of branches, and the average value of the number of transmission signals are calculated. Based on the purpose of setting the above three thresholds, the attenuation average threshold is determined to be the product of the average value of the attenuation average and the attenuation deviation coefficient, the branch number threshold is determined to be the product of the average number of branches and the branch deviation coefficient, and the transmitted signal number threshold is determined to be the product of the average number of transmission signals and the number deviation coefficient. The attenuation deviation coefficient is selected in the interval [1.1, 1.15], the branch deviation coefficient is selected in the interval [1.2, 1.25], and the number deviation coefficient is selected in the interval [1.1, 1.2].

[0063] It is understandable that the transmitted signal passes through several devices one by one along the transmission path. The power consumption between two adjacent devices along the transmission path is taken as the power attenuation at each stage. Then, the power attenuation at each stage of the transmitted signal from the beginning of transmission to several pre-amplifier devices is calculated, and the average value of the power attenuation at each stage is determined. This will not be elaborated further.

[0064] Specifically, this invention sets up a cumulative analysis module to dynamically correlate and quantify the transmission environment and nonlinear distortion, taking into account the impact of the transmission environment on the transmission signal, and further reflecting the potential interference degree of the transmission signal on the nonlinear distortion of the target. In actual practice, during the transmission process, the transmission signal will pass through several devices one by one according to the predetermined transmission path. Based on the power loss of each device in the transmission path, the linear loss degree of the transmission path is quantitatively evaluated. For example, if the power loss of the transmission signal is severe, it may lead to a weakening of the input signal of the power amplifier, exacerbating the degree of nonlinear distortion. By counting the number of branches in the transmission path, the number of signal splitters and couplers nodes is counted to quantify the risk of multipath interference and characterize the path complexity of a single transmission. For example, too many branches will introduce phase noise, such as group delay differences, which will further exacerbate the nonlinearity of the target.

[0065] Meanwhile, the number of signals received in a single transmission can reflect the target body, that is, the instantaneous load state of the power amplifier. For example, receiving too many signals may cause the amplifier to be instantaneously overloaded, approaching the saturation region, and causing nonlinear distortion.

[0066] Therefore, by comprehensively considering the above characteristics, this invention determines the cumulative transmission characterization value to characterize the potential aggravation of nonlinear distortion of the target body by a single transmission condition, providing data support for subsequent labeling of single transmissions. This invention can more comprehensively and accurately dynamically assess the degree of nonlinear distortion of the target body.

[0067] Specifically, please refer to Figure 2 As shown, this is a logic decision diagram for marking a single transmission according to an embodiment of the present invention. The cumulative analysis module is used to mark the single transmission, including:

[0068] If the cumulative transmission characteristic value of the transmitted signal is greater than or equal to the cumulative transmission characteristic threshold, then the corresponding single transmission is marked.

[0069] If the cumulative transmission characteristic value of the transmitted signal is less than the cumulative transmission characteristic threshold, then there is no need to mark the corresponding single transmission.

[0070] The transmission accumulation characterization threshold is selected within the interval [1.67, 1.82].

[0071] Specifically, the stability evaluation module is used to analyze and process the transmission signal of the single transmission, including:

[0072] If any single transmission is marked, the transmission signal of that single transmission is analyzed and processed.

[0073] Specifically, please refer to Figure 3 As shown, this is a logic diagram for determining whether a temperature abrupt change occurs during a single transmission, according to an embodiment of the present invention. The stability evaluation module is used to determine whether a temperature abrupt change occurs during the single transmission, including:

[0074] Used to obtain the slope of the time-domain curve of the temperature change of the target body at several moments;

[0075] If there exists a slope greater than or equal to a slope threshold at any given moment, then it is determined that a temperature abrupt change occurred during the single transmission.

[0076] In this embodiment, the time-domain curve of the temperature change of the target body is constructed as follows:

[0077] Construct a rectangular coordinate system with time as the horizontal axis and target body temperature as the vertical axis;

[0078] The coordinates of the target body temperature at each moment are marked in the rectangular coordinate system;

[0079] Connect the coordinate points with a smooth curve to obtain the time-domain curve of the temperature change;

[0080] Specifically, there are no restrictions on the method for constructing the time-domain curve of the temperature change. For example, the time-domain curve can be fitted using Matlab correlation fitting software, which will not be elaborated here.

[0081] Specifically, the purpose of setting a slope threshold is to characterize the abnormal temperature rise of the target body during signal transmission. By acquiring the transmission data of the transmission signal corresponding to several completed single transmissions, calling the historical slope data corresponding to the moment when there is a temperature change in a single transmission, solving the average slope value, and determining the average slope value as the slope threshold based on the purpose of setting the slope threshold.

[0082] Specifically, the stability evaluation module is used to calculate the distortion tendency characterization parameters of the single transmission, including:

[0083] The ratio of the nonlinear error spillover to the spillover threshold is used as the first distortion tendency feature;

[0084] The ratio of the target body's saturation signal margin to the saturation signal margin threshold is used as the second distortion tendency feature.

[0085] The sum of the first distortion tendency feature and the second distortion tendency feature is used as the distortion tendency characterization parameter.

[0086] In this embodiment, the purpose of setting the overflow threshold and the saturation signal margin threshold is to characterize the situation where the nonlinear distortion of the target body is more severe due to interference. By acquiring the transmission data of the transmission signal corresponding to several single transmissions, calling the historical data of the nonlinear error overflow of the target body and the historical data of the saturation signal margin of the target body, the average overflow value and the average saturation signal margin are calculated. Based on the purpose of setting the above two thresholds, the overflow threshold is determined as the product of the average overflow value and the overflow deviation coefficient, and the saturation signal margin threshold is determined as the product of the average saturation signal margin and the margin deviation coefficient. The overflow deviation coefficient is selected in the interval [1.1, 1.15], and the margin deviation coefficient is selected in the interval [1.15, 1.2].

[0087] Specifically, nonlinearity is a characteristic of power amplifiers, meaning that there is no strict linear relationship between the output signal and the input signal of the power amplifier. This nonlinear relationship can lead to signal distortion and affect the quality and efficiency of the transmitted signal. In practice, the nonlinearity error spillover is the amount of carrier power that exceeds the allowable range of the transmitted signal.

[0088] The allowable range is usually specified by the system design specifications and standards. In practice, when the carrier power exceeds the allowable range, the nonlinear characteristics of the power amplifier will be more obvious, resulting in gain compression and severe harmonic distortion. Therefore, those skilled in the art can determine in advance the range boundary that will cause severe harmonic distortion in the output signal of the power amplifier, and thus determine the allowable range.

[0089] Harmonic distortion refers to the ratio of the total power of harmonic components in the output signal to the fundamental power. Generally, harmonic distortion exceeding 1% is considered severe harmonic distortion. Of course, those skilled in the art can modify it according to actual applications, which will not be elaborated here.

[0090] It is understandable that the output power of the power amplifier no longer increases linearly with the input power, that is, it reaches the working saturation state of the power amplifier. This is one of the core manifestations of the nonlinear characteristics of the amplifier. Based on this, in this embodiment, the amount of signal that has not yet been transmitted through the power amplifier after the power amplifier reaches the working saturation state is determined as the target body saturation signal margin. This will not be elaborated further.

[0091] Specifically, this invention includes a stability evaluation module that analyzes and processes the transmission signal corresponding to the marked single transmission. A pre-compensation mechanism is used to compensate the signal amplitude to correct gain fluctuations in the transmission path. Phase compensation eliminates group delay differences, thereby eliminating linear distortion interference and ensuring that the subsequently extracted nonlinear error spillover more accurately reflects the nonlinear characteristics of the target. Based on this, the temperature change of the target is used as a starting point to construct a time-domain curve of the target's temperature change, calculates the instantaneous slope at several corresponding moments, and identifies abnormal temperature rises in the target. Sudden temperature changes are often accompanied by deterioration of the device's nonlinear characteristics, thus accurately capturing the target's distortion critical state. The degree of nonlinear distortion of the target is quantified by the nonlinear error spillover. Correspondingly, the target's saturation signal margin can assess the severity of exceeding the target's operating saturation state. Furthermore, this invention calculates distortion tendency characterization parameters for a single transmission to characterize the severity of the target's nonlinear distortion, providing data support for subsequent evaluation of whether the corresponding transmission signal is an abnormal signal. This invention can more comprehensively and accurately dynamically evaluate the degree of nonlinear distortion of the target.

[0092] Specifically, please refer to Figure 4 As shown, this is a logic diagram for evaluating whether a transmitted signal is an abnormal signal according to an embodiment of the present invention. The stability evaluation module is used to evaluate whether the transmitted signal is an abnormal signal, including:

[0093] If the distortion tendency characterization parameter of a single transmission is greater than or equal to the distortion tendency characterization parameter threshold, then the corresponding transmission signal is evaluated as the abnormal signal.

[0094] The threshold value for the distortion tendency characterization parameter is selected within the range [2.18, 2.25].

[0095] Specifically, the feedback warning module responds to the evaluation result of the stability evaluation module, including:

[0096] If the stability assessment module determines that the transmitted signal is abnormal, a warning message will be issued.

[0097] Specifically, the stability assessment module is used to pre-calibrate the signal compensation for the single transmission, including compensating for the signal amplitude and phase.

[0098] Specifically, for compensation of signal amplitude and phase, the S-parameters and time-domain response can be measured using a vector analyzer to calibrate the amplitude and phase of the transmitted signal.

[0099] Specifically, the feedback warning module is used to issue warning information including signal amplitude and phase.

[0100] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A nonlinear characteristic measurement system based on a vector analyzer, characterized in that, include: The signal transmitting module is used to control the transmitting end to transmit several transmission signals; A transmission acquisition module, which is connected to the signal transmission module, is used to acquire the transmission data of the transmission signal and extract the transmission characteristics of the transmission signal corresponding to a single transmission. The transmission characteristics include the average power attenuation at each stage and the number of branches in the transmission path. The cumulative analysis module, which is connected to the transmission acquisition module, is used to determine the cumulative transmission characterization value of the transmission signal based on the transmission characteristics and the number of transmission signals received by the target body, so as to mark the single transmission. A stability assessment module, connected to the cumulative analysis module, is used to analyze and process the transmission signal of the single transmission based on the marking results of the cumulative analysis module, including: The signal compensation calibration is performed on the single transmission in advance. After the signal compensation calibration, the temperature change time-domain curve of the target body is constructed. It is determined whether there is a temperature change moment in the single transmission. The complete characteristics of the transmission signal corresponding to the temperature change moment are obtained. The distortion tendency characterization parameter of the single transmission is calculated to evaluate whether the transmission signal is an abnormal signal. The feedback and early warning module is connected to the stability assessment module and issues early warning information in response to the assessment results of the stability assessment module. The complete features include nonlinear error spillover and target saturation signal margin.

2. The nonlinear characteristic measurement system based on a vector analyzer according to claim 1, characterized in that, The cumulative analysis module is used to determine the cumulative transmission characteristic value of the transmitted signal, including: The sum of the ratio of the average power attenuation of the transmitted signal to the average attenuation threshold and the ratio of the number of branches of the transmission path to the number of branches threshold is used as the first transmission accumulation feature. The ratio of the number of transmitted signals received by the target to a threshold number of transmitted signals is used as the second transmission accumulation feature. The first transmission accumulation feature and the second transmission accumulation feature are weighted and summed to determine the transmission accumulation characterization value.

3. The nonlinear characteristic measurement system based on a vector analyzer according to claim 2, characterized in that, The cumulative analysis module is used to mark the single transmission, including: If the cumulative transmission characteristic value of the transmitted signal is greater than or equal to the cumulative transmission characteristic threshold, then the corresponding single transmission is marked.

4. The nonlinear characteristic measurement system based on a vector analyzer according to claim 3, characterized in that, The stability assessment module is used to analyze and process the transmission signal of the single transmission, including: If any single transmission is marked, the transmission signal of that single transmission is analyzed and processed.

5. The nonlinear characteristic measurement system based on a vector analyzer according to claim 1, characterized in that, The stability assessment module is used to determine whether a temperature abrupt change occurs during the single transmission, including: Used to obtain the slope of the time-domain curve of the temperature change of the target body at several moments; If there exists a slope greater than or equal to a slope threshold at any given moment, then it is determined that a temperature abrupt change occurred during the single transmission.

6. The nonlinear characteristic measurement system based on a vector analyzer according to claim 1, characterized in that, The stability evaluation module is used to calculate the distortion tendency characterization parameters of the single transmission, including: The ratio of the nonlinear error spillover to the spillover threshold is used as the first distortion tendency feature; The ratio of the target body's saturation signal margin to the saturation signal margin threshold is used as the second distortion tendency feature. The sum of the first distortion tendency feature and the second distortion tendency feature is used as the distortion tendency characterization parameter.

7. The nonlinear characteristic measurement system based on a vector analyzer according to claim 6, characterized in that, The stability assessment module is used to assess whether the transmitted signal is an abnormal signal, including: If the distortion tendency characterization parameter of a single transmission is greater than or equal to the distortion tendency characterization parameter threshold, then the corresponding transmission signal is evaluated as the abnormal signal.

8. The nonlinear characteristic measurement system based on a vector analyzer according to claim 7, characterized in that, The feedback early warning module responds to the evaluation result of the stability evaluation module, including: If the stability assessment module determines that the transmitted signal is abnormal, a warning message will be issued.

9. The nonlinear characteristic measurement system based on a vector analyzer according to claim 1, characterized in that, The stability assessment module is used to pre-calibrate the signal compensation for the single transmission, including compensating for the signal amplitude and phase.

10. The nonlinear characteristic measurement system based on a vector analyzer according to claim 1, characterized in that, The feedback warning module is used to issue warning information, including signal amplitude and phase.

Images