Timing and data broadcasting ground station baseband system

Abstract

The invention discloses a time service and data broadcast ground station baseband system, which is characterized in that a baseband signal processing module receives a baseband downlink intermediate frequency signal and local position information, analyzes the baseband downlink intermediate frequency signal to obtain a first time service message, a first broadcast data message and measurement data, and generates a time service signal; a baseband uplink intermediate frequency signal is generated based on a received second time service message and a second broadcast data message, a time interval measurement module compares a time service signal with a preset time service reference signal to obtain a time service deviation monitoring value, and a monitoring and data processing module analyzes and processes the received first broadcast data message and the first time service message to obtain a time service deviation monitoring value. According to the method and the device, the service of time service, time service performance monitoring, data broadcasting and the like can be simultaneously carried out in the baseband system of the single ground station, and the service of time service, time service performance monitoring, data broadcasting and the like can be realized in the baseband system of the single ground station.

Description

Technical Field

[0001] The present application relates to the fields of satellite communication technology and satellite timing technology, and in particular to a timing and data broadcasting ground station baseband system. Background Art

[0002] Building an integrated space-earth timing system is an important national strategic layout, which plays a fundamental supporting role in economic and social development and national defense construction.

[0003] With the construction of my country's high-precision ground-based timing system, a ground-based timing network is about to be formed. However, there is currently a lack of a timing and data broadcasting ground station baseband system that integrates satellite timing and service performance monitoring, satellite-ground integrated timing information, and timing service performance monitoring information. Summary of the invention

[0004] The main purpose of this application is to provide a timing and data broadcasting ground station baseband system, aiming to solve the technical problems of the timing and data broadcasting ground station baseband system.

[0005] To achieve the above-mentioned objectives, the present application provides a timing and data broadcasting ground station baseband system, including: a baseband signal processing module and a monitoring and data processing module that are communicatively connected, and a time interval measurement module that is communicatively connected to both the baseband signal processing module and the monitoring and data processing module; wherein the baseband signal processing module is used to receive a baseband downlink intermediate frequency signal and local position information, parse and process the baseband downlink intermediate frequency signal to obtain a first timing message, a first broadcast data message and measurement data, generate a timing signal according to the first timing message, the local position information and the measurement data, and send the first broadcast data message, the first timing message and the measurement data. The timing signal, and, based on the received second timing message and the second broadcast data message, generate a baseband uplink intermediate frequency signal, and send the baseband uplink intermediate frequency signal; the time interval measurement module is used to compare the timing signal and the preset timing reference signal, obtain a timing deviation monitoring value, and send the timing deviation monitoring value; the monitoring and data processing module is used to parse and process the received first broadcast data message and the first timing message, obtain the bit error rate, frame error rate and frame loss rate, and output the bit error rate, frame error rate and frame loss rate, and obtain the second timing message and the second broadcast data message, and send the second timing message and the second broadcast data message.

[0006] Optionally, the baseband signal processing module also includes: a first processing submodule and a second processing submodule, and an AD conversion submodule communicatively connected to the first processing submodule, and a DA conversion submodule communicatively connected to the second processing submodule; wherein the AD conversion submodule is used to receive a baseband downlink intermediate frequency signal, perform down-conversion processing on the baseband downlink intermediate frequency signal to obtain a near-zero-frequency digital baseband signal, and output the near-zero-frequency digital baseband signal; the first processing submodule is used to acquire and track the received near-zero-frequency digital baseband signal to obtain a tracking signal, and sequentially perform baseband signal processing on the tracking signal. The first processing submodule is used for performing channel coding, spread spectrum modulation and intermediate frequency carrier modulation processing on the received second timing message and the second broadcast data message in sequence to obtain an uplink intermediate frequency signal, and sends the uplink intermediate frequency signal to the DA conversion submodule; the DA conversion submodule is used for performing digital-to-analog conversion on the received uplink intermediate frequency signal to obtain the baseband uplink intermediate frequency signal.

[0007] Optionally, the baseband signal processing module also includes: a measurement submodule, which is communicatively connected to the first processing submodule, and the measurement submodule is used to parse and process the received satellite downlink loop link signal to obtain the measurement value of the code and carrier deviation, and send the measurement value of the code and carrier deviation to the virtual clock interface; a frequency control submodule, which is communicatively connected to the second processing submodule, and the frequency control module is used to receive the virtual clock information sent by the virtual clock interface, generate frequency control information based on the virtual clock information, modulate the baseband uplink intermediate frequency signal using the frequency control information, and send the modulated baseband uplink intermediate frequency signal.

[0008] Optionally, the system also includes: a filtering and gain control channel module, which is communicatively connected to both the AD conversion submodule and the DA conversion submodule, and the filtering and gain control channel module is used to receive the baseband uplink intermediate frequency signal, filter and power control the baseband uplink intermediate frequency signal to obtain the baseband uplink intermediate frequency signal after power control, and send the baseband uplink intermediate frequency signal after power control to the ground station antenna and radio frequency system, and receive the baseband downlink intermediate frequency signal sent by the ground station antenna and radio frequency system, and filter and power control the baseband downlink intermediate frequency signal to obtain the baseband downlink intermediate frequency signal.

[0009] Optionally, the system further includes: a frequency synthesis module, configured to provide the preset timing reference signal to the baseband signal processing module.

[0010] Optionally, the baseband signal processing module is also used to generate equipment control and status display information based on the operating status, and the monitoring and data processing module includes: a host computer monitoring submodule, used to receive the equipment control and status display information, and send the equipment control and status display information; a data processing and storage submodule, used to store the received timing deviation monitoring value, the first timing telegram, the first broadcast data telegram and the measurement data, perform bit error comparison, frame error statistics, frame loss statistics, obtain the bit error rate, the frame error rate and the frame loss rate, and send the bit error rate, the frame error rate and the frame loss rate.

[0011] Optionally, the monitoring and data processing module further includes: an instruction issuing submodule, which is used to control the state of the baseband signal processing module using parameter commands.

[0012] A timing and data broadcasting ground station baseband system proposed in an embodiment of the present application receives a baseband downlink intermediate frequency signal and local position information through a baseband signal processing module, parses and processes the baseband downlink intermediate frequency signal to obtain a first timing message, a first broadcast data message and measurement data, generates a timing signal according to the first timing message, the local position information and the measurement data, sends a first broadcast data message, the first timing message and the timing signal, and generates a baseband uplink intermediate frequency signal based on the received second timing message and the second broadcast data message, and sends the baseband uplink intermediate frequency signal; The time interval measurement module is used to compare the timing signal with the preset timing reference signal, obtain the timing deviation monitoring value, and send the timing deviation monitoring value; the monitoring and data processing module is used to parse and process the received first broadcast data telegram and the first timing telegram, obtain the bit error rate, frame error rate and frame loss rate, and output the bit error rate, frame error rate and frame loss rate, as well as obtain the second timing telegram and the second broadcast data telegram, and send the second timing telegram and the second broadcast data telegram, thereby realizing the simultaneous timing, timing performance monitoring and data broadcasting services in a single ground station baseband system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A hardware structure block diagram of an embodiment of a timing and data broadcasting ground station baseband system provided for this application;

[0014] Figure 2 A schematic diagram of an embodiment of a timing and data broadcasting ground station baseband system provided for this application;

[0015] Figure 3 An external interface provided for an embodiment of a timing and data broadcasting ground station baseband system of the present application.

[0016] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] The purpose of the present invention is to provide a satellite transponder-based timing and data broadcasting ground station baseband system for completing the generation, transmission and reception processing of timing and data broadcasting signals, and realizing timing services, timing performance monitoring services, and data broadcasting integrated services.

[0019] Reference Figure 1 The first embodiment of the present application provides a timing and data broadcasting ground station baseband system, which may include: a baseband signal processing module 1 and a monitoring and data processing module 2 that are communicatively connected, and a time difference measurement module 3 that is communicatively connected to both the baseband signal processing module 1 and the monitoring and data processing module 2; wherein the baseband signal processing module 1 is used to receive a baseband downlink intermediate frequency signal and local position information, parse and process the baseband downlink intermediate frequency signal, obtain a first timing message, a first broadcast data message and measurement data, generate a timing signal according to the first timing message, the local position information and the measurement data, and send the first broadcast data. The time difference measurement module 3 is used to compare the timing signal with the preset timing reference signal, obtain the timing deviation monitoring value, and send the timing deviation monitoring value; the monitoring and data processing module 2 is used to parse and process the received first broadcast data telegram and the first timing telegram, obtain the bit error rate, frame error rate and frame loss rate, and output the bit error rate, frame error rate and frame loss rate, and obtain the second timing telegram and the second broadcast data telegram, and send the second timing telegram and the second broadcast data telegram.

[0020] Among them, the baseband signal processing module 1 extracts the time delay measurement value (i.e., measurement data) from the first timing message at the same time, demodulates the virtual clock information and ephemeris information obtained from the first timing message, generates a timing signal according to the time delay measurement value, the virtual clock information, and the ephemeris information, and the timing signal can be a timing 1PPS signal, and completes the generation and output of the timing 1PPS signal. The time difference measurement module 3 is used to compare the timing signal with the preset timing reference signal to obtain the timing deviation monitoring value, and sends the timing deviation monitoring value to the monitoring and data processing module 2. Through the above process, the baseband system of the timing and data broadcasting ground station realizes the generation of the timing signal and the detection of the timing deviation, and obtains the timing performance monitoring information. Finally, the baseband signal processing module 1 sends the timing performance monitoring information to the monitoring and data processing software.

[0021] Furthermore, the monitoring and data processing module 2 is a single board computer.

[0022] In an embodiment of the present application, the baseband signal processing module 1 further includes: a first processing submodule 15 and an AD conversion submodule 13 communicatively connected to the first processing submodule 15, wherein the AD conversion submodule 13 is used to receive a baseband downlink intermediate frequency signal, perform down-conversion processing on the baseband downlink intermediate frequency signal, obtain a near-zero-frequency digital baseband signal, and output a near-zero-frequency digital baseband signal;

[0023] Specifically, the AD conversion submodule 13 can perform AD analog-to-digital conversion on the baseband downlink intermediate frequency signal of the satellite downlink loop link, the antenna RF loop signal receiving link or the satellite downlink timing performance monitoring receiving link to obtain a near-zero-frequency digital baseband signal, and send the near-zero-frequency digital baseband signal to the first processing submodule.

[0024] The first processing submodule 15 is used to acquire and track the received near-zero-frequency digital baseband signal, obtain a tracking signal, perform message synchronization, channel decoding, and message extraction processing on the tracking signal in sequence, obtain a first timing message, a first broadcast data message, and measurement data, and send the first timing message and the first broadcast data message to the monitoring and data processing module 2.

[0025] Among them, the first processing submodule 15 is a baseband signal receiving and processing module, which can capture and track the near-zero-frequency digital baseband signal that has been down-converted to obtain a tracking signal, and then perform telegram synchronization, channel decoding, and telegram extraction on the tracking signal to obtain extracted information, and demodulate the extracted information to obtain the first timing telegram and the first broadcast data telegram, and send the first timing telegram and the first broadcast data telegram to the monitoring and data processing module 2.

[0026] In an embodiment of the present application, the baseband signal processing module 1 also includes a second processing submodule and a DA conversion submodule 14 communicatively connected to the second processing submodule; wherein the second processing submodule is used to perform channel coding, spread spectrum modulation and intermediate frequency carrier modulation processing on the received second timing message and the second broadcast data message in sequence to obtain an uplink intermediate frequency signal, and send the uplink intermediate frequency signal to the DA conversion submodule 14; the DA conversion submodule 14 is used to perform digital-to-analog conversion on the received uplink intermediate frequency signal to obtain a baseband uplink intermediate frequency signal.

[0027] Exemplarily, the second processing submodule 16 is a baseband signal generation module, which is used to perform LDPC / convolutional code channel coding, spread spectrum BPSK (10) modulation and intermediate frequency 140MHz carrier modulation on the timing message and broadcast data message sent by the monitoring and data processing module 2, generate a modulated intermediate frequency signal, and then output the analog 140MHz intermediate frequency signal to the filtering and gain control module through the DA conversion submodule.

[0028] In summary, the baseband signal processing module 1 completes information interaction with the monitoring and data processing module 2 through the network interface. The baseband signal processing module 1 receives the second time message and the second broadcast data message sent by the monitoring and data processing module 2, completes encoding, spread spectrum modulation, and intermediate frequency modulation on the second time message and the second broadcast data message, and then outputs an intermediate frequency digital signal. The intermediate frequency digital signal is converted by DA, filtered, and gain controlled to obtain a baseband uplink intermediate frequency signal, and outputs the baseband uplink intermediate frequency signal to the ground station upconverter. After receiving the baseband downlink intermediate frequency signal, the satellite ground station outputs a downlink intermediate frequency signal after downconversion. The downlink intermediate frequency signal is filtered, gain controlled, and AD converted, and then enters the baseband signal processing module 1 to complete signal capture, tracking, decoding, and other processing, and obtains the first time message and the first broadcast data message, and reports the message information to the monitoring and data processing module 2. The baseband signal processing module 1 obtains the ephemeris and virtual clock information by extracting the first timing message, and completes the timing function according to the obtained delay measurement value and local position information, outputs the 1PPS timing signal, and uses the time difference measurement module 3 to measure the deviation information between the 1PPS timing signal and the reference 1PPS, and sends the timing deviation monitoring information to the monitoring and data processing software.

[0029] Furthermore, the function of the baseband signal processing module 1 to generate a 1PPS timing signal by receiving a satellite downlink may be independent of other signal processing functions, and the clock reference signal used by the timing signal is from a different source than the clock reference signal of the signal generation processing function.

[0030] In an embodiment of the present application, the baseband signal processing module 1 also includes a measurement submodule 11 and a frequency control submodule 12, wherein the measurement submodule 11 is communicatively connected to the first processing submodule 15, and the measurement submodule 11 is used to parse and process the received satellite downlink loop link signal to obtain the measurement value of the code and carrier deviation, and send the measurement value of the code and carrier deviation to the virtual clock interface; the frequency control submodule 12 is communicatively connected to the second processing submodule 16, and the frequency control module is used to receive the virtual clock information sent by the virtual clock interface, generate frequency control information based on the virtual clock information, modulate the baseband uplink intermediate frequency signal using the frequency control information, and send the modulated baseband uplink intermediate frequency signal.

[0031] Among them, the baseband signal processing module 1 receives the transmission frequency adjustment amount from the virtual clock software interface, makes a comprehensive judgment based on its own code and carrier deviation measurement value, completes the control of the transmission frequency, and sends the code and carrier deviation measurement value to the virtual clock interface; the frequency control submodule 12 is communicated with the second processing submodule 16, and the frequency control submodule 12 is used to receive the virtual clock information sent by the virtual clock interface, generate frequency control information based on the virtual clock information, modulate the baseband uplink intermediate frequency signal using the frequency control information, and send the modulated baseband uplink intermediate frequency signal, thereby realizing frequency modulation of the baseband uplink intermediate frequency signal and obtaining the final baseband uplink intermediate frequency signal.

[0032] In an embodiment of the present application, the system also includes a filtering and gain control channel module 17, which is communicatively connected to the AD conversion submodule 13 and the DA conversion submodule 14. The filtering and gain control channel module 17 is used to receive a baseband uplink intermediate frequency signal, filter and power control the baseband uplink intermediate frequency signal to obtain a baseband uplink intermediate frequency signal after power control, and send the baseband uplink intermediate frequency signal after power control to the ground station antenna and radio frequency system, as well as receive a baseband downlink intermediate frequency signal sent by the ground station antenna and radio frequency system, and filter and power control the baseband downlink intermediate frequency signal to obtain a baseband downlink intermediate frequency signal after power control.

[0033] Exemplarily, the filtering and gain control module 19 is used to generate an analog intermediate frequency signal according to the baseband signal processing module 1, filter and power control the analog intermediate frequency signal, and send the output 140MHz intermediate frequency signal to the ground station antenna and radio frequency system for transmission. In the satellite downlink loopback link, the antenna radio frequency loopback signal receiving link and the satellite downlink timing performance monitoring receiving link, the filtering and gain control module 19 filters and power controls the intermediate frequency signal output by the ground station antenna and radio frequency system, and sends the 140MHz intermediate frequency analog signal to the baseband signal processing module 1 for processing.

[0034] In an embodiment of the present application, the system further includes a frequency synthesis module 20, which is used to provide a preset timing reference signal to the baseband signal processing module 1. Specifically, the frequency synthesis module 20 is used to generate and distribute the working clocks of each module in the baseband system of the ground station, and provides each module of the baseband system with an external timing reference signal or a working clock from an onboard high-stability crystal oscillator.

[0035] Furthermore, the frequency synthesis module 20 uses an external reference clock or an internal high-stability crystal oscillator as a clock source.

[0036] In an embodiment of the present application, the baseband signal processing module 1 is also used to generate equipment control and status display information based on the operating status, and the monitoring and data processing module 2 includes a host computer monitoring submodule 21 and a data processing and storage submodule 22, wherein the host computer monitoring submodule 21 is used to receive equipment control and status display information, and send equipment control and status display information; the data processing and storage submodule 22 is used to store data, perform bit error comparison, frame error statistics, and frame loss statistics on the received timing deviation monitoring value, the first timing telegram, the first broadcast data telegram, and the measurement data, to obtain the bit error rate, frame error rate, and frame loss rate, and send the bit error rate, frame error rate, and frame loss rate.

[0037] In an embodiment of the present application, the monitoring and data processing module 2 further includes an instruction issuing submodule, which is used to use parameter commands to perform state control on the baseband signal processing module.

[0038] Specifically, the monitoring and data processing module 2 is an interface for realizing local human-computer interaction. The demodulated first timing message, the first broadcast data message and the measurement data are transmitted to the monitoring and data processing module 2 by the baseband signal processing module 1. The monitoring and data processing module 2 completes data storage, error comparison, error frame statistics, frame loss statistics, data display and other operations on the first timing message, the first broadcast data message and the measurement data. The baseband signal processing module 1 packages the device control and status display information and the timing performance monitoring information and actively reports them to the upper computer monitoring submodule 21 of the monitoring and data processing module 2. The upper computer monitoring submodule 21 receives the device control and status display information, and sends the device control and status display information and the timing performance monitoring information to the data management software.

[0039] Reference Figure 3The working principle of the timing and data broadcasting ground station baseband system (hereinafter referred to as the ground station baseband system) is as follows: the ground station baseband system 100 receives the broadcast message from the performance analysis and monitoring subsystem 700, as well as the ephemeris and virtual clock data from the orbit determination data center 200 and the virtual clock software 300, and formats the data through the message editing software 400, modulates it into an intermediate frequency signal and outputs it to the up-converter of the satellite ground station 500. The ground station baseband system 100 receives the downlink intermediate frequency signal output by the down-converter of the satellite ground station 500, and completes the capture, tracking and message demodulation of the intermediate frequency signal, and counts the bit error rate, frame error rate, frame loss rate, etc. of the satellite-based broadcast message. The ground station baseband system 100 measures the delay through the satellite loopback link, and sends the delay measurement result to the virtual clock software 300, and controls the transmission frequency in combination with the frequency adjustment amount generated by the virtual clock software 300 and the delay measurement value of the device itself. The ground station baseband system 100 receives the downlink intermediate frequency signal, extracts the satellite-to-ground delay measurement value, corrects the ephemeris and virtual clock delay, corrects the propagation atmosphere error, etc. to complete the timing function, and outputs the 1PPS timing signal, and measures the time difference information between the 1PPS timing signal and the reference 1PPS. The ground station baseband system 100 outputs the timing deviation monitoring value, bit error rate, frame error rate, frame loss rate and other performance monitoring information to the data management software 600.

[0040] Continue to refer to Figure 3 The ground station time and frequency equipment is traced back to the external time and frequency subsystem, providing 1pps pulse signal and 10MHz frequency signal for the ground station baseband system equipment. The data management software 600 sends the timing performance monitoring information output from the ground station baseband system to the performance analysis and monitoring subsystem 700 to provide external interface services.

[0041] Specifically, refer to Figure 2 , Figure 3 The timing and data broadcasting ground station baseband system can complete the generation of timing signals, the detection of timing deviations, and the data receiving and sending functions through the following steps.

[0042] Step 1: According to the preset workflow, a control command carrying parameters is issued through the monitoring and data processing module 2;

[0043] Step 2: The baseband system of the timing and data broadcasting ground station performs state setting according to the control command, and receives the baseband downlink intermediate frequency signal from the ground station antenna and the radio frequency system through the filtering and gain control module 19;

[0044] Step 3: The message arrangement software 400 outputs the uplink message to the monitoring and data processing module 2. After completing the encoding and modulation of the uplink signal on the baseband signal processing module 1, the baseband uplink intermediate frequency signal is output to the ground station antenna and the radio frequency system and sent out via the antenna;

[0045] Step 4: The baseband signal processing module 1 completes the capture, despreading, demodulation, bit synchronization, frame synchronization, decoding, etc. of the downlink intermediate frequency signal; the demodulated downlink message is output to the message editing software 400 through the monitoring and data processing module 2, and is locally stored and statistically analyzed;

[0046] Step 5: The baseband signal processing module 1 simultaneously extracts the measured values ​​of the code and carrier deviations, sends them to the virtual clock software 300, and stores them locally;

[0047] Step 6: The baseband signal processing module 1 also completes the generation and output of the timing 1PPS signal, and the time difference measurement module 3 performs the time difference measurement to complete the monitoring of the timing performance;

[0048] Step 7, the virtual clock software 300 outputs the adjustment data such as delay and frequency, the baseband signal processing module 1 processes the uplink message in real time, adjusts the transmission signal frequency, outputs the baseband uplink intermediate frequency signal, and then sends the baseband uplink intermediate frequency signal through the ground station antenna and the radio frequency system via the antenna;

[0049] Step eight, the baseband signal processing module 1 reports the parameters and status of the device to the data management software 600 in real time to monitor the task progress.

[0050] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A timing and data broadcasting ground station baseband system, characterized in that: include: A baseband signal processing module and a monitoring and data processing module that are communicatively connected, and a time interval measurement module that is communicatively connected to both the baseband signal processing module and the monitoring and data processing module; The baseband signal processing module is used to receive a baseband downlink intermediate frequency signal and local location information, parse and process the baseband downlink intermediate frequency signal to obtain a first timing message, a first broadcast data message and measurement data, generate a timing signal according to the first timing message, the local location information and the measurement data, send the first broadcast data message, the first timing message and the timing signal, and generate a baseband uplink intermediate frequency signal based on the received second timing message and the second broadcast data message, and send the baseband uplink intermediate frequency signal; The time interval measurement module is used to compare the timing signal with a preset timing reference signal, obtain a timing deviation monitoring value, and send the timing deviation monitoring value; The monitoring and data processing module is used to parse and process the received first broadcast data telegram and the first timing telegram to obtain a bit error rate, a frame error rate and a frame loss rate, and output the bit error rate, the frame error rate and the frame loss rate, and obtain the second timing telegram and the second broadcast data telegram, and send the second timing telegram and the second broadcast data telegram.

2. The timing and data broadcasting ground station baseband system as claimed in claim 1, characterized in that: The baseband signal processing module includes: a first processing submodule and an AD conversion submodule communicatively connected to the first processing submodule; The AD conversion submodule is used to receive the baseband downlink intermediate frequency signal, perform down-conversion processing on the baseband downlink intermediate frequency signal to obtain a near-zero-frequency digital baseband signal, and output the near-zero-frequency digital baseband signal; The first processing submodule is used to acquire and track the received near-zero-frequency digital baseband signal to obtain a tracking signal, and perform message synchronization, channel decoding, and message extraction processing on the tracking signal in sequence to obtain the first timing message, the first broadcast data message, and the measurement data, and send the first timing message and the first broadcast data message to the monitoring and data processing module.

3. The timing and data broadcasting ground station baseband system as claimed in claim 2, characterized in that: The baseband signal processing module further includes: a second processing submodule and a DA conversion submodule communicatively connected to the second processing submodule; The second processing submodule is used to perform channel coding, spread spectrum modulation and intermediate frequency carrier modulation processing on the received second timing message and the second broadcast data message in sequence to obtain an uplink intermediate frequency signal, and send the uplink intermediate frequency signal to the DA conversion submodule; The DA conversion submodule is used to perform digital-to-analog conversion on the received uplink intermediate frequency signal to obtain the baseband uplink intermediate frequency signal.

4. The timing and data broadcasting ground station baseband system as claimed in claim 3, characterized in that: The baseband signal processing module also includes: A measurement submodule, which is in communication with the first processing submodule, and is used to parse and process the received satellite downlink loop link signal to obtain a measurement value of the code and carrier deviation, and send the measurement value of the code and carrier deviation to the virtual clock interface; A frequency control submodule is communicatively connected to the second processing submodule, and the frequency control submodule is used to receive the virtual clock information sent by the virtual clock interface, generate frequency control information based on the virtual clock information, modulate the baseband uplink intermediate frequency signal using the frequency control information, and send the modulated baseband uplink intermediate frequency signal.

5. The timing and data broadcasting ground station baseband system as claimed in claim 3, characterized in that: The system further comprises: The filtering and gain control channel module is communicatively connected with the AD conversion submodule and the DA conversion submodule, and is used to receive the baseband uplink intermediate frequency signal, filter and power control the baseband uplink intermediate frequency signal to obtain the baseband uplink intermediate frequency signal after power control, and send the baseband uplink intermediate frequency signal after power control to the ground station antenna and radio frequency system, and receive the baseband downlink intermediate frequency signal sent by the ground station antenna and radio frequency system, and filter and power control the baseband downlink intermediate frequency signal to obtain the baseband downlink intermediate frequency signal with power control.

6. The timing and data broadcasting ground station baseband system as claimed in claim 1, characterized in that: The system further comprises: The frequency synthesis module is used to provide the preset timing reference signal to the baseband signal processing module.

7. The timing and data broadcasting ground station baseband system as claimed in claim 1, characterized in that: The baseband signal processing module is also used to generate equipment control and status display information based on the operating status, and the monitoring and data processing module also includes: The host computer monitoring submodule is used to receive the device control and status display information and send the device control and status display information; The data processing and storage submodule is used to store the received timing deviation monitoring value, the first timing telegram and the first broadcast data telegram, perform bit error comparison, frame error statistics and frame loss statistics, obtain the bit error rate, the frame error rate and the frame loss rate, and send the bit error rate, the frame error rate and the frame loss rate.

8. The timing and data broadcasting ground station baseband system as claimed in claim 1, characterized in that: The monitoring and data processing module also includes: The instruction issuing submodule is used to use parameter commands to control the state of the baseband signal processing module.

Images