Satellite system for joint improvement of measurement and control data transmission and communication application efficiency

Abstract

The invention belongs to the technical field of low-orbit satellite communication, and discloses a satellite system for jointly improving measurement and control data transmission and communication application efficiency. A control unit is responsible for completing satellite calendar attitude calculation of satellite broadcast, analyzing a satellite working mode switching instruction according to ground station information stored by a storage unit, and then sending the instruction to each module unit; the two baseband processing units both support on-orbit reconstruction and loading, wherein the baseband processing unit A is used for completing measurement and control signal processing or user wide beam access signal processing; the baseband processing unit B is used for completing communication service signal processing or data transmission signal processing; the two up-conversion units respectively carry out up-conversion processing on a service link signal and a measurement and control link signal in the signal processing module, and the two down-conversion units respectively receive signals of the phased array transceiver antenna and the wide beam transceiver antenna and complete down-conversion processing. The measurement and control link can support a satellite measurement and control function and a communication wide beam access function in a time-sharing manner.

Description

Technical Field

[0001] The present invention relates to the field of low-orbit satellite communication technology, and in particular to a satellite system that jointly improves measurement, control, data transmission and communication application efficiency. Background Art

[0002] With the rapid development of low-orbit satellite Internet, satellites are increasingly used in communications, remote sensing, monitoring and other fields. However, there are many problems that need to be solved in the current satellite system: First, the measurement and control link and the communication link are independent of each other and have single functions, resulting in low resource utilization. The measurement and control link is mainly used for command injection and telemetry transmission, and the communication link only undertakes data transmission tasks and cannot flexibly switch functions according to actual needs. Second, in order to realize multiple functions such as satellite measurement and control, broadband communication, and data transmission, different and independent payloads are usually required, which not only increases the weight and cost of the satellite, but also makes it difficult to achieve satellite lightweighting. Third, in the face of complex and changing space environments and diverse mission requirements, the traditional satellite link mode cannot adjust the working mode in real time, and it is difficult to efficiently complete multiple data transmission tasks. For example, when the satellite orbit changes or the ground station moves, it is impossible to optimize the link function in time to ensure the stability of communication and the efficiency of data transmission. In addition, limited satellite payload resources and the huge pressure on the ground operation and maintenance center also put forward higher requirements on the autonomous decision-making and flexible response capabilities of the satellite system. Therefore, it is of great practical significance to develop a satellite system and method that can effectively improve the performance of measurement, control, data transmission and communication applications. Summary of the invention

[0003] The present invention aims to provide a satellite system that improves the efficiency of measurement, control, data transmission and communication applications, so that the satellite can adjust the working mode in real time according to the real-time status and the position of the ground station, optimize the functional integration capability of the measurement and control link and the communication link, improve the system resource utilization and task adaptability, and thus improve the overall application efficiency of the satellite system. The measurement and control link can support satellite measurement and control functions and communication wide beam access functions in time-sharing; the communication link staring mode can support one or more functions of data transmission and on-line measurement and control, and communication and broadcast distribution in agile mode.

[0004] The present invention achieves the above effects through the following technical solutions: A satellite system that jointly improves the performance of measurement, control, data transmission and communication applications, characterized in that it includes a signal processing module, a frequency conversion module, a phased array transceiver antenna, and a wide-beam transceiver antenna.

[0005] Signal processing module: The signal processing module includes a data storage unit, a control unit and two baseband processing units; the control unit is responsible for completing the ephemeris and attitude calculation of the satellite broadcast, and parsing the satellite working mode switching instruction based on the ground station information stored in the storage unit, and then sending the instruction to the frequency conversion module, phased array transceiver antenna, and wide beam transceiver antenna; both baseband processing units support on-orbit reconstruction and loading, among which baseband processing unit A is used to complete the measurement and control signal processing or user wide beam access signal processing; baseband processing unit B is used to complete the communication service signal processing or data transmission signal processing; Frequency conversion module: The frequency conversion module includes two frequency conversion channels; both frequency conversion channels include an up-conversion unit and a down-conversion unit; the two up-conversion units respectively perform up-conversion processing on the service link signal and the measurement and control link signal in the signal processing module, and then send the processed signals to the phased array transceiver antenna and the wide-beam transceiver antenna respectively; the two down-conversion units respectively receive the signals from the phased array transceiver antenna and the wide-beam transceiver antenna, complete the down-conversion processing, and then send the processed signals to the signal processing module.

[0006] The phased array transceiver antenna can receive radio signals and send them to the frequency conversion channel for down-conversion processing, and at the same time receive the up-converted signals from the frequency conversion channel and radiate the signals.

[0007] The wide beam transceiver antenna receives the radio signal and sends it to the frequency conversion channel for down-conversion processing, while receiving the up-conversion signal of the frequency conversion channel and radiating the signal.

[0008] The satellite senses its own attitude, orbital parameters, and equipment operating status in real time, and obtains and stores the location information of all ground stations. Based on the real-time sensing information and location information, the control unit in the satellite signal processing module generates instructions to adjust the working mode of the communication link. The adjustment process is as follows: If the satellite enters the communication service area, and the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna are in the off state, the control unit generates an instruction to power on the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna; the baseband processing unit B in the signal processing module is turned on to load the service software version program, and the phased array transceiver antenna works in the beam hopping mode; while the baseband processing unit B is communicating with the service, it reads the broadcast information in the data storage module and sends it; during operation, the control unit monitors the service beam traffic; if the average value of the beam traffic of the satellite in the service area is less than the threshold within a certain period of time or is about to leave the planned service area, the control unit controls the baseband processing unit B to initiate traffic switching, and the traffic of the satellite is landed through the neighboring satellite; after the traffic switching is completed, the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna are shut down individually; If the satellite signal processing module control unit determines that a link can be established with the data transmission station, and the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are in the shutdown state; the control unit generates an instruction to control the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna to power on; the phased array antenna works in the staring mode, the baseband processing unit B loads the data transmission software version, and opens the data storage unit; after the control is completed, the stored data is downloaded; during the transmission process, the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna receive the reception status reported by the ground data transmission station, and the satellite performs adaptive rate adjustment based on this; after the data storage unit data is completed, the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna enter the shutdown state.

[0009] Wide beam tracking and control link communication process: The control unit in the satellite signal processing module generates a mode instruction by reading the ground station position parameters stored in the data storage module and combining the real-time satellite position and attitude broadcast by the satellite platform; on this basis, the signal processing module, frequency conversion channel, wide beam transceiver antenna, phased array antenna, etc. are powered on and off and the software version is loaded; If the satellite signal processing module control unit determines that a link can be established with the tracking and control station, the baseband signal unit A, the frequency conversion channel A, and the wide beam transceiver antenna are powered on; the signal processing module loads the tracking and control program and performs tracking and control link establishment; when the satellite is about to leave the tracking and control station, it determines the next visible signal gateway time T; if the time T is greater than the specified value Ts, the control unit generates a mode switching instruction and starts timing T1; The baseband signal processing unit of the satellite signal processing module is loaded with wide beam access software; After the switching is completed, the satellite realizes integrated satellite-ground information interaction through the satellite feeder link or inter-satellite link. After the interaction is completed, it correctly receives the network access request signal of the ground user; during the service process, when the time T1 is less than the safety threshold compared with the time T, the control unit generates a mode switching instruction and loads the measurement and control mode.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1) The control unit configured in the present invention improves the autonomous decision-making capability. It can independently generate commands such as power-off and mode switching of the measurement and control link and the communication link-related single machine according to the information tables such as the real-time position of the satellite, the ground station parameters, and the ground station capabilities. There is no need for the participation of ground operation and maintenance personnel, which greatly improves the autonomy and response speed of the system.

[0011] 2) The present invention improves the measurement and control link efficiency through the coordinated work of the signal processing module baseband processing unit 1, the frequency conversion module unit 1, and the wide-beam transceiver antenna, and can automatically adjust the working mode according to the real-time status of the satellite and the position of the ground station; it can support satellite measurement and control and communication wide-beam access in time-sharing, effectively improving the application efficiency of the system.

[0012] 3) The present invention enables the satellite to automatically adjust the working mode according to the real-time status and the position of the ground station through the coordinated work of the signal processing module baseband processing unit 1, the frequency conversion module unit 1, and the phased array transceiver antenna, and supports flexible switching. It supports rate adaptive data transmission and random measurement and control functions in the staring mode, and supports communication service functions in the agile mode, meeting the diverse needs in different mission scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a connection line diagram of a satellite system that jointly improves the performance of measurement, control, data transmission and communication applications. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0015] Reference Figure 1 A satellite system and method for jointly improving the performance of measurement, control, data transmission and communication applications, including a signal processing module, a frequency conversion module, a phased array transceiver antenna, and a wide-beam transceiver antenna.

[0016] Signal processing module: The signal processing module includes a non-volatile data storage unit, a control unit, and two baseband processing units. The non-volatile data storage unit is divided into two areas, which are used to store software programs and business data respectively. The control unit is responsible for completing the calculation of the satellite's ephemeris and attitude, and parsing the satellite working mode switching instructions based on the ground station information stored in the storage unit, and then sending the instructions to each module unit. Baseband processing unit A mainly completes business signal processing, supports business information transmission and data download from the data storage unit; baseband processing unit B mainly completes measurement and control signal processing, and both baseband processing units support on-orbit reconstruction and loading.

[0017] Frequency conversion module: The frequency conversion module includes two up-conversion units and two down-conversion units. The two up-conversion units respectively perform up-conversion processing on the service link signal and the measurement and control link signal in the signal processing module, and then send the processed signals to the phased array transceiver antenna and the wide beam transceiver antenna respectively; at the same time, the two down-conversion units respectively receive the signals from the phased array transceiver antenna and the wide beam transceiver antenna, complete the down-conversion processing, and then send the processed signals to the signal processing module.

[0018] Phased array transceiver antenna: The phased array transceiver antenna adopts the phased array antenna form, which has high gain and fast pointing adjustment capabilities. It can receive radio signals and send them to the frequency conversion channel for down-conversion processing, and at the same time receive the up-converted signals from the frequency conversion channel and radiate the signals.

[0019] Wide beam transceiver antenna: The wide beam transceiver antenna adopts the wide beam antenna form, which has the characteristics of wide coverage and weak link capability. It also receives the radio signal and sends it to the frequency conversion channel for down-conversion processing, and at the same time receives the up-conversion signal of the frequency conversion channel and radiates the signal.

[0020] This method senses the satellite's own status and ground station location information in real time, automatically adjusts the working mode, and realizes a multi-functional measurement and control link or a multi-functional communication link; the measurement and control link can support command and telemetry transmission, and can also be used as a wide beam access to enhance communication capabilities; the communication link can be used as a data transmission link to transmit monitoring and remote sensing data, and can also be used as an ad hoc measurement and control link to complete all-round and high-frequency delayed telemetry downlink and command uplink in complex mission environments to ensure data interaction. The details are as follows: Multifunctional measurement and control link: The satellite can perceive its own attitude, orbital parameters, equipment operation status and other status information in real time, and obtain and store the location information of all ground stations. Based on these real-time data, the control unit in the satellite signal processing module automatically generates instructions to adjust the working mode of the measurement and control link. On the one hand, the link can support command and telemetry transmission. The ground station can send various control instructions to the satellite through this link, and the satellite can feed back its own telemetry data to the ground station through this link to achieve real-time monitoring and precise control of the satellite. On the other hand, under certain circumstances, the measurement and control link can also be used as a wide-beam access to provide a wider range of communication coverage for other space equipment or ground mobile terminals, and enhance the communication access capability of the satellite system.

[0021] Multifunctional communication link: The communication link can be used as a data transmission link to complete information transmission. On the basis of supporting two-way communication with ground users, it can also stably and efficiently transmit the monitoring data or remote sensing data obtained by the satellite to the ground station or other designated data receiving end. At the same time, the communication link can also be used as an ad hoc measurement and control link. When the satellite is in a complex mission environment or needs to respond quickly to the control of the ground station, this mode can complete high-frequency telemetry downlink and command injection, ensuring high-frequency and reliable data interaction between the satellite and the ground station, and timely adjusting the working status of the satellite to meet the mission requirements.

[0022] This embodiment also discloses a method for jointly improving the performance of measurement, control, data transmission and communication applications based on the above system, and the working principle is as follows: Step 101, the control unit in the satellite signal processing module automatically generates a mode instruction by reading the ground station position parameters stored in the data storage module (see Table 1), combined with the satellite real-time position and attitude broadcast by the satellite platform. On this basis, the signal processing module, frequency conversion channel, wide beam transceiver antenna, phased array transceiver antenna, etc. are powered on and off and the software version is loaded.

[0023] Table 1: Ground control station information storage table

[0024] Step 102: If the satellite signal processing module control unit determines that a link can be established with the tracking and control station, the baseband signal unit A, frequency conversion channel A, and wide beam transceiver antenna are powered on; the signal processing module loads the tracking and control program and performs tracking and control link establishment. When the satellite is about to leave the tracking and control station, it determines the next visible signal gateway time T; if the time T is greater than the specified value Ts (supports modification), the control unit generates a mode switching instruction and starts timing T1.

[0025] Step 103: The satellite signal processing module baseband signal unit A loads the wide beam access software.

[0026] Step 104, after the switching is completed, the satellite realizes the integrated satellite-ground information interaction through the satellite feeder link, inter-satellite link, etc. After the interaction is completed, it can correctly receive the network access request signal of the ground user; during the service process, when the time T1 is less than the safety threshold compared with the time T, the control unit generates a mode switching instruction and loads the measurement and control mode.

[0027] As the satellite moves, the above steps 101 to 105 are repeated continuously.

[0028] The communication link adjustment process is as follows: The control unit in the satellite signal processing module automatically generates mode instructions by reading the data transmission station location parameters (see Table 2), communication service area, etc. stored in the data storage module, and combining the satellite real-time position and attitude broadcast by the satellite platform. On this basis, the signal processing module, frequency conversion channel, wide beam transceiver antenna, phased array antenna, etc. are powered on and off and the software version is loaded; if the satellite enters the communication service area, and the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are in the off state, steps 201 to 204 are performed; if the satellite signal processing module control unit determines that a link can be established with the data transmission station, and the baseband signal unit B, frequency conversion channel unit B, and phased array transceiver antenna are in the off state, steps 205 to 208 are performed; Table 2: Ground data transmission station information storage table

[0029] Step 201, the control unit generates an instruction to control the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna to power on; the baseband processing unit B in the signal processing module is powered on to load the service software version program, and the phased array transceiver antenna works in a beam hopping mode; Step 202, the baseband processing unit B supports reading broadcast information in the data storage module for transmission while performing service communication; during operation, the control unit monitors service beam traffic; Step 203: If the average value of the beam traffic of the satellite in the service area is less than the threshold value (the size can be modified in orbit) within a certain period of time (the time can be modified in orbit) or it is about to leave the planned service area, the control unit controls the baseband processing unit B to initiate traffic switching, and the traffic of this satellite is landed through the neighboring satellite.

[0030] Step 204, after the traffic switching is completed, the baseband signal unit B, the frequency conversion channel unit B, and the phased array transceiver antenna are turned off; Step 205, the control unit generates an instruction to control the baseband signal unit B, the frequency conversion channel unit B, and the phased array transceiver antenna to power on; the phased array antenna works in the staring mode, the baseband processing unit B loads the data transmission software version, and opens the data storage unit; Step 206, after the control is completed, the stored data is downloaded; Step 207: During the transmission process, the receiving status of the ground data transmission gateway can be reported via the communication uplink, and the satellite can make adaptive rate adjustments accordingly.

[0031] Step 208, after the data storage unit completes the data storage, the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna enter the shutdown state.

Claims

1. A satellite system for improving the performance of measurement, control, data transmission and communication applications, characterized in that: It includes a signal processing module, a frequency conversion module, a phased array transceiver antenna and a wide beam transceiver antenna; Signal processing module: The signal processing module includes a data storage unit, a control unit and two baseband processing units; the control unit is responsible for completing the ephemeris and attitude calculation of the satellite broadcast, and parsing the satellite working mode switching instruction based on the ground station information stored in the data storage unit, and then sending the instruction to the frequency conversion module, phased array transceiver antenna, and wide beam transceiver antenna; Both baseband processing units support on-orbit reconstruction and loading, where baseband processing unit A is used to complete measurement and control signal processing or user wide-beam access signal processing; The baseband processing unit B is used to complete communication service signal processing or data transmission signal processing; Frequency conversion module: The frequency conversion module includes two frequency conversion channels; both frequency conversion channels include an up-conversion unit and a down-conversion unit; the two up-conversion units respectively perform up-conversion processing on the service link signal and the measurement and control link signal in the signal processing module, and then send the processed signals to the phased array transceiver antenna and the wide-beam transceiver antenna respectively; the two down-conversion units respectively receive the signals from the phased array transceiver antenna and the wide-beam transceiver antenna, complete the down-conversion processing, and then send the processed signals to the signal processing module.

2. A satellite system for improving the performance of measurement, control, data transmission and communication applications according to claim 1, characterized in that: The phased array transceiver antenna can receive radio signals and send them to the frequency conversion channel for down-conversion processing, while receiving the up-converted signals from the frequency conversion channel and radiating the signals.

3. A satellite system for improving the performance of measurement, control, data transmission and communication applications according to claim 1, characterized in that: The wide beam transceiver antenna can receive radio signals and send them to the frequency conversion channel for down-conversion processing, while receiving the up-converted signals from the frequency conversion channel and radiating the signals.

4. A satellite system for improving the performance of measurement, control, data transmission and communication applications according to claim 1, characterized in that: Phased array communication link communication process: The satellite senses its own attitude, orbital parameters, and equipment operating status in real time, and obtains and stores the location information of all ground stations. Based on the real-time sensing information and location information, the control unit in the satellite signal processing module generates instructions to adjust the working mode of the communication link. The adjustment process is as follows: If the satellite enters the communication service area, and the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna are in a powered-off state, the control unit generates a command to power on the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna; The baseband processing unit B in the signal processing module is turned on to load the service software version program, and the phased array transceiver antenna works in the beam hopping mode; during operation, the control unit monitors the service beam traffic; if the average value of the beam traffic of the satellite in the service area is less than the threshold within a certain period of time or is about to leave the planned service area, the control unit controls the baseband processing unit B to initiate traffic switching, and the traffic of the local satellite is landed through the adjacent satellite; after the traffic switching is completed, the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna are shut down; If the satellite signal processing module control unit determines that a link can be established with the data transmission station, and the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna are in a shutdown state; the control unit generates an instruction to control the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna to power on; the phased array antenna works in the staring mode, the baseband processing unit B loads the data transmission software version, and opens the data storage unit; After the control is completed, the stored data is downloaded; During the transmission process, the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna receive the reception status reported by the ground data transmission gateway, and the satellite makes adaptive rate adjustments accordingly; After the data storage unit completes the data, the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna enter the shutdown state.

5. A satellite system for improving the performance of measurement, control, data transmission and communication applications according to claim 1, characterized in that: Wide beam tracking and control link communication process: The control unit in the satellite signal processing module generates a mode instruction by reading the ground station position parameters stored in the data storage module and combining the real-time satellite position and attitude broadcast by the satellite platform; on this basis, the signal processing module, frequency conversion channel, wide beam transceiver antenna, phased array antenna, etc. are powered on and off and the software version is loaded; If the satellite signal processing module control unit determines that a link can be established with the measurement and control station, the baseband signal unit A, the frequency conversion channel A, and the wide beam transceiver antenna are powered on; the signal processing module loads the measurement and control program and performs measurement and control link establishment; When the satellite is about to leave the tracking and control station, it determines the next visible signal gateway time T; if the time T is greater than the specified value Ts, the control unit generates a mode switching instruction and starts timing T1; The baseband signal processing unit of the satellite signal processing module loads the user wide beam access software; After the handover is completed, the satellite realizes satellite-ground integrated information interaction through satellite feeder links or inter-satellite links. After the interaction is completed, it correctly receives the network access request signal from the ground user; During the service process, when time T1 is less than the safety threshold compared with time T, the control unit generates a mode switching instruction and loads the measurement and control mode.

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