System for improving application efficiency of measurement and control data transmission function of low earth orbit satellite

Abstract

The invention discloses a low-orbit satellite measurement and control data transmission function application efficiency improving system, and belongs to the technical field of low-orbit satellite communication. A data storage unit equipped with a file management system is integrated, and the storage unit is divided into areas with different priorities. And the data transmission signal processing unit can read the data according to the priority sequence or a certain pre-planned fixed priority. Besides, the load monitoring unit can carry out power-up and default parameter configuration on a satellite load single machine or module according to preset ground station capability and position parameters in combination with the real-time position of the satellite, so that accurate adjustment of the satellite state is realized, and energy consumption is reduced. The method has the remarkable advantages that autonomous operation of the satellite load is supported, and meanwhile self-adaptive adjustment of the data transmission rate and high-frequency rapid return of all working parameters of the load are considered.

Description

Technical Field

[0001] The present invention relates to the technical field of low-orbit satellite communications, and in particular to a system for improving the application efficiency of low-orbit satellite measurement, control and data transmission. Background Art

[0002] In recent years, large-scale low-orbit satellites have provided new means and massive data for earth science research with their wide-range observation capabilities of the earth. Through the efficient satellite-to-ground link transmission of these data, many fields such as scientific research, meteorology, and communications can use them in a timely manner, which has effectively promoted the development and progress of various industries. However, the development of satellites has also brought new challenges. Due to the wide variety of satellite payloads, complex functions and high flexibility, there are many parameters of satellite working status. In order to further improve the monitoring capability of satellite operating status, it is particularly important to fully and frequently transmit satellite telemetry status. However, there are some problems that need to be solved in the existing measurement and control data transmission system. On the one hand, the adaptive capability of the satellite-to-ground data transmission link is insufficient, and it is difficult to adapt to the changes in the space environment and the characteristics of high-speed movement of low-orbit satellites in real time, which directly leads to low reliability and efficiency of data transmission. On the other hand, state telemetry relies on conventional measurement and control links for transmission, with limited speed, and can only transmit key information, which cannot allow relevant personnel to understand the satellite status in a timely and comprehensive manner. Therefore, given the limited weight, energy and other resources of low-orbit satellites, how to fully utilize the capabilities of the measurement and control uplink and downlink as well as the satellite-to-ground downlink, improve the transmission efficiency of satellite-to-ground data transmission, and realize the large-scale implementation of telemetry data is of extremely important practical significance. Summary of the invention

[0003] The present invention aims to solve the problems of insufficient self-adaptation capability of data transmission links and low efficiency of telemetry data return in the prior art, and to provide a low-orbit satellite measurement and control data transmission application efficiency improvement system, thereby improving the reliability and efficiency of data transmission, enhancing the ability to monitor satellite status, and improving the ground operation and maintenance efficiency of large-scale low-orbit satellites.

[0004] The present invention achieves the above effects through the following technical solutions: A system for improving the application efficiency of low-orbit satellite measurement, control and data transmission functions, including a signal processing module, a measurement and control transceiver antenna, a data transmission transmitting antenna, a data storage module and a payload monitoring module; The signal processing module includes a measurement and control link signal processing unit and a data transmission link signal processing unit. The measurement and control link signal processing unit is responsible for measurement and control link signal processing, receives control instructions through the measurement and control uplink, and is responsible for collecting the status parameters of all single loads, managing the collected status at different frequencies, and storing it in the data storage module or sending it down through the measurement and control downlink; the data transmission link signal processing unit is used to complete the processing of the digital transmission signal, adjust the rate according to the feedback parameters of the ground station received by the measurement and control uplink, and transmit the information of the data storage unit to the ground; The measurement and control transceiver antenna is responsible for receiving the measurement and control uplink radio signal and transmitting it to the measurement and control link signal processing unit in the signal processing module; at the same time, the antenna also transmits the signal output by the measurement and control link signal processing unit in the signal processing module; The function of the data transmission antenna is to transmit the signal output by the data transmission link signal processing unit in the signal processing module by radio, so as to realize the rapid return of large-capacity data of the load working status parameters and business information; The data storage module divides storage areas into different priorities, and with the help of the file management system, it can perform file reading operations according to actual needs. It is used to store comprehensive and high-frequency status parameters collected by the measurement and control link signal processing unit in the signal processing module and to store remote sensing, reconnaissance and other data business information generated by other business loads.

[0005] The payload monitoring module autonomously generates work instructions based on the mission planning and the real-time working status of the satellite, and distributes them to the data storage module, signal processing module, measurement and control transceiver antenna, data transmission antenna and other modules for execution; at the same time, it can receive control instructions sent uplink through the measurement and control link.

[0006] Furthermore, The payload monitoring module establishes link connections with the measurement and control terminal and the data transmission terminal of the ground integrated information station, and performs calculations based on the mission planning, the real-time position of the satellite, and the pre-stored position and capability parameters of the ground station; and performs the corresponding data transmission rate adjustment process according to the communication capability of the ground station; If the ground station has both the measurement and control link capability and the data transmission link capability, proceed as follows: Step 201, power on the measurement and control link signal processing unit, the data transmission link signal processing unit, the load monitoring module, the measurement and control transceiver antenna, the data transmission storage module and the data transmission transmitting antenna, and configure the working parameters; Step 202, the satellite simultaneously establishes links with the measurement and control terminal and the data transmission terminal of the ground station; Step 203, the satellite's tracking and control link signal processing unit transmits the collected telemetry information to the data transmission link signal processing unit, and the data transmission link signal processing unit then transmits the telemetry information and the information in the data transmission storage module; Step 204, in the data transmission working state, read and send data according to the priority order of the files in the data storage unit; or configure the priority of the downloaded files through the measurement and control uplink, and after the setting is completed, use the digital transmission satellite-to-ground link to download the files with the corresponding priority; Step 205, the data link signal processing unit in the signal processing module communicates at the lowest information rate in the initial state; after the data transmission receiving device in the ground integrated information station correctly receives the signal, it estimates the receiving signal-to-noise ratio and reports the status information through the measurement and control uplink; Step 206, the digital signal processing module makes a judgment according to the preset modulation and coding module input table; Step 207: The data transmission link signal processing unit performs adjustment and starts data transmission.

[0007] Furthermore, If the ground station only has the capability of tracking and controlling the link, proceed as follows: Step 101, power on the measurement and control link signal processing unit, the load monitoring module, the measurement and control transceiver antenna, and the data transmission storage module, and complete the working parameter configuration; Step 102, the satellite establishes a connection with the measurement and control terminal of the ground station; Step 103, the measurement and control link signal processing unit collects and distributes the working status parameters of the modules such as the data storage module, the signal processing module, the measurement and control transceiver antenna, and the data transmission antenna, and then extracts the collected parameters and transmits the extracted information through the measurement and control downlink; at the same time, all the collected status parameters are transmitted to the data storage unit for storage.

[0008] Furthermore, If the ground station only has data link capability, proceed as follows: Step 301, power on the data transmission link signal processing unit, the load monitoring module, the data transmission storage module, and the data transmission transmitting antenna and configure the working parameters; Step 302: The satellite establishes a link with the ground data transmission terminal and sends the stored data at a fixed rate and according to the priority.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1) The present invention can transmit the data transmission link downlink performance information to the data transmission link signal processing unit by means of the measurement and control link uplink; the unit adaptively adjusts the data transmission rate to better adapt to the motion characteristics of low-orbit satellites and changes in the space environment, and effectively improve the reliability and efficiency of data transmission.

[0010] 2) The present invention is provided with a payload monitoring module, which can autonomously power on and configure default parameters of satellite payload units or modules according to mission planning, ground station location and capability parameters, satellite real-time status, etc., to achieve precise adjustment of satellite status and reduce energy consumption.

[0011] 3) The present invention sets up a data storage module, which supports operation based on the file management system, partitions the module to store delay telemetry data, different business data, etc.; each file system covers information such as file name, generation time and file priority. At the same time, the data storage module supports partitioning, and each area can set priority independently. The data link signal processing unit can poll in priority order or specify priority data for return. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a connection line diagram of a low-orbit satellite measurement, control and data transmission application efficiency improvement system. DETAILED DESCRIPTION

[0013] 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.

[0014] This embodiment is based on the mission planning and the real-time status of the satellite. When only key monitoring is required, control can be implemented through a conventional wide-beam measurement and control link. When there is a large amount of data return demand in the satellite mission planning, the data transmission equipment will start data transmission. When the data transmission is working, the data is returned in the priority order of the storage files, and it also supports the return of fixed priority files. What is particularly important is that during the data transmission process, this method can use the measurement and control uplink to complete the adjustment of the data transmission link rate, so that it can better adapt to the motion characteristics of low-orbit satellites, thereby improving the data transmission efficiency between the satellite and the ground.

[0015] A low-orbit satellite measurement and control data transmission application efficiency improvement system includes a signal processing module, a measurement and control transceiver antenna, a data transmission transmitting antenna, a data storage module, and a payload monitoring module.

[0016] The signal processing module includes the measurement and control link signal processing unit and the data transmission link signal processing unit; the measurement and control link signal processing unit is responsible for measurement and control link signal processing, and receives control instructions through the measurement and control uplink. This module is responsible for collecting the status parameters of all single payloads, and managing the collected status at different frequencies, storing it in the data storage module or sending it down through the measurement and control downlink. The data transmission link signal processing unit completes the processing of the digital transmission signal, adjusts the rate according to the feedback parameters of the ground station received by the measurement and control uplink, and transmits the information of the data storage unit to the ground.

[0017] The TT&C transceiver antenna has a wide beam coverage characteristic and a wide coverage range, but the link capability is relatively weak. It is mainly responsible for receiving the TT&C uplink radio signal and transmitting it to the TT&C link signal processing unit in the signal processing module. At the same time, the antenna also transmits the signal output by the TT&C link signal processing unit in the signal processing module.

[0018] The data transmission antenna is characterized by high gain and strong directivity, and has strong link capability. The function of this module is to transmit the signal output by the data transmission link signal processing unit in the signal processing module through radio transmission, thereby realizing the rapid return of large-capacity data such as load working status parameters and business information.

[0019] The data storage module divides storage areas into different priorities, and uses the file management system to perform file reading operations based on actual needs. It is mainly used to store comprehensive and high-frequency status parameters collected by the measurement and control link signal processing unit in the signal processing module, and can also store other data business information.

[0020] The payload monitoring module autonomously generates work instructions based on the mission planning and the real-time working status of the satellite, and distributes them to other functional modules for execution; at the same time, the module can also receive control instructions sent uplink through the measurement and control link.

[0021] The system has a strong adaptive capability and can use the measurement and control uplink and the data transmission downlink to automatically adjust the satellite-to-ground data transmission capability, including key parameters such as coding and modulation, so as to effectively adapt to the fast-moving characteristics of low-orbit satellites and the complex and changing space environment. In addition, the system can also use the satellite-to-ground data transmission downlink to achieve the transmission of delayed telemetry data or high-frequency, high-information real-time telemetry data, fully meeting the needs of long-term autonomous operation of satellites.

[0022] Reference Figure 1 A low-orbit satellite measurement and control data transmission application efficiency improvement system includes a signal processing module, a measurement and control transceiver antenna, a data transmission transmitting antenna, a data storage module, and a payload monitoring module.

[0023] The signal processing module completes the measurement and control signal processing, data transmission signal processing and task decomposition and dispatch execution; the measurement and control antenna completes the measurement and control link signal reception and transmission; the data transmission transmitting antenna completes the data transmission link signal transmission; the data storage module completes the delayed telemetry storage or other data service information storage. The payload monitoring module generates work instructions according to the mission planning and the real-time working status of the satellite and distributes them to the remaining functional modules for execution. This system can use the measurement and control uplink and the data transmission downlink to complete the self-adjustment of the satellite-to-ground data transmission capabilities, including parameters such as coding method and modulation method, to adapt to the rapid movement characteristics of low-orbit satellites and changes in the space environment; at the same time, the satellite-to-ground data transmission downlink is used to complete delayed telemetry or high-frequency and high-information real-time telemetry transmission to meet the long-term autonomous operation requirements of the satellite.

[0024] The working principle of the data transmission rate adaptive adjustment method in this embodiment is as follows: a) The satellite payload monitoring module performs calculations based on the mission plan, the real-time position of the satellite, and the pre-stored ground station position and capability parameters (see Table 1). On this basis, the signal processing module, antenna module, etc. are powered on and the default working parameters are configured. At the same time, the satellite payload monitoring module establishes link connections with the measurement and control terminal and data transmission terminal of the ground integrated information station.

[0025] Table 1: Ground station parameters and working capabilities

[0026]

[0027] b) The data storage module is divided into different areas, each area is given a separate priority, and the area priority can be adjusted while in orbit. The module supports operations based on the file management system, which covers information such as file name, generation time, and file priority.

[0028] c) Execute corresponding processes according to different communication capabilities of ground stations; If the ground station only has the capability of tracking and controlling the link, perform the following process: Power on the measurement and control link signal processing unit, payload monitoring module, measurement and control transceiver antenna, and data transmission storage module, and complete the working parameter configuration, then the satellite establishes a connection with the measurement and control terminal of the ground station. The measurement and control link signal processing unit is responsible for collecting the working status parameters of each functional payload and module, extracting these parameters, transmitting key information through the measurement and control downlink, and transmitting all collected status parameters to the data storage unit.

[0029] If the ground station has both the measurement and control link capability and the data transmission link capability, the following process is performed: The measurement and control link signal processing unit, the data transmission link signal processing unit, the payload monitoring module, the measurement and control transceiver antenna, the data transmission storage module and the data transmission transmitting antenna are powered on, and the working parameters are configured. After that, the satellite simultaneously establishes links with the measurement and control terminal and the data transmission terminal of the ground station. The satellite's measurement and control link signal processing unit transmits all the collected telemetry information to the data transmission link signal processing unit, and the data transmission link signal processing unit then transmits the telemetry information and the information in the data transmission storage module. In the digital transmission working state, the data is read and sent down in the order of the priority of the files in the data storage unit. In addition, the priority of the downloaded files can also be configured through the measurement and control uplink. After the setting is completed, only the files of the corresponding priority are downloaded with the help of the digital transmission satellite-to-ground link.

[0030] The data link signal processing unit in the signal processing module uses the lowest information rate for communication in the initial state. After the data transmission receiving device in the ground integrated information station correctly receives the signal, it estimates the received signal-to-noise ratio and reports the status information through the measurement and control uplink.

[0031] The digital signal processing module makes a judgment based on the preset modulation and coding module input table (see Table 2). The following is an example of the input table: if the parsed downlink reception signal-to-noise ratio is higher than the next-order admission signal-to-noise ratio, the modulation mode of the digital downlink link is increased by one order; if the parsed downlink reception signal-to-noise ratio is lower than the next-order admission signal-to-noise ratio, the modulation mode of the digital downlink link is reduced by one order; if in other cases, the modulation mode remains unchanged.

[0032] Table 2: Modulation and coding module input table

[0033] The data transmission link signal processing unit performs adjustments and starts data transmission.

[0034] If the ground station does not have any communication capabilities, perform the following process: The measurement and control link signal processing unit, load monitoring module, and data transmission storage module are powered on and the working parameters are configured. The telemetry parameters and business data are stored in the specified file area.

[0035] If the ground station only has data transmission link capability, perform the following process.

[0036] The data transmission link signal processing unit, load monitoring module, data transmission storage module, and data transmission transmitting antenna are powered on and the working parameters are configured, and a link is established with the ground data transmission terminal to complete the storage data transmission at a fixed rate and according to priority.

Claims

1. A system for improving the application efficiency of low-orbit satellite measurement, control and data transmission functions, characterized in that: It includes signal processing module, measurement and control transceiver antenna, data transmission antenna, data storage module and load monitoring module; The signal processing module includes a measurement and control link signal processing unit and a data transmission link signal processing unit. The measurement and control link signal processing unit is responsible for measurement and control link signal processing, receives control instructions through the measurement and control uplink, and is responsible for collecting the status parameters of all single loads, managing the collected status at different frequencies, and storing it in the data storage module or sending it down through the measurement and control downlink; the data transmission link signal processing unit is used to complete the processing of the digital transmission signal, adjust the rate according to the feedback parameters of the ground station received by the measurement and control uplink, and transmit the information of the data storage unit to the ground; The measurement and control transceiver antenna is responsible for receiving the measurement and control uplink radio signal and transmitting it to the measurement and control link signal processing unit in the signal processing module; at the same time, the antenna also transmits the signal output by the measurement and control link signal processing unit in the signal processing module; The function of the data transmission antenna is to transmit the signal output by the data transmission link signal processing unit in the signal processing module by radio, so as to realize the rapid return of large-capacity data of the load working status parameters and business information; The data storage module divides storage areas of different priorities, and with the help of the file management system, it can perform file reading operations according to actual needs. It is used to store comprehensive and high-frequency state parameters collected by the measurement and control link signal processing unit in the signal processing module and to store remote sensing and reconnaissance data business information generated by other business loads; The payload monitoring module autonomously generates work instructions based on the mission planning and the real-time working status of the satellite, and distributes them to the data storage module, signal processing module, measurement and control transceiver antenna and data transmission antenna for execution; at the same time, it can receive control instructions sent uplink through the measurement and control link.

2. According to claim 1, a system for improving the application efficiency of low-orbit satellite measurement, control and data transmission functions, characterized in that: The payload monitoring module establishes links with the measurement and control terminal and the data transmission terminal of the ground integrated information station, and performs calculations based on the mission plan, the real-time position of the satellite, and the pre-stored ground station position and capability parameters; And according to the communication capability of the ground station, the corresponding data transmission rate adjustment process is performed; If the ground station has both the measurement and control link capability and the data transmission link capability, proceed as follows: Step 201, power on the measurement and control link signal processing unit, the data transmission link signal processing unit, the load monitoring module, the measurement and control transceiver antenna, the data transmission storage module and the data transmission transmitting antenna, and configure the working parameters; Step 202, the satellite simultaneously establishes links with the measurement and control terminal and the data transmission terminal of the ground station; Step 203, the satellite's tracking and control link signal processing unit transmits the collected telemetry information to the data transmission link signal processing unit, and the data transmission link signal processing unit then transmits the telemetry information and the information in the data transmission storage module; Step 204, in the data transmission working state, read and send data according to the priority order of the files in the data storage unit; or configure the priority of the downloaded files through the measurement and control uplink, and after the setting is completed, use the digital transmission satellite-to-ground link to download the files with the corresponding priority; Step 205, the data link signal processing unit in the signal processing module communicates at the lowest information rate in the initial state; after the data transmission receiving device in the ground integrated information station correctly receives the signal, it estimates the receiving signal-to-noise ratio and reports the status information through the measurement and control uplink; Step 206, the digital signal processing module makes a judgment according to the preset modulation and coding module input table; Step 207: The data transmission link signal processing unit performs adjustment and starts data transmission.

3. A system for improving the application efficiency of low-orbit satellite measurement, control and data transmission functions according to claim 2, characterized in that: If the ground station only has the capability of tracking and controlling the link, proceed as follows: Step 101, power on the measurement and control link signal processing unit, the load monitoring module, the measurement and control transceiver antenna, and the data transmission storage module, and complete the working parameter configuration; Step 102, the satellite establishes a connection with the measurement and control terminal of the ground station; Step 103, the measurement and control link signal processing unit collects and distributes the working state parameters to the data storage module, the signal processing module, the measurement and control transceiver antenna and the data transmission transmitting antenna, and then extracts the collected parameters and transmits the extracted information through the measurement and control downlink; At the same time, all collected status parameters are transmitted to the data storage unit for storage.

4. A system for improving the application efficiency of low-orbit satellite measurement, control and data transmission functions according to claim 2, characterized in that: If the ground station only has data link capability, proceed as follows: Step 301, power on the data transmission link signal processing unit, the load monitoring module, the data transmission storage module, and the data transmission transmitting antenna and configure the working parameters; Step 302: The satellite establishes a link with the ground data transmission terminal and sends the stored data at a fixed rate and according to the priority.

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