Satellite data transmission antenna tracking test system and method

Abstract

The invention provides a satellite data transmission antenna tracking test system and method, and the system comprises a data transmission antenna rotation simulator, attitude and orbit control dynamics equipment, a GNSS simulator, measurement and control link equipment, telemetering analysis equipment, and tracking deviation measurement and calculation equipment. According to the invention, the correctness of a data transmission antenna tracking algorithm realized by cooperative work of satellite-borne equipment such as a satellite-borne computer and a mechanism driver can be tested, the deviation between a theoretical calculation result of the data transmission antenna tracking algorithm and an engineering actual measurement result is obtained, and the index conformity of tracking pointing deviation is verified. And a communication link can be accurately established and maintained when data transmission is carried out between the satellite and a ground station after the satellite is launched into an orbit.

Description

Technical Field

[0001] The present invention relates to the field of spacecraft testing technology, and in particular to a satellite data transmission antenna tracking test system and method. Background Art

[0002] During the in-orbit flight, the remote sensing satellite transmits remote sensing data to the ground station through the onboard data transmission antenna. When the satellite enters the visible orbit segment of the ground station, the onboard computer runs the data transmission antenna tracking algorithm to control the data transmission antenna to point to the ground station and establish a wireless transmission link with the ground station. During the flight in the visible orbit segment, the data transmission antenna is controlled to track the ground station to maintain the wireless transmission link with the ground station.

[0003] With the development of satellite-to-ground communication technology and the increasing demand for massive data transmission, satellite-borne data transmission antennas are developing towards high gain, high precision pointing and tracking. Whether the satellite-borne data transmission antenna can accurately track and point to the ground station is an important factor affecting the transmission of satellite-to-ground data transmission. In order to ensure the effectiveness and reliability of the satellite-to-ground data transmission link during the satellite's in-orbit flight, the engineering implementation effect of the data transmission antenna tracking algorithm needs to be verified during the satellite ground test, including the coordinated work of satellite-borne equipment such as satellite-borne computers and mechanism drivers to achieve the correctness of the data transmission antenna tracking function and the tracking pointing accuracy.

[0004] The invention patent with publication number CN106301511A discloses a satellite-borne data transmission antenna to ground relay transmission system and its control method, which can increase the data transmission time between the satellite and the ground, so that a large amount of satellite data can be transmitted to the ground in time. The invention describes a method for a digital transmission antenna to relay tracking of a ground station, but does not support the verification function of the digital transmission antenna tracking algorithm and tracking effect.

[0005] At present, no other descriptions or reports of similar related technologies have been found, and no other similar information at home or abroad has been collected.

[0006] Therefore, a satellite data transmission antenna tracking test system is needed to solve the above problems. Summary of the invention

[0007] In view of the defects in the prior art, the object of the present invention is to provide a satellite data transmission antenna tracking test system and method.

[0008] A satellite data transmission antenna tracking test system provided by the present invention comprises: a data transmission antenna rotation simulator, an attitude and orbit control dynamics device, a GNSS simulator, a measurement and control link device, a telemetry analysis device, and a tracking deviation measurement device;

[0009] The digital transmission antenna rotation simulator is connected to the satellite, receives the digital control antenna driving signal, and returns the rotation angle telemetry signal of the digital transmission antenna;

[0010] The attitude and orbit control dynamics equipment is connected to the satellite and the GNSS simulator respectively to perform satellite dynamics and kinematics simulation calculations, and send flight parameters to the GNSS simulator;

[0011] The GNSS simulator is connected to the satellite, generates a navigation simulation signal according to the flight parameters, and sends it to the satellite;

[0012] The measurement and control link equipment is connected to the satellite, processes the satellite downlink telemetry signal, and outputs the satellite telemetry frame data to the telemetry analysis equipment;

[0013] The telemetry analysis device is connected to the measurement and control link device to analyze satellite telemetry frame data and transmit the telemetry analysis result to the tracking deviation measurement device;

[0014] The tracking deviation measuring device is connected to the telemetry analysis device, receives the telemetry analysis result, extracts the measured data in the digital antenna tracking process and compares it with the theoretical calculated data, calculates the tracking deviation and evaluates whether it meets the predetermined indicators.

[0015] Preferably, the digital transmission antenna rotation simulator is used to simulate the mechanical rotation function of the onboard digital transmission antenna in the X-axis and Y-axis directions, and return the rotation angle telemetry signals of the digital transmission antenna in the X-axis and Y-axis directions.

[0016] Preferably, the attitude and orbit control dynamics device outputs an excitation signal to the sensor of the satellite attitude and orbit control subsystem according to the simulation initial value set by the user, and collects the output signals of the thruster and reaction flywheel actuator of the satellite attitude and orbit control subsystem, performs satellite dynamics and kinematics simulation calculations, and realizes the simulation of the satellite's in-orbit flight process.

[0017] Preferably, the measurement and control link device receives a satellite downlink telemetry signal, performs power attenuation, down-conversion, and demodulation on the satellite downlink telemetry signal, and then outputs satellite telemetry frame data, and sends the satellite telemetry frame data to the telemetry analysis device;

[0018] The telemetry analysis device receives satellite telemetry frame data, performs telemetry frame analysis, telemetry packet extraction, telemetry channel segmentation and telemetry physical quantity conversion processing in sequence, and sends the converted telemetry physical quantity data to the tracking deviation measurement device.

[0019] Preferably, the extracting measured data of the data transmission antenna tracking process includes:

[0020] According to the telemetry code, the "digital transmission antenna working mode", "digital transmission antenna X-axis pointing angle", "digital transmission antenna Y-axis pointing angle" and the corresponding "satellite system time" telemetry are retrieved from the satellite telemetry physical quantity data, and the telemetry status of the "digital transmission antenna working mode" is judged. When the telemetry status of the "digital transmission antenna working mode" changes from "stop and hold" to "tracking mode", the "digital transmission antenna X-axis pointing angle", "digital transmission antenna Y-axis pointing angle" and the corresponding "satellite system time" telemetry values ​​are continuously recorded until the telemetry status of the "digital transmission antenna working mode" changes from "tracking mode" to "stop and hold", then the recording is stopped.

[0021] Preferably, the method for calculating the tracking deviation by the tracking deviation measuring device includes:

[0022] The measured data of the digital antenna tracking process and the theoretical calculation data of the digital antenna tracking algorithm program are aligned in time, and the measured data and the theoretical calculation data at the same time are differenced to finally obtain the pointing time angle deviation sequence.

[0023] Preferably, the evaluation of whether the predetermined indicator is met includes:

[0024] The X-axis pointing angle deviation and the Y-axis pointing angle deviation in the pointing time angle deviation sequence are compared with the digital transmission antenna tracking accuracy index set by the user. If the X-axis pointing angle deviation and the Y-axis pointing angle deviation are both not greater than the digital transmission antenna tracking accuracy index, the test is judged to meet the requirements; otherwise, the test is judged to not meet the requirements.

[0025] Preferably, the attitude and orbit control dynamics device sends satellite flight parameters to the GNSS simulator at set intervals; the GNSS simulator generates a navigation simulation signal in real time according to the received flight parameters, and the time in the navigation simulation signal is consistent with the time of the attitude and orbit control dynamics device; after the satellite receives the navigation simulation signal, it calculates the time and performs time synchronization on the satellite master control computer, and sets the satellite onboard system time to be consistent with the time in the GNSS navigation simulation signal.

[0026] A test method for a satellite data transmission antenna tracking test system provided by the present invention comprises:

[0027] Step S1, the satellite and the test system are powered on, and the initial simulation values ​​of the attitude and orbit control dynamics equipment are set, and the initial simulation values ​​are consistent with the initial orbit parameters of the calculation example of the digital antenna tracking algorithm program for a certain ground station and a certain orbit segment;

[0028] Step S2, the GNSS simulator receives the satellite flight parameters and generates a corresponding navigation simulation signal. The satellite calculates the time according to the navigation simulation signal and synchronizes it to the satellite onboard system time;

[0029] Step S3, synchronously starting the closed-loop operation of the attitude and orbit control dynamics equipment and the wheel-controlled flight mode of the satellite attitude and orbit control subsystem, and starting the simulation of the on-orbit flight process of the satellite under test;

[0030] Step S4, sending a data transmission antenna tracking task program control instruction package to the satellite master control computer, the ground station and data transmission antenna tracking start and end time specified in the instruction package are consistent with the ground station and data transmission antenna tracking start and end time in step S1;

[0031] Step S4, the satellite master control computer executes the digital antenna tracking task according to the onboard system time program control, runs the digital antenna to ground station tracking program during the task execution, and drives the digital antenna rotation simulator to rotate on the X-axis and Y-axis through the digital antenna mechanism driver.

[0032] Step S5, after the execution of the program-controlled instruction package of the digital antenna tracking task is completed, the tracking deviation measurement equipment completes the measured data recording of the digital antenna tracking process, and performs difference calculation between the measured data and the theoretical calculation data of the pre-entered digital antenna tracking algorithm program to generate the tracking deviation measurement result and the tracking deviation index compliance judgment result.

[0033] Preferably, during the data transmission antenna tracking test, all ground stations used during the in-orbit flight are traversed, and a visible orbit segment is selected for each ground station to perform the test of steps S1 to S5. If the tracking deviations generated by the test meet the index requirements, it is determined that the data transmission antenna tracking function and program of the tested satellite meet the requirements; otherwise, it is determined that the data transmission antenna tracking function and program of the tested satellite do not meet the requirements.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention can test the correctness of the digital antenna tracking algorithm implemented by the collaborative work of onboard computers, mechanism drivers and other onboard equipment, obtain the deviation between the theoretical calculation results of the digital antenna tracking algorithm and the engineering measured results, verify the index conformity of the tracking pointing deviation, and ensure that the communication link can be accurately established and maintained when the satellite is transmitted data with the ground station after being launched into orbit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 The block diagram of the satellite data transmission antenna tracking test system is invented. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] The embodiment of the present invention provides a satellite data transmission antenna tracking test system, referring to Figure 1 As shown, the system specifically includes: a digital antenna rotation simulator, an attitude and orbit control dynamics device, a GNSS simulator, a measurement and control link device, a telemetry analysis device, and a tracking deviation measurement device. The digital antenna rotation simulator simulates the mechanical rotation of the antenna and feeds back the rotation angle; the attitude and orbit control dynamics device simulates the satellite's in-orbit flight process and provides flight parameters to the GNSS simulator; the GNSS simulator generates navigation signals to the satellite GNSS receiver based on these parameters; the measurement and control link device processes the downlink telemetry signal and outputs the telemetry frame data; the telemetry analysis device analyzes these data and converts them into physical quantities; finally, the tracking deviation measurement device analyzes the deviation between the measured data and the theoretical calculated data, evaluates the tracking accuracy, and ensures that the satellite can accurately establish and maintain the data transmission link with the ground station after launch. This system is used to verify the correctness of the digital antenna tracking algorithm under the coordinated work of the onboard computer, mechanism driver and other equipment, and ensure that the communication link with the ground station can be accurately established and maintained during the in-orbit flight.

[0040] The following is an explanation of this system:

[0041] Digital antenna rotation simulator: It is connected to the satellite digital antenna mechanism driver through a low-frequency cable. On the one hand, it receives the driving signal output by the satellite digital antenna mechanism driver to simulate the mechanical rotation function of the on-board digital antenna in the X-axis and Y-axis directions; on the other hand, it returns the telemetry signal of the rotation angle of the digital antenna in the X-axis and Y-axis to the on-board digital antenna drive controller.

[0042] Attitude and orbit control dynamics equipment: On the one hand, it is connected to the satellite attitude and orbit control subsystem through a low-frequency cable, and according to the simulation initial value set by the user, it outputs excitation signals to the sensors of the satellite attitude and orbit control subsystem, and collects the output signals of the actuators such as the thrusters and reaction flywheels of the satellite attitude and orbit control subsystem, and performs satellite dynamics and kinematics simulation calculations to realize the simulation of the satellite's in-orbit flight process; on the other hand, it is connected to the GNSS simulator through a local area network, and sends flight parameters such as satellite position, attitude and corresponding time to the GNSS simulator in real time.

[0043] GNSS simulator: On the one hand, it is connected to the attitude and orbit control dynamics equipment through the local area network, and generates corresponding navigation simulation signals in real time according to the satellite position, attitude and time sent by the attitude and orbit control dynamics equipment; on the other hand, it is connected to the satellite GNSS receiver in a wired manner through a radio frequency cable or in a wireless manner through a radio frequency cable, a ground GNSS transmitting antenna, and a satellite-borne GNSS receiving antenna, and sends navigation simulation signals to the satellite GNSS receiver.

[0044] Measurement and control link equipment: connected to the satellite measurement and control transponder via RF cable in wired mode or via RF cable, ground measurement and control antenna, satellite-borne measurement and control antenna in wireless mode, receives satellite downlink telemetry signals, performs power attenuation, down-conversion, demodulation and other processing on the satellite downlink telemetry signals, and then outputs satellite telemetry frame data; connected to the telemetry analysis equipment via the local area network, and sends the satellite telemetry frame data to the telemetry analysis equipment.

[0045] Telemetry analysis equipment: It is connected to the measurement and control link equipment and the tracking deviation calculation equipment through the local area network, receives the satellite telemetry frame data sent by the measurement and control link equipment, and performs telemetry frame analysis, telemetry packet extraction, telemetry channel segmentation and telemetry physical quantity conversion in sequence, and sends the converted telemetry physical quantity data to the tracking deviation calculation equipment.

[0046] Tracking deviation measurement equipment: connected to the telemetry analysis equipment through the local area network, continuously receives satellite telemetry physical quantity data, and extracts the measured data of the digital antenna tracking process; compares the measured data with the theoretical calculation data of the digital antenna tracking algorithm program, calculates the tracking deviation, and makes indicator compliance judgment on the tracking deviation.

[0047] The tracking deviation calculation device in the present invention extracts the measured data of the digital antenna tracking process in the following manner: retrieve the "digital antenna working mode", "digital antenna X-axis pointing angle", "digital antenna Y-axis pointing angle" and the corresponding "satellite system time" telemetry from the satellite telemetry physical quantity data according to the telemetry code, and judge the telemetry state of the "digital antenna working mode". When the telemetry state of the "digital antenna working mode" changes from "stop and hold" to "tracking mode", start to continuously record the "digital antenna X-axis pointing angle", "digital antenna Y-axis pointing angle" and the corresponding "satellite system time" telemetry values ​​until the telemetry state of the "digital antenna working mode" changes from "tracking mode" to "stop and hold", stop recording, and the finally formed measured data has the same format as the theoretical calculation data of the digital antenna tracking algorithm program, which are all pointing time angle sequences (t, X, Y) in the digital antenna tracking process, wherein t is the satellite system time, X is the digital antenna X-axis pointing angle, and Y is the digital antenna Y-axis pointing angle.

[0048] In a specific implementation, the tracking deviation measuring device calculates the tracking deviation by aligning the measured data of the digital antenna tracking process with the theoretical calculation data of the digital antenna tracking algorithm program according to time t, performing difference operation on the measured data and the theoretical calculation data at the same time, and finally obtaining a pointing time angle deviation sequence (t, ΔX, ΔY), wherein t is the satellite system time, ΔX is the absolute value of the difference between the measured value and the theoretical calculation value of the X-axis pointing angle of the digital antenna at the same time, and ΔX is the absolute value of the difference between the measured value and the theoretical calculation value of the Y-axis pointing angle of the digital antenna at the same time.

[0049] In a specific implementation, the process of the tracking deviation measurement device for determining the conformity of the tracking deviation is: comparing the X-axis pointing angle deviation ΔX and the Y-axis pointing angle deviation ΔY in the pointing time angle deviation sequence (t, ΔX, ΔY) with the digital antenna tracking accuracy index set by the user one by one; if the X-axis pointing angle deviation ΔX and the Y-axis pointing angle deviation ΔY are both not greater than the digital antenna tracking accuracy index, then it is determined that this test meets the requirements; if there is an X-axis pointing angle deviation ΔX or a Y-axis pointing angle deviation ΔY that is greater than the digital antenna tracking accuracy index, then it is determined that this test does not meet the requirements, and the out-of-tolerance pointing time angle deviation data (t, ΔX, ΔY) is extracted as a .csv file.

[0050] During the operation of this system, the time synchronization process is as follows: the attitude and orbit control dynamics device sends flight parameters such as satellite position, attitude and corresponding time to the GNSS simulator every 100ms; the GNSS simulator generates a navigation simulation signal in real time according to the received flight parameters, and the time in the navigation simulation signal is consistent with the time of the attitude and orbit control dynamics device; the satellite GNSS receiver receives the navigation simulation signal generated by the GNSS simulator, calculates the time, and synchronizes the satellite master control computer, setting the satellite on-board system time to be consistent with the time in the GNSS navigation simulation signal, thereby achieving synchronization between the simulation time of the satellite on-orbit flight process in the attitude and orbit control dynamics device and the on-board system time of the satellite being tested.

[0051] The present invention also provides a test method for a satellite data transmission antenna tracking test system, comprising the following steps:

[0052] Step S1, after the satellite and the test system are powered on, the initial simulation values ​​of the attitude and orbit control dynamics equipment are set, and the initial simulation values ​​are consistent with the initial orbit parameters of the calculation example of the digital antenna tracking algorithm program for a certain ground station and a certain orbit segment;

[0053] Step S2, the GNSS simulator receives the satellite flight parameters sent by the attitude and orbit control dynamics device, generates a corresponding navigation simulation signal, and sends it to the satellite GNSS receiver. After the GNSS receiver calculates the time, it sends a GNSS timing instruction to set the satellite onboard system time to be synchronized with the GNSS navigation simulation signal time and the attitude and orbit control dynamics device simulation time;

[0054] Step S3, synchronously starting the closed-loop operation of the attitude and orbit control dynamics equipment and the wheel-controlled flight mode of the satellite attitude and orbit control subsystem, and starting the simulation of the on-orbit flight process of the satellite under test;

[0055] Step S4, sending a data transmission antenna tracking task program control instruction package to the satellite master control computer, the ground station and data transmission antenna tracking start and end time specified in the instruction package are consistent with the ground station and data transmission antenna tracking start and end time in the calculation example described in step S1;

[0056] Step S4, the satellite master control computer executes the digital antenna tracking task according to the onboard system time program control, runs the digital antenna to ground station tracking program during the task execution, and drives the digital antenna rotation simulator to rotate on the X-axis and Y-axis through the digital antenna mechanism driver.

[0057] Step S5, after the execution of the program-controlled instruction package of the digital antenna tracking task is completed, the tracking deviation measurement equipment completes the measured data recording of the digital antenna tracking process, and performs difference calculation between the measured data and the theoretical calculation data of the pre-entered digital antenna tracking algorithm program to generate the tracking deviation measurement result and the tracking deviation index compliance judgment result.

[0058] Based on the above method, when conducting the data transmission antenna tracking test, it is necessary to traverse all the ground stations used during the in-orbit flight, that is, a visible orbit segment is selected for each ground station to perform the test of steps S1 to S5. If the tracking deviations generated by the test meet the index requirements, it is determined that the data transmission antenna tracking function and program of the satellite under test meet the requirements.

[0059] The satellite data transmission antenna tracking test system and method provided in the embodiment of the present invention can test the correctness of the data transmission antenna tracking algorithm implemented by the coordinated work of on-board computers, mechanism drivers and other on-board equipment, and obtain the deviation between the theoretical calculation results of the data transmission antenna tracking algorithm and the engineering measurement results, verify the indicator compliance of the tracking pointing deviation, and ensure that the communication link can be accurately established and maintained when the satellite is transmitted data with the ground station after being launched into orbit.

[0060] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0061] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A satellite data transmission antenna tracking test system, characterized in that: include: Digital transmission antenna rotation simulator, attitude and orbit control dynamics equipment, GNSS simulator, measurement and control link equipment, telemetry analysis equipment, and tracking deviation measurement equipment; The digital transmission antenna rotation simulator is connected to the satellite, receives the digital control antenna driving signal, and returns the rotation angle telemetry signal of the digital transmission antenna; The attitude and orbit control dynamics equipment is connected to the satellite and the GNSS simulator respectively to perform satellite dynamics and kinematics simulation calculations, and send flight parameters to the GNSS simulator; The GNSS simulator is connected to the satellite, generates a navigation simulation signal according to the flight parameters, and sends it to the satellite; The measurement and control link equipment is connected to the satellite, processes the satellite downlink telemetry signal, and outputs the satellite telemetry frame data to the telemetry analysis equipment; The telemetry analysis device is connected to the measurement and control link device to analyze satellite telemetry frame data and transmit the telemetry analysis result to the tracking deviation measurement device; The tracking deviation measuring device is connected to the telemetry analysis device, receives the telemetry analysis result, extracts the measured data in the digital antenna tracking process and compares it with the theoretical calculated data, calculates the tracking deviation and evaluates whether it meets the predetermined indicators.

2. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The digital transmission antenna rotation simulator is used to simulate the mechanical rotation function of the satellite digital transmission antenna in the X-axis and Y-axis directions, and return the rotation angle telemetry signals of the digital transmission antenna in the X-axis and Y-axis directions.

3. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The attitude and orbit control dynamics device outputs an excitation signal to the sensor of the satellite attitude and orbit control subsystem according to the simulation initial value set by the user, and collects the output signals of the thruster and reaction flywheel actuator of the satellite attitude and orbit control subsystem, performs satellite dynamics and kinematics simulation calculations, and realizes the simulation of the satellite's in-orbit flight process.

4. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The measurement and control link device receives the satellite downlink telemetry signal, performs power attenuation, down-conversion, and demodulation on the satellite downlink telemetry signal, and then outputs satellite telemetry frame data, and sends the satellite telemetry frame data to the telemetry analysis device; The telemetry analysis device receives satellite telemetry frame data, performs telemetry frame analysis, telemetry packet extraction, telemetry channel segmentation and telemetry physical quantity conversion processing in sequence, and sends the converted telemetry physical quantity data to the tracking deviation measurement device.

5. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The extraction of measured data of the data transmission antenna tracking process includes: According to the telemetry code, the "digital transmission antenna working mode", "digital transmission antenna X-axis pointing angle", "digital transmission antenna Y-axis pointing angle" and the corresponding "satellite system time" telemetry are retrieved from the satellite telemetry physical quantity data, and the telemetry state of the "digital transmission antenna working mode" is judged. When the telemetry state of the "digital transmission antenna working mode" changes from "stop and hold" to "tracking mode", the telemetry values ​​of the "digital transmission antenna X-axis pointing angle", "digital transmission antenna Y-axis pointing angle" and the corresponding "satellite system time" are continuously recorded until the telemetry state of the "digital transmission antenna working mode" changes from "tracking mode" to "stop and hold", then the recording is stopped.

6. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The method for calculating the tracking deviation by the tracking deviation measuring device includes: The measured data of the digital antenna tracking process and the theoretical calculation data of the digital antenna tracking algorithm program are aligned in time, and the measured data and the theoretical calculation data at the same time are differenced to finally obtain the pointing time angle deviation sequence.

7. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: Whether the assessment meets the predetermined indicators includes: The X-axis pointing angle deviation and the Y-axis pointing angle deviation in the pointing time angle deviation sequence are compared with the digital transmission antenna tracking accuracy index set by the user. If the X-axis pointing angle deviation and the Y-axis pointing angle deviation are both not greater than the digital transmission antenna tracking accuracy index, the test is judged to meet the requirements; otherwise, the test is judged to not meet the requirements.

8. The satellite data transmission antenna tracking test system according to claim 1, characterized in that: The attitude and orbit control dynamics device sends satellite flight parameters to the GNSS simulator at set intervals; the GNSS simulator generates a navigation simulation signal in real time according to the received flight parameters, and the time in the navigation simulation signal is consistent with the time of the attitude and orbit control dynamics device; after the satellite receives the navigation simulation signal, it calculates the time and synchronizes the satellite master control computer, and sets the satellite onboard system time to be consistent with the time in the GNSS navigation simulation signal.

9. A test method for a satellite data transmission antenna tracking test system, based on the satellite data transmission antenna tracking test system according to any one of claims 1 to 8, characterized in that: include: Step S1, the satellite and the test system are powered on, and the initial simulation values ​​of the attitude and orbit control dynamics equipment are set, and the initial simulation values ​​are consistent with the initial orbit parameters of the calculation example of the digital antenna tracking algorithm program for a certain ground station and a certain orbit segment; Step S2, the GNSS simulator receives the satellite flight parameters and generates a corresponding navigation simulation signal. The satellite calculates the time according to the navigation simulation signal and synchronizes it to the satellite onboard system time; Step S3, synchronously starting the closed-loop operation of the attitude and orbit control dynamics equipment and the wheel-controlled flight mode of the satellite attitude and orbit control subsystem, and starting the simulation of the on-orbit flight process of the satellite under test; Step S4, sending a data transmission antenna tracking task program control instruction package to the satellite master control computer, the ground station and data transmission antenna tracking start and end time specified in the instruction package are consistent with the ground station and data transmission antenna tracking start and end time in step S1; Step S4, the satellite master control computer executes the digital antenna tracking task according to the onboard system time program control, runs the digital antenna to ground station tracking program during the task execution, and drives the digital antenna rotation simulator to rotate on the X-axis and Y-axis through the digital antenna mechanism driver. Step S5, after the execution of the program-controlled instruction package of the digital antenna tracking task is completed, the tracking deviation measurement equipment completes the measured data recording of the digital antenna tracking process, and performs difference calculation between the measured data and the theoretical calculation data of the pre-entered digital antenna tracking algorithm program to generate the tracking deviation measurement result and the tracking deviation index compliance judgment result.

10. The test method of the satellite data transmission antenna tracking test system according to claim 9, characterized in that: During the data transmission antenna tracking test, all ground stations used during in-orbit flight are traversed, and a visible orbit segment is selected for each ground station to perform tests in steps S1 to S5. If the tracking deviations generated by the test meet the index requirements, it is determined that the data transmission antenna tracking function and program of the tested satellite meet the requirements; otherwise, it is determined that the data transmission antenna tracking function and program of the tested satellite do not meet the requirements.

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