A satellite system for jointly improving the application efficiency of measurement and control, data transmission and communication

Abstract

The present invention belongs to the technical field of low-orbit satellite communication, and discloses a satellite system for jointly improving the application efficiency of TT&C (Telemetry, Tracking and Command) and data transmission and communication. Its control unit is responsible for calculating the ephemeris and satellite attitude for satellite broadcasting, parsing the satellite working mode switching instruction according to the ground station information stored in the storage unit, and then sending the instruction to each module unit; both baseband processing units support on-orbit reconfiguration and loading, wherein baseband processing unit A is used to complete TT&C signal processing or user wide-beam access signal processing; baseband processing unit B is used to complete communication service signal processing or data transmission signal processing; two up-conversion units respectively perform up-conversion processing on the service link signal and the TT&C link signal in the signal processing module, and two down-conversion units respectively receive the signals from the phased array transceiver antenna and the wide-beam transceiver antenna, and complete down-conversion processing. The TT&C link can support the satellite TT&C function and the communication wide-beam access function in a time-sharing manner.

Description

Technical Field

[0001] The present invention relates to the technical field of low-earth orbit satellite communication, and in particular to a satellite system for jointly improving the application efficiency of TT&C, data transmission and communication. Background Art

[0002] With the rapid development of low-earth orbit satellite Internet, satellites are increasingly widely used in the fields of communication, remote sensing, monitoring, etc. However, there are many problems to be solved in the current satellite system: First, the TT&C link and the communication link are independent of each other and have single functions, resulting in low resource utilization. The TT&C link is mainly used for command uploading and telemetry downloading, and the communication link only undertakes the data transmission task and cannot flexibly switch functions according to actual needs. Second, in order to implement multiple functions such as satellite TT&C, broadband communication, and data transmission, different and independent payloads usually need to be configured, which not only increases the weight and cost of the satellite, but also makes it difficult to realize the lightweight of the satellite. Third, in the face of complex and changeable space environments and diverse mission requirements, the traditional satellite link mode cannot adjust the working mode in real time and is difficult to efficiently complete multiple data transmission tasks. For example, when the satellite orbit changes or the ground station position moves, the link function cannot be optimized in time to ensure the stability of communication and the efficiency of data transmission. In addition, the limited satellite payload resources and the huge pressure on the ground operation and maintenance center also pose higher requirements for 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 application efficiency of TT&C, data transmission and communication. Summary of the Invention

[0003] The present invention aims to provide a satellite system for jointly improving the application efficiency of TT&C, data transmission and communication, enabling the satellite to adjust the working mode in real time according to the real-time state and the ground station position, optimizing the functional integration ability of the TT&C link and the communication link, improving the system resource utilization rate and mission adaptability, and thereby enhancing the overall application efficiency of the satellite system. The TT&C link can support the satellite TT&C function and the communication wide-beam access function in a time-sharing manner; the communication link staring mode can support one or more of the functions of data transmission and accompanying TT&C, and communication and broadcast distribution in the agile mode.

[0004] The present invention realizes the above effects through the following technical solutions:

[0005] A satellite system for jointly improving the application efficiency of TT&C, data transmission and communication, characterized in that it includes a signal processing module, a frequency conversion module, a phased array transceiver antenna, and a wide-beam transceiver antenna.

[0006] 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 calculating the ephemeris and attitude of satellite broadcasts, 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, where baseband processing unit A is used to complete TT&C signal processing or user wide beam access signal processing; baseband processing unit B is used to complete communication service signal processing or data transmission signal processing;

[0007] 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 TT&C link signal in the signal processing module, and then send the processed signals to the phased array transceiver antenna and wide beam transceiver antenna respectively; the two down-conversion units respectively receive the signals from the phased array transceiver antenna and wide beam transceiver antenna, complete the down-conversion processing, and then send the processed signals to the signal processing module.

[0008] 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 perform signal radiation.

[0009] The wide beam transceiver antenna receives radio signals and sends them to the frequency conversion channel for down-conversion processing, and at the same time receives the up-converted signals from the frequency conversion channel and performs signal radiation.

[0010] The satellite real-time senses its own attitude, orbital parameters, and equipment operating status information, and at the same time acquires 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 an instruction to adjust the working mode of the communication link, and the adjustment process is as follows:

[0011] When 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 shutdown state, the control unit generates an instruction to power on the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna; the baseband processing unit B in the signal processing module boots up and loads the service software version program, and the phased array transceiver antenna operates in the hopping beam mode; while performing business communication, the baseband processing unit B reads the broadcast information in the data storage module and sends it; during operation, the control unit monitors the traffic of the service beam; 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 immediately, 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; after the traffic switching is completed, the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are shut down individually;

[0012] If the control unit of the satellite signal processing module 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 unit are in the shutdown state; the control unit generates an instruction to power on the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna unit; the phased array antenna operates in the staring mode, the baseband processing unit B loads the data transmission software version, and the data storage unit is turned on; 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 receiving status reported by the ground data transmission gateway station, and the satellite performs rate adaptive adjustment accordingly; after the data in the data storage unit is completed, the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna enter the shutdown state.

[0013] Communication process of the wide beam TT&C link:

[0014] 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 position and attitude of the satellite broadcast by the satellite platform; and on this basis, the signal processing module, frequency conversion channel, wide beam transceiver antenna, phased array antenna, etc. perform power on / off and software version loading.

[0015] When the control unit of the satellite signal processing module determines that a link can be established with the TT&C station, it powers on through the baseband signal unit A, frequency conversion channel A, and wide beam transceiver antenna; the signal processing module loads the TT&C program to establish a TT&C link; when the satellite is about to leave the TT&C station, it judges the next visible gateway station 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.

[0016] The baseband signal processing unit of the satellite signal processing module loads the wide beam access software.

[0017] After the switching is completed, the satellite realizes space-ground integrated information interaction through the satellite power supply link or inter-satellite link. After the interaction is completed, it correctly receives the 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 TT&C mode.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1) The control unit configured in the present invention improves the autonomous decision-making ability, and can independently generate instructions such as power on / off and mode switching of the relevant single machines of the TT&C link and communication link according to information tables such as the real-time position of the satellite, ground station parameters, and ground station capabilities, without the participation of ground operation and maintenance personnel, greatly improving the autonomy and response speed of the system.

[0020] 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.

[0021] 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

[0022] 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Phased array transceiver antenna: The phased array transceiver antenna adopts the form of a phased array antenna and has high gain and the ability to quickly adjust the pointing. 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 perform signal radiation.

[0028] Wide beam transceiver antenna: The wide beam transceiver antenna adopts the form of a wide beam antenna and has the characteristics of a wide coverage range and weak link capabilities. It also receives radio signals and sends them to the frequency conversion channel for down-conversion processing, and at the same time receives the up-converted signals from the frequency conversion channel and performs signal radiation.

[0029] This method can sense the satellite's own state and the position information of the ground station in real time, automatically adjust the working mode, and realize a multi-functional measurement and control link or a multi-functional communication link; among them, the measurement and control link can support command and telemetry transmission, and can also be used as a wide beam access to enhance the communication ability; 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 a complex mission environment to ensure data interaction. Specifically as follows:

[0030] Multi-functional measurement and control link: The satellite can sense its own attitude, orbit parameters, equipment operation status and other status information in real time, and at the same time obtain and store the position information of all ground stations. Based on these real-time data, the control unit in the satellite signal processing module automatically generates commands to adjust the working mode of the measurement and control link. On the one hand, this link can support command and telemetry transmission. The ground station can send various control commands to the satellite through this link, and the satellite will feedback its own telemetry data to the ground station through this link to realize real-time monitoring and precise control of the satellite. On the other hand, in specific situations, the measurement and control link can also be used as a wide beam access to provide a wider communication coverage for other space devices or ground mobile terminals and enhance the communication access ability of the satellite system.

[0031] Multi-functional 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 of 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 specified data receiving ends. At the same time, this 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 quickly respond to the control of the ground station, this mode can complete high-frequency telemetry downlink and command uplink to ensure high-frequency and reliable data interaction between the satellite and the ground station, and timely adjust the working state of the satellite to meet the mission requirements.

[0032] This embodiment also discloses a method for jointly improving the application efficiency of measurement and control data transmission and communication relying on the above system. The working principle is as follows:

[0033] Step 101: The control unit in the satellite signal processing module automatically generates mode instructions by reading the ground station position parameters stored in the data storage module (see Table 1) and combining the real-time position and attitude of the satellite broadcast by the satellite platform. On this basis, power-on and power-off operations and software version loading are performed on the signal processing module, frequency conversion channels, wide-beam transceiver antennas, phased array transceiver antennas, etc.

[0034] Table 1: Information Storage Table of Ground Measurement and Control Stations

[0035]

[0036] Step 102: If the control unit in the satellite signal processing module determines that a link can be established with the measurement 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 measurement and control program to establish a measurement and control link. When the satellite is about to leave the measurement and control station, it determines the next visible signal gateway station time T; if the time T is greater than the specified value Ts (supporting modification), the control unit generates a mode switching instruction and starts timing T1.

[0037] Step 103: The baseband signal unit A in the satellite signal processing module loads the wide-beam access software.

[0038] After the switching is completed, the satellite realizes space-ground integrated information interaction through the satellite power feeding 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.

[0039] As the satellite operates, the above steps 101 to 105 are continuously repeated.

[0040] The communication link adjustment process is as follows:

[0041] The control unit in the satellite signal processing module automatically generates mode instructions by reading the data transmission station position parameters (see Table 2), communication service area, etc. stored in the data storage module and combining the real-time position and attitude of the satellite broadcast by the satellite platform. On this basis, power-on and power-off operations and software version loading are performed on the signal processing module, frequency conversion channels, wide-beam transceiver antennas, phased array antennas, etc.; if the satellite enters the communication service area and the baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna single machines are in the shutdown state, steps 201 to 204 are performed; if the control unit in the satellite signal processing module 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 single machines are in the shutdown state, steps 205 to 208 are performed;

[0042] Table 2: Information Storage Table of Ground Data Transmission Stations

[0043]

[0044] 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 unit to power on; in the signal processing module, the baseband processing unit B boots up and loads the service software version program, and the phased array transceiver antenna operates in the beam hopping mode.

[0045] Step 202: While conducting service communication, the baseband processing unit B also supports reading the broadcast information in the data storage module for transmission; during operation, the control unit monitors the service beam traffic.

[0046] Step 203: If the average value of the beam traffic of the satellites within the service area is less than the threshold (the size can be modified on orbit) within a certain time (the time can be modified on orbit) or it can 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.

[0047] 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 unit enter the shutdown mode.

[0048] 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 unit to power on; the phased array antenna operates in the staring mode, the baseband processing unit B loads the data transmission software version, and the data storage unit is opened.

[0049] Step 206: After the control is completed, the stored data is downloaded.

[0050] Step 207: During the transmission process, the receiving status of the ground data transmission gateway station can be reported through the communication uplink, and the satellite generates a rate adaptive adjustment accordingly.

[0051] Step 208: After the data in the data storage unit is completed, 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 jointly improving the application efficiency of measurement and control, data transmission and communication, 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 calculating the ephemeris and satellite attitude of satellite broadcasting, 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, the phased array transceiver antenna, and the wide-beam transceiver antenna; Both of the two baseband processing units support on-orbit reconfiguration and loading. Among them, baseband processing unit A is used to complete the processing of TT&C signals or the processing of user wide-beam access signals; Baseband processing unit B is used to complete the processing of communication service signals or the processing of data transmission signals; Frequency conversion module: The frequency conversion module includes two frequency conversion channels; Both of the two 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 TT&C 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 of 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; Communication process of the phased array communication link: The satellite real-time senses its own attitude, orbit parameters, and equipment operating status information, and at the same time acquires and stores the position information of all ground stations; Based on the real-time sensing information and position information, the control unit in the satellite signal processing module generates an instruction to adjust the working mode of the communication link. The adjustment process is as follows: When the satellite enters the communication service area and baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are in the off state, the control unit generates an instruction to power on baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna; Baseband processing unit B in the signal processing module boots up and loads the service software version program, and the phased array transceiver antenna operates in the hopping beam mode; During operation, the control unit monitors the traffic of the service beam; 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 immediately, the control unit controls baseband processing unit B to initiate traffic switching, and the traffic of this satellite is relayed through neighboring satellites for landing; After the traffic switching is completed, baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are powered off individually; If the control unit of the satellite signal processing module determines that a link can be established with the data transmission station and baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna are in the off state individually; The control unit generates an instruction to control baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna to be powered on individually; The phased array antenna operates in the staring mode, 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 ground data transmission gateway station reports the reception status through baseband signal unit B, frequency conversion channel B, and phased array transceiver antenna, and the satellite adjusts the rate adaptively accordingly; After the data storage unit finishes storing data, the baseband signal unit B, the frequency conversion channel B, and the phased array transceiver antenna enter the shutdown state; Wide-beam TT&C link communication process: In the satellite signal processing module, the control unit generates mode instructions by reading the ground station position parameters stored in the data storage module and combining with the real-time position and attitude of the satellite broadcast by the satellite platform; on this basis, power-on and power-off operations and software version loading are performed on the signal processing module, the frequency conversion channel, the wide-beam transceiver antenna, the phased array antenna, etc. If the control unit of the satellite signal processing module determines that a link can be established with the TT&C 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 TT&C program to establish a TT&C link. When the satellite is about to leave the TT&C station, it judges the next visible time T of the gateway station; 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 switching is completed, the satellite realizes space-ground integrated information interaction through the satellite power feed link or the 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 TT&C mode.

2. The satellite system for jointly improving the application efficiency of measurement and control data transmission and communication according to claim 1, wherein 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 perform signal radiation.

3. The satellite system for jointly improving the application efficiency of measurement and control data transmission and communication according to claim 1, wherein, The wide-beam 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 perform signal radiation.

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