Receiving performance evaluation method for aerospace ground measurement and control system

Abstract

The invention relates to the technical field of spaceflight measurement and control communication, in particular to a receiving performance evaluation method for a spaceflight ground measurement and control system. The method comprises the steps of task data acquisition and preprocessing, G / T value time sequence calculation, multi-dimensional receiving performance evaluation, evaluation conclusion generation and the like, and realizes multi-dimensional evaluation of index dimension, capability dimension and trend dimension. A quantitative and qualitative aerospace ground measurement and control system receiving performance evaluation conclusion is formed and comprises a qualitative evaluation conclusion (normal, decline and deterioration), a quantitative score F (score 0-100) and a trend evaluation conclusion (decline and deterioration estimation date: T2), an image-text evaluation report is formed, and decision-making assistance is provided for equipment scheduling use and repair maintenance.

Description

Technical Field

[0001] This invention relates to the field of aerospace telemetry, tracking, and communication technology, specifically a method for evaluating the receiving performance of aerospace ground telemetry, tracking, and communication systems. Background Technology

[0002] In recent years, with the vigorous development of my country's aerospace industry, the construction of aerospace ground tracking and control systems has also experienced explosive growth. This has made it difficult to meet the maintenance needs of the large number of newly built ground stations using traditional manual inspection methods. Higher demands have been placed on the automated evaluation of aerospace ground tracking and control systems to achieve a shift from extensive to precise deployment of maintenance resources. The receiving capability of aerospace ground tracking and control systems is a fundamental capability for performing tasks such as spacecraft telemetry and data transmission reception; therefore, the evaluation of the receiving performance of aerospace ground tracking and control systems is one of the key elements of system evaluation.

[0003] The receiving performance of aerospace ground telemetry and control systems is primarily measured by the quality factor, defined as the ratio of antenna receiving gain to system noise-temperature ratio, i.e., the G / T value. During equipment use, as components age, the system's receiving performance gradually declines. Therefore, accurately assessing the current state and future trend of the system's quality factor is crucial, enabling equipment users and maintenance personnel to promptly grasp the equipment's status, perform timely maintenance, and ensure long-term stable operation.

[0004] Currently, research on evaluation methods for the receiving performance of aerospace ground telemetry and control systems mainly focuses on the accurate measurement of the quality factor. A series of methods have been proposed, including the carrier-to-noise ratio method, the radio source method, the indirect method, and the comparison method, achieving high-precision measurement of the system's quality factor with an accuracy of ±0.2 dB. However, effective evaluation methods are lacking for assessing whether the system can meet the receiving performance requirements during actual missions, whether the time-series fluctuations of the quality factor are stable, and its long-term trend. Evaluation still largely relies on the experience-based estimations of equipment users based on the current state, making it difficult to form accurate evaluation conclusions that can guide subsequent maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide a method for evaluating the receiving performance of an aerospace ground telemetry and control system, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for evaluating the receiving performance of an aerospace ground telemetry and control system includes the following steps: Step S1: The aerospace ground telemetry and control system monitoring subsystem acquires the satellite telemetry and control mission measurement data required for the evaluation, performs data preprocessing on the mission measurement data, and collects the data preprocessing results to form a time series evaluation sample; Step S2: Calculate and generate a time series sequence of G / T values ​​from the time series evaluation samples; Step S3: Based on the calculated G / T value time series and task indicator requirements, evaluate the indicator dimensions and obtain qualitative evaluation conclusions; Step S4: Evaluate the capability dimension based on the G / T value time series and qualitative evaluation conclusions to obtain a quantitative score of the system's receiving capability; Step S5: After obtaining qualitative and quantitative reception performance evaluation results through indicator dimension and capability dimension evaluation respectively, further infer the subsequent development trend by using historical and current evaluation results, conduct trend dimension evaluation, and obtain trend evaluation conclusion. Step S6: Summarize the evaluation results of the indicator dimension, capability dimension, and trend dimension to form a comprehensive evaluation conclusion of the aerospace ground telemetry and control system receiving performance, including qualitative evaluation conclusion, quantitative score, and trend evaluation conclusion, and present it to the user in a graphical way to provide the user with receiving performance evaluation support information for equipment use scheduling, maintenance, and repair.

[0007] Preferably, the actual test data of the task in step S1 includes: Task execution process data, including received signal-to-noise ratio, ranging data, and task time; Mission parameters include mission frequency, satellite EIRP, satellite downlink modulation bandwidth, operating mode, and operating frequency band.

[0008] Preferably, the data preprocessing in step S1 specifically includes: Set a filtering threshold to filter the received signal-to-noise ratio and ranging data by elevation angle; Configure a threshold range to remove outliers from the received signal-to-noise ratio and ranging data; Set the interpolation frequency to perform timing interpolation and alignment on the received signal-to-noise ratio and ranging data.

[0009] Preferably, step S2 specifically includes: S21. The G / T value time series is calculated using the carrier-to-noise ratio method. The calculation formula is as follows: (1); (2); In equation (1), This represents the signal-to-noise ratio parameter in a standard measurement and control system. This indicates the EIRP value for satellite downlink transmission, which is taken as the same value throughout the entire evaluation period; This represents the free space loss of the transmission link; In equation (2), This represents the signal-to-noise ratio parameter in spread spectrum or data transmission mode; BW represents the downlink modulation signal bandwidth of the satellite. Free space loss of transmission link The calculation formula is: (3); In equation (3), R This represents the straight-line distance from the satellite to the ground station, taken as the ranging distance from the mission data. f This indicates the satellite downlink frequency, i.e., the mission frequency. S22. Using equations (1) to (3), calculate the timing evaluation sample for each frame to obtain the timing sequence of G / T measurement values. Then, correct the G / T value according to the task frequency band and task frequency point. cal The time series value is calculated using the following formula: (4); In equation (4), f 0 The nominal center frequency of the mission band is indicated; the S-band is taken as... f 0 The frequency is 2200MHz, and the X band is selected as follows. f 0 It is 8400MHz.

[0010] Preferably, step S3 specifically includes: S31. Configure task indicator requirements and decision rules; the task indicator requirements configuration includes the normal range, decline range and deterioration range of the task indicator, and the decision rule configuration includes the duration of exceeding the limit, the number of times exceeding the limit, and the proportion of exceeding the limit; S32. After completing the relevant configuration, the time sequence of G / T values ​​calculated in step S2 is analyzed frame by frame to determine whether the data of each frame of G / T value is in the normal range, the decreasing range, or the deterioration range. S33. When the data of the G / T value is determined to be in the decreasing range or the deterioration range, record the duration of this state. When the duration exceeds the configured over-limit duration, record it as one instance of indicator decrease or indicator deterioration, and record the relevant time period. S34. After interpreting the full sequence data of the G / T value time series, extract all periods when the indicators decreased or deteriorated, count the number of times the indicators decreased or deteriorated, and the proportion of the periods and the total data duration. S35. If the number of times or the proportion of times the statistics are exceeded, the qualitative assessment conclusion of the task indicator for that task is determined to be a decline or deterioration; otherwise, the qualitative assessment conclusion is normal.

[0011] Preferably, step S4 specifically includes: S41. Based on the qualitative evaluation conclusion of step S3, make preliminary segmentation limits on the quantitative score of receiving capability. S42. Based on the G / T value time series obtained in step S2, calculate the mean of the G / T value time series. μAs a characterization of the system's receiving sensitivity; calculate the standard deviation of the G / T value time series. σ , as a characterization of the system's reception stability; Within the defined fractional range, the quantization score F of the system's receiving capability is further calculated using the following formula: (5); In equation (5), F min , F max These represent the minimum and maximum scores defined for each segment; G / T max、 G / T min These represent the maximum and minimum G / T values ​​for the corresponding segments, respectively; θ This represents the stability correction factor, which is manually configured to perform fractional correction of the receiver stability. σ 1 This indicates the preset standard deviation, which is set separately for different segments.

[0012] Preferably, step S5 specifically includes: The mean G / T value is used as a key feature to characterize the system's receiving capability. Using the mean G / T value data from multiple missions on different dates, a fitting function is selected for curve fitting, and the subsequent trend of the mean G / T value is deduced. The date when it changes to a decrease or deteriorates is predicted as the trend assessment conclusion.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a method for evaluating the receiving performance of aerospace ground telemetry and control systems. Using actual measurement data from satellite telemetry and control missions, the receiving performance of aerospace ground telemetry and control systems is evaluated from the dimensions of indicators, capabilities, and trends. Qualitative and quantitative evaluation conclusions are formed to help equipment users and maintenance personnel fully understand the equipment status, improve the reliability of equipment in performing missions, and support the continuous improvement of equipment scheduling, use, and health management. Attached Figure Description

[0014] Figure 1 This is an overall flowchart of a method for evaluating the receiving performance of an aerospace ground telemetry and control system according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the evaluation of indicator dimensions in an embodiment of the present invention; Figure 3 This is a flowchart illustrating the capability dimension assessment in an embodiment of the present invention; Figure 4 This is a flowchart illustrating the trend dimension evaluation in an embodiment of the present invention. Detailed Implementation

[0015] The technical solutions of 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.

[0016] Figure 1 This invention provides an overall flowchart of a method for evaluating the receiving performance of an aerospace ground telemetry and control system. (See attached flowchart.) Figure 1 As shown, the embodiments of the present invention provide a method for evaluating the receiving performance of an aerospace ground telemetry and control system, including the following steps: Step S1: The aerospace ground telemetry and control system monitoring subsystem acquires the satellite telemetry and control mission measurement data required for the evaluation, performs data preprocessing on the mission measurement data, and collects the data preprocessing results to form a time series evaluation sample; Step S2: Calculate and generate a time series sequence of G / T values ​​from the time series evaluation samples; Step S3: Based on the calculated G / T value time series and task indicator requirements, evaluate the indicator dimensions and obtain qualitative evaluation conclusions; Step S4: Evaluate the capability dimension based on the G / T value time series and qualitative evaluation conclusions to obtain a quantitative score of the system's receiving capability; Step S5: After obtaining qualitative and quantitative reception performance evaluation results through indicator dimension and capability dimension evaluation respectively, further infer the subsequent development trend by using historical and current evaluation results, conduct trend dimension evaluation, and obtain trend evaluation conclusion. Step S6: Summarize the evaluation results of the indicator dimension, capability dimension, and trend dimension to form a comprehensive evaluation conclusion of the aerospace ground telemetry and control system receiving performance, including qualitative evaluation conclusion, quantitative score, and trend evaluation conclusion, and present it to the user in a graphical way to provide the user with receiving performance evaluation support information for equipment use scheduling, maintenance, and repair.

[0017] The aerospace ground telemetry and control system receiving performance evaluation method provided by the embodiments of the present invention includes a full-process processing method for aerospace ground telemetry and control system receiving performance evaluation, including steps such as mission data acquisition and preprocessing, G / T value time series calculation, multi-dimensional receiving performance evaluation, and evaluation conclusion generation. It realizes multi-dimensional evaluation of indicator dimensions, capability dimensions, and trend dimensions, and generates graphic evaluation reports to provide decision-making assistance for equipment scheduling, use, maintenance and repair.

[0018] Specifically, in one embodiment of the present invention, the actual test data of the task in step S1 includes: Task execution process data, including received signal-to-noise ratio, ranging data, and task time; Mission parameters include mission frequency, satellite EIRP, satellite downlink modulation bandwidth, operating mode, and operating frequency band.

[0019] Furthermore, in one embodiment of the present invention, the data preprocessing in step S1 specifically includes: Set a filtering threshold to filter the received signal-to-noise ratio and ranging data by elevation angle; the filtering threshold is set to 5°, that is, if the elevation angle in the acquired data frame is less than 5°, the relevant data is discarded and not included in the time series evaluation sample. Configure threshold ranges to remove outliers from received signal-to-noise ratio (SNR) and ranging data; configure threshold ranges for received SNR and ranging data based on satellite transit orbit data, mission parameters, etc., and interpret relevant data in the acquired data frames. If the data exceeds the threshold range, the corresponding data is discarded and not included in the time series evaluation sample; the threshold range for ranging data is set to the theoretical orbit ±30km, and the threshold range for SNR is set to 40~70dBHz. An interpolation frequency is set to perform timing interpolation and alignment on the received signal-to-noise ratio and ranging data. Due to data omissions and discards, the timing evaluation sample data may have missing data or inconsistent timescales within the evaluation period. This means that some time periods may be missing data, or the timescales of different parameters in the same frame may be inconsistent. Therefore, timing interpolation and alignment are necessary to ensure timing consistency in subsequent processing. An interpolation frequency of 20Hz is set for data interpolation and alignment, which involves interpolating and calculating 20 frames of data per second from the original acquired data, ensuring that the timescales of different parameters in the same frame are consistent.

[0020] In one embodiment of the present invention, step S2 specifically includes: S21. The G / T value time series is calculated using the carrier-to-noise ratio method. The calculation formula is as follows: (1); (2); Equation (1) gives the calculation of the G / T value timing sequence in the standard measurement and control system, and Equation (2) gives the calculation of the G / T value timing sequence in the spread spectrum system or data transmission mode. In equation (1), This represents the signal-to-noise ratio parameter in a standard measurement and control system. This indicates the EIRP value for satellite downlink transmission, which is taken as the same value throughout the entire evaluation period; This represents the free space loss of the transmission link; In equation (2), This represents the signal-to-noise ratio parameter in spread spectrum or data transmission mode; BW represents the downlink modulation signal bandwidth of the satellite. Free space loss of transmission link The calculation formula is: (3); In equation (3), R This represents the straight-line distance from the satellite to the ground station, taken as the ranging distance from the mission data. f This indicates the satellite downlink frequency, i.e., the mission frequency. S22. Using equations (1) to (3), calculate the timing evaluation sample for each frame to obtain the timing sequence of G / T measurement values. Then, correct the G / T value according to the task frequency band and task frequency point. cal The time series value is calculated using the following formula: (4); In equation (4), f 0 The nominal center frequency of the mission band is indicated; the S-band is taken as... f 0 The frequency is 2200MHz, and the X band is selected as follows. f 0 It is 8400MHz.

[0021] Figure 2 This is a flowchart illustrating the evaluation of indicator dimensions in an embodiment of the present invention. In one embodiment of the present invention, such as... Figure 2 As shown, step S3 specifically includes: S31. Configure task indicator requirements and decision rules; the task indicator requirements configuration includes the normal range, decline range and deterioration range of the task indicator, and the decision rule configuration includes the duration of exceeding the limit, the number of times exceeding the limit, and the proportion of exceeding the limit; Specifically, in the embodiments of the present invention, the S-band reception performance requirements are configured as follows: Normal range: G / T ≥ 21 dB / K; Decrease range: 19 dB / K ≤ G / T < 21 dB / K; Deterioration range: G / T < 19 dB / K; The S-band reception compliance decision rules are configured as follows: Duration of exceeding the limit: T≥2s; Number of times exceeding the limit: N≥2; Exceeding limit percentage: R ≥ 10%; S32. After completing the relevant configuration, the time sequence of G / T values ​​calculated in step S2 is analyzed frame by frame to determine whether the data of each frame of G / T value is in the normal range, the decreasing range, or the deterioration range. S33. When the data of the G / T value is determined to be in the decreasing range or the deterioration range, record the duration of this state. When the duration exceeds the configured over-limit duration, record it as one instance of indicator decrease or indicator deterioration, and record the relevant time period. S34. After interpreting the full sequence data of the G / T value time series, extract all periods when the indicators decreased or deteriorated, count the number of times the indicators decreased or deteriorated, and the proportion of the periods and the total data duration. S35. If the number of times or the proportion of times the statistics are exceeded, the qualitative assessment conclusion of the task indicator for that task is determined to be a decline or deterioration; otherwise, the qualitative assessment conclusion is normal.

[0022] The embodiments of the present invention provide a method for evaluating the receiving performance of a space ground telemetry and control system. In terms of the evaluation dimensions, the method configures specific mission indicator requirements and indicator compliance judgment rules, judges whether the receiving quality of the current mission meets the mission indicator requirements according to the configuration rules, and performs a qualitative analysis on the mission indicator achievement capability of the equipment.

[0023] Figure 3 This is a flowchart illustrating the capability dimension assessment in an embodiment of the present invention. In one embodiment of the present invention, such as... Figure 3 As shown, step S4 specifically includes: S41. Based on the qualitative evaluation conclusion of step S3, make preliminary segmentation limits on the quantitative score of receiving capability. Specifically, in the embodiments of the present invention, the three qualitative assessment conclusions of normal, declining, and deteriorating indicators are segmented and limited by scores, as follows: Normal range: 80-100; Indicator decline: 60-80; Indicator deterioration: 0~60; S42. Based on the G / T value time series obtained in step S2, calculate the mean of the G / T value time series. μ As a characterization of the system's receiving sensitivity; calculate the standard deviation of the G / T value time series. σ , as a characterization of the system's reception stability; Within the defined fractional range, the quantization score F of the system's receiving capability is further calculated using the following formula: (5); In equation (5), F min , F max These represent the minimum and maximum scores defined for each segment; G / T max、 G / T min These represent the maximum and minimum G / T values ​​for the corresponding segments, respectively; θ This represents the stability correction factor, which is manually configured to perform fractional correction of the receiver stability. σ 1 This indicates the preset standard deviation, which is set separately for different segments.

[0024] The embodiments of the present invention provide a method for evaluating the receiving performance of a space ground telemetry and control system. In terms of capability evaluation dimensions, the method characterizes the receiving sensitivity and stability of the system mission process by calculating statistical characteristics such as the mean and standard deviation of the G / T value time series, and quantifies the above characteristics into a quantitative score F of the system's receiving capability.

[0025] Figure 4 This is a flowchart illustrating the trend dimension assessment in an embodiment of the present invention. In one embodiment of the present invention, such as... Figure 4 As shown, step S5 specifically includes: The mean G / T value is used as a key feature to characterize the system's receiving capability. Using the mean G / T value data from multiple missions on different dates, a fitting function is selected for curve fitting, and the subsequent trend of the mean G / T value is deduced. The date when it changes to a decrease or deteriorates is predicted as the trend assessment conclusion.

[0026] like Figure 4 As shown, the mean value of measured G / T values ​​from period T0 to T1 is used as the fitting sample data. A fitting function is selected; in this embodiment, a second-order or third-order polynomial fitting function is used for curve fitting to extrapolate the mean change of G / T values ​​after period T1. A threshold for decline or deterioration is set. The date T2 corresponding to when the fitting result of the mean G / T value changes to the threshold is the estimated date of decline or deterioration in the trend dimension assessment.

[0027] The embodiments of the present invention provide a method for evaluating the receiving performance of a space ground telemetry and control system. In terms of trend evaluation, the method collects the statistical characteristics of G / T values ​​from multiple mission measurement data of the system, forms a time series point set according to the mission execution time, and uses curve fitting to extrapolate the subsequent change trend of the characteristic data to determine whether the system receiving performance has a significant downward trend in the short term, and obtains the estimated date T2 of the decline or deterioration state.

[0028] This invention integrates the evaluation results of comprehensive indicator dimensions, capability dimensions, and trend dimensions to form quantitative and qualitative evaluation conclusions of the receiving performance of aerospace ground telemetry and control systems. These conclusions include qualitative evaluation conclusions (normal, declining, deteriorating), quantitative scores F (0~100), and trend evaluation conclusions (estimated date of decline / deterioration: T2). The invention also generates a graphic evaluation report to provide users with receiving performance evaluation support information for equipment usage scheduling, maintenance, and repair.

[0029] The present invention provides a method for evaluating the receiving performance of aerospace ground telemetry and control systems. Using actual measurement data from satellite telemetry and control missions, the receiving performance of aerospace ground telemetry and control systems is evaluated from the dimensions of indicators, capabilities, and trends. Qualitative and quantitative evaluation conclusions are formed to help equipment users and maintenance personnel fully understand the equipment status, improve the reliability of equipment in performing missions, and support the continuous improvement of equipment scheduling, use, and health management.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for evaluating the receiving performance of an aerospace ground telemetry and control system, characterized in that, Includes the following steps: Step S1: The aerospace ground telemetry and control system monitoring subsystem acquires the satellite telemetry and control mission measurement data required for the evaluation, performs data preprocessing on the mission measurement data, and collects the data preprocessing results to form a time series evaluation sample; Step S2: Calculate and generate a time series sequence of G / T values ​​from the time series evaluation samples; Step S3: Based on the calculated G / T value time series and task indicator requirements, evaluate the indicator dimensions and obtain qualitative evaluation conclusions; Step S4: Evaluate the capability dimension based on the G / T value time series and qualitative evaluation conclusions to obtain a quantitative score of the system's receiving capability; Step S5: After obtaining qualitative and quantitative reception performance evaluation results through indicator dimension and capability dimension evaluation respectively, further infer the subsequent development trend by using historical and current evaluation results, conduct trend dimension evaluation, and obtain trend evaluation conclusion. Step S06: Summarize the evaluation results of the indicator dimension, capability dimension, and trend dimension to form a comprehensive evaluation conclusion of the aerospace ground telemetry and control system receiving performance, including qualitative evaluation conclusion, quantitative score, and trend evaluation conclusion, and present it to the user in a graphical way to provide the user with receiving performance evaluation support information for equipment use scheduling, maintenance, and repair.

2. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 1, characterized in that, The actual test data for the task mentioned in step S1 includes: Task execution process data, including received signal-to-noise ratio, ranging data, and task time; Mission parameters include mission frequency, satellite EIRP, satellite downlink modulation bandwidth, operating mode, and operating frequency band.

3. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 2, characterized in that, The data preprocessing described in step S1 specifically includes: Set a filtering threshold to filter the received signal-to-noise ratio and ranging data by elevation angle; Configure a threshold range to remove outliers from the received signal-to-noise ratio and ranging data; Set the interpolation frequency to perform timing interpolation and alignment on the received signal-to-noise ratio and ranging data.

4. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 3, characterized in that, Step S2 specifically includes: S21. The G / T value time series is calculated using the carrier-to-noise ratio method. The calculation formula is as follows: （1）； （2）； In equation (1), This represents the signal-to-noise ratio parameter in a standard measurement and control system. This indicates the EIRP value for satellite downlink transmission, which is taken as the same value throughout the entire evaluation period; This represents the free space loss of the transmission link; In equation (2), This represents the signal-to-noise ratio parameter in spread spectrum or data transmission mode; BW represents the downlink modulation signal bandwidth of the satellite. Free space loss of transmission link The calculation formula is: （3）； In equation (3), R This represents the straight-line distance from the satellite to the ground station, taken as the ranging distance from the mission data. f This indicates the satellite downlink frequency, i.e., the mission frequency. S22. Using equations (1) to (3), calculate the timing evaluation sample for each frame to obtain the timing sequence of G / T measurement values. Then, correct the G / T value according to the task frequency band and task frequency point. cal The time series value is calculated using the following formula: （4）； In equation (4), f 0 The nominal center frequency of the mission band is indicated; the S-band is taken as... f 0 The frequency is 2200MHz, and the X band is selected as follows. f 0 It is 8400MHz.

5. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 4, characterized in that, Step S3 specifically includes: S31. Configure task indicator requirements and decision rules; the task indicator requirements configuration includes the normal range, decline range and deterioration range of the task indicator, and the decision rule configuration includes the duration of exceeding the limit, the number of times exceeding the limit, and the proportion of exceeding the limit; S32. After completing the relevant configuration, the time sequence of G / T values ​​calculated in step S2 is analyzed frame by frame to determine whether the data of each frame of G / T value is in the normal range, the decreasing range, or the deterioration range. S33. When the data of the G / T value is determined to be in the decreasing range or the deterioration range, record the duration of this state. When the duration exceeds the configured over-limit duration, record it as one instance of indicator decrease or indicator deterioration, and record the relevant time period. S34. After interpreting the full sequence data of the G / T value time series, extract all periods when the indicators decreased or deteriorated, count the number of times the indicators decreased or deteriorated, and the proportion of the periods and the total data duration. S35. If the number of times or the proportion of times the statistics are exceeded, the qualitative assessment conclusion of the task indicator for that task is determined to be a decline or deterioration; otherwise, the qualitative assessment conclusion is normal.

6. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 5, characterized in that, Step S4 specifically includes: S41. Based on the qualitative evaluation conclusion of step S3, make preliminary segmentation limits on the quantitative score of receiving capability. S42. Based on the G / T value time series obtained in step S2, calculate the mean of the G / T value time series. μ As a characterization of the system's receiving sensitivity; calculate the standard deviation of the G / T value time series. σ , as a characterization of the system's reception stability; Within the defined fractional range, the quantization score F of the system's receiving capability is further calculated using the following formula: （5）； In equation (5), F min , F max These represent the minimum and maximum scores defined for each segment; G / T max、 G / T min These represent the maximum and minimum G / T values ​​for the corresponding segments, respectively; θ This represents the stability correction factor, which is manually configured to perform fractional correction of the receiver stability. σ 1 This indicates the preset standard deviation, which is set separately for different segments.

7. The method for evaluating the receiving performance of an aerospace ground telemetry and control system according to claim 6, characterized in that, Step S5 specifically includes: The mean G / T value is used as a key feature to characterize the system's receiving capability. Using the mean G / T value data from multiple missions on different dates, a fitting function is selected for curve fitting, and the subsequent trend of the mean G / T value is deduced. The date when it changes to a decrease or deteriorates is predicted as the trend assessment conclusion.

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