Data specification method for general data frame and satellite-to-ground and satellite-to-satellite information flow applicable to space communication technology

Abstract

The present invention provides a data standard method for a universal data frame applicable to space communication technology and a satellite-to-ground and inter-satellite information flow. The universal data frame applicable to space communication technology includes: a frame synchronization header, a frame length type, a source address, a destination address, an intra-satellite topology node, an application data type, an application data frame count, an application data valid field, and a frame check. The universal data frame applicable to space communication technology of the present application standardizes the satellite-to-ground and inter-satellite information frame formats in a unified manner, which is beneficial to improving the transmission efficiency of information in sharing or mutual backup situations; reducing the maintenance cost of data by ground stations; and improving the bandwidth utilization of link backup in normal mode and emergency mode, thereby improving the reliability of the system.

Description

Technical Field

[0001] The present invention relates to the field of space communication technology, and in particular to the field of satellite-to-ground and inter-satellite spacecraft communication technology. Background Art

[0002] At present, the space communication network has the problem of inconsistent protocol frame formats for each link, which leads to waste of information bandwidth when sharing or backing up information, and seriously reduces communication efficiency. Summary of the invention

[0003] In order to overcome the above-mentioned technical defects, the first aspect of the present invention provides a universal data frame suitable for space communication technology, which includes: a frame synchronization header, a frame length type, a source address, a destination address, an intra-satellite topology node, an application data type, an application data frame count, an application data valid field and a frame check.

[0004] Furthermore, the frame synchronization header is a data content in a fixed format, which is used by the data receiver to quickly and accurately search for the starting position of the data frame; for variable-length data frames, the frame length type is used to enable the receiver to quickly read and accurately obtain the information content of an entire frame for data verification; for multi-point to multi-point information transmission, the source address is used to clarify the sending address of the data frame; for multi-point to multi-point information transmission, the destination address is used to clarify the receiving address of the data frame; the intra-satellite topology node is the intra-satellite routing address, which is used for the master control computer to allocate data destinations according to the node address; the application data type is used to define and divide the data type transmitted in space; the application data frame count refers to the number of frames with the same application data type sent, and the count is increased by 1 each time a frame of the same application data type is sent; the frame check refers to the result obtained by checking the entire data frame content.

[0005] Frame synchronization header: data content in a fixed format, used by the data receiver to quickly and accurately search for the start position of the data frame. 8-bit data can be used, such as 0xEB90EB90.

[0006] Frame length type: For variable-length data frames, the frame length type is used by the receiver to quickly read and accurately obtain the information content of a whole frame for data verification. It can occupy 4-bit width data for type distinction.

[0007] Source address: For multi-point to multi-point information transmission, the sending address of the data frame is clarified. For example, when transmitting space information frames, the satellite address word or ground station address word of the sending data frame can be clarified, and 5-bit width data can be used for address distinction.

[0008] Destination address: For multi-point to multi-point information transmission, the receiving address of the data frame is clarified. For example, when transmitting space information frames, the satellite address word or ground station address word of the receiving data frame can be clarified, and 5-bit width data can be used for address distinction.

[0009] Intra-satellite topological node: Intra-satellite routing address. The master control computer allocates data destination according to the node address and can occupy 5-bit width data to distinguish the intra-satellite node addresses.

[0010] Application data type: The type of data transmitted in space, for example, can be divided into remote control data, telemetry data, scientific data, etc. It can occupy 8 bits of width for data type definition and division.

[0011] Application data frame count: Each time a frame of the same application data type is sent, the count is increased by 1. It can be represented by 8-bit wide data.

[0012] Frame check: The result obtained by checking the entire data frame content can occupy 8-bit width data to represent the check result.

[0013] Different types of source data are differentiated based on source address, data type, and data length, and the data content is generated in real time according to the application purpose.

[0014] Furthermore, according to different application data types, the frame length types include long frames and short frames. Uplink remote control commands use short frames, and downlink telemetry and scientific exploration data use long frames. There is no clear standard for dividing long frames and short frames. Different data types have relatively long and short frames.

[0015] Furthermore, the source addresses and destination addresses of the ground stations and satellite nodes in the same application domain use the same numbering system.

[0016] Furthermore, addresses with unified numbers in the same application domain are managed in a networked manner, and any address can generate source data and initiate data transmission in the network.

[0017] Furthermore, the information transmission between the intra-satellite topological nodes adopts an end-to-end transmission protocol. After the destination address star receives the data frame, it first performs a check. After the check is correct, it initiates the intra-satellite flow according to the intra-satellite topological nodes, the intermediate nodes transparently forward it, and the terminal nodes disassemble the frame for application.

[0018] Furthermore, the application data types are divided according to the application characteristics of the satellite constellation, including but not limited to: platform remote control instructions, platform telemetry data, payload remote control instructions, payload telemetry data, payload observation data, payload measurement data, etc.

[0019] The second aspect of the present invention provides a data standardization method for satellite-to-ground and inter-satellite information flows, which uses the above-mentioned universal data frame applicable to space communication technology as a unified information frame format for information flow transmission between satellites and ground stations and between satellites, thereby realizing standardized processing of data.

[0020] Compared with the prior art, the above technical solution has the following beneficial effects:

[0021] The universal data frame applicable to space communication technology of this application unifies and standardizes the information frame format between satellite and ground and between satellites. (1) The space communication network adopts a unified information frame format in the process of transmitting information flows in each link, and networked shared data can be quickly formed between satellites, which are transmitted to the ground through the satellite-to-ground high-speed link for unified scheduling and command on the ground, thereby improving the transmission efficiency of information in the case of sharing or mutual backup; (2) The use of a unified information frame format can realize fast end-to-end transmission of satellite-to-ground and between satellites, reducing the maintenance cost of data for ground stations; (3) The use of a unified information frame format can improve the bandwidth utilization of link backup in normal mode and emergency mode, thereby improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a unified information stream data frame format;

[0023] Figure 2 Unify the application scenarios of satellite-to-earth and inter-satellite data frame formats;

[0024] Figure 3 This is an application scenario for intra-satellite information flow transmission. DETAILED DESCRIPTION

[0025] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0026] This embodiment provides a method for standardizing data of satellite-ground and inter-satellite information flows, using the above-mentioned universal data frame applicable to space communication technology as a unified information frame format for information flow transmission between satellites and ground stations and between satellites, thereby realizing standardized processing of data. Figure 1 As shown, this embodiment constructs a universal data frame suitable for space communication technology based on the design and implementation at the software level, which includes: frame synchronization header, frame length type, source address, destination address, intra-satellite topology node, application data type, application data frame count, application data valid field and frame check.

[0027] Frame synchronization header: data content in a fixed format, used by the data receiver to quickly and accurately search for the start position of the data frame. 8-bit data can be used, such as 0xEB90EB90.

[0028] Frame length type: For variable-length data frames, the frame length type is used by the receiver to quickly read and accurately obtain the information content of a whole frame for data verification. It can occupy 4-bit width data for type distinction. According to different application data types, the frame length type is a long frame or a short frame with a rated frame length. For example, the uplink remote control command uses a short frame, and the downlink telemetry and scientific detection data uses a long frame. There is no clear standard for dividing long frames and short frames. Different data types have relatively long and short frames.

[0029] Source address: For multi-point to multi-point information transmission, the sending address of the data frame is clarified. For example, when transmitting space information frames, the satellite address word or ground station address word of the sending data frame can be clarified, and 5-bit width data can be used for address distinction.

[0030] Destination address: For multi-point to multi-point information transmission, the receiving address of the data frame is clearly defined. For example, when transmitting space information frames, the satellite address word or ground station address word of the receiving data frame can be clearly defined, and 5-bit width data can be used to distinguish the addresses. The source address and destination address of the ground station and satellite node in the same application domain use the same numbering system. The addresses with unified numbers in the same application domain are managed in a networked manner. Any address can generate source data and initiate data transmission in the network.

[0031] Intra-satellite topological node: Intra-satellite routing address. The master control computer allocates data destination according to the node address and can occupy 5-bit width data to distinguish the intra-satellite node addresses.

[0032] Application data type: the data type transmitted in space, including but not limited to: platform remote control commands, platform telemetry data, payload remote control commands, payload telemetry data, payload observation data, payload measurement data, etc. It can occupy 8 bits of width for data type definition and division.

[0033] Application data frame count: Each time a frame of the same application data type is sent, the count is increased by 1. It can be represented by 8-bit wide data.

[0034] Frame check: The result obtained by checking the entire data frame content can occupy 8-bit width data to represent the check result.

[0035] Different types of source data are differentiated based on source address, data type, and data length, and the data content is generated in real time according to the application purpose.

[0036] The general data frame provided in this embodiment is applicable to the application scenarios of satellite-to-ground information flow transmission and intra-satellite information flow transmission:

[0037] 1. Application scenarios of unified data frame format between satellite, ground and satellite

[0038] like Figure 2 As shown, the application scenarios of satellite-to-ground and inter-satellite information flow transmission include but are not limited to the following scenarios:

[0039] (1) Space-ground integrated information network

[0040] The space-ground integrated information network is composed of space satellites and ground nodes, and the space-based network and the ground network are integrated and developed. At present, under the unified network protocol system, it has multiple communication means such as microwave transmission and laser transmission. It uses the mechanism of relying on ground stations for satellite-to-ground communication during the visible time of ground measurement and control, and inter-satellite interconnection during the invisible time of ground measurement and control, to ensure the space-ground integrated information routing and end-to-end information transmission, and realize communication support on a large time and space scale.

[0041] (2) Navigation satellite communication system

[0042] The navigation satellite communication system has built a huge satellite-to-ground collaborative operation network consisting of more than 30 satellites and more than 50 ground stations through satellite-to-ground intersatellite links. Satellite measurement and control management data frames are uploaded from ground measurement and control stations, and satellite operation management data frames are uploaded from ground operation and control stations. Measurement and control management and operation and control management can be uploaded in the same information frame format; inter-satellite transmission of measurement and control instructions, measurement and control data, and operation and control information can also be transmitted in a unified information frame format.

[0043] (3) Deep Space Communications

[0044] At present, the deep space communication network is composed of space constellation nodes, detector nodes and ground nodes. The distance between network nodes is large, the amount of data between nodes is large and data sharing is required; in the future, deep space exploration will involve the coordinated work of multiple spacecraft such as planetary rovers, aircraft, and landers in the planetary surface network, and there will be a large amount of information in various forms (scientific data, audio / video, etc.) that needs to be shared between satellites and multiple spacecraft. The use of a unified data frame format for transmission and flexible and rapid networking will bring convenience to the throughput and compatibility of the deep space communication network.

[0045] 2. Application scenarios of intra-satellite information flow transmission

[0046] like Figure 3 As shown in the figure, in the application scenario of intra-satellite information flow transmission, the control system of any satellite mainly includes the platform main control computer and the payload main control computer. The platform main control computer is used to receive and control information including but not limited to energy management information, thermal control management information, mechanism control information, attitude and orbit control information, telemetry and remote control information, and payload management information. The payload main control computer is used to receive and control a number of payload control information. The platform main control computer and the payload main control computer use a unified universal data frame for information exchange and transmission.

[0047] The general data frame applicable to space communication technology in this embodiment includes: frame synchronization header, frame length type, source address, destination address, intra-satellite topological node, application data type, application data frame count, application data valid domain and frame check. According to different application data types, the frame length type is a long frame or a short frame of the rated frame length. Uplink remote control instructions use short frames, and downlink telemetry and scientific detection data use long frames. The addresses with unified numbers in the same application domain are managed in a networked manner. Any address can generate source data and initiate data transmission in the network. In order to facilitate network maintenance, a ground station can be defined as a network administrator responsible for network maintenance and troubleshooting. 2) Extra-satellite information flows within the satellite, and the end-to-end transmission protocol of extra-satellite transmission is used. Whoever uses it, de-frames it. The information transmission between the intra-satellite topological nodes adopts an end-to-end transmission protocol. After the destination address star receives the data frame, it first performs a check. After the check is correct, according to the intra-satellite topological node, the intra-satellite flow is initiated, the intermediate node transparently forwards, and the end node de-frames the application. After receiving the data frame, the destination address satellite first performs verification. After the verification is correct, it initiates the intra-satellite flow according to the intra-satellite topology nodes, transparently forwards the intermediate nodes, and disassembles the frames for application at the terminal nodes. The application data types are divided according to the application characteristics of the satellite constellation.

[0048] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A general data frame suitable for space communication technology, characterized in that: Including in order: Frame synchronization header, frame length type, source address, destination address, intra-satellite topology node, application data type, application data frame count, application data valid field and frame check; The frame synchronization header is a data content with a fixed format, which is used by the data receiver to quickly and accurately search for the starting position of the data frame; For variable-length data frames, the frame length type is used to enable the receiver to quickly read and accurately obtain the information content of an entire frame for data verification; For multipoint to multipoint information transmission, the source address is used to specify the sending address of the data frame; for multipoint to multipoint information transmission, the destination address is used to specify the receiving address of the data frame; The intra-satellite topology node is the intra-satellite routing address, which is used by the master control computer to allocate data destinations according to the node address; the application data type is used to define and divide the data type transmitted in space; the application data frame count refers to the number of frames with the same application data type sent, and the count increases by 1 each time a frame with the same application data type is sent; the frame check refers to the result obtained by checking the content of the entire data frame; According to different application data types, the frame length types include long frames and short frames. Uplink remote control commands use short frames, and downlink telemetry and scientific exploration data use long frames. The information transmission between the intra-satellite topology nodes adopts an end-to-end transmission protocol. After receiving the data frame, the destination address star first performs a check. After the check is correct, the intra-satellite flow is initiated according to the intra-satellite topology node, the intermediate node transparently forwards, and the terminal node disassembles the frame for application; The application data types are divided according to the application characteristics of the satellite constellation.

2. The universal data frame applicable to space communication technology as claimed in claim 1, characterized in that: The source and destination addresses of ground stations and satellite nodes in the same application domain use the same numbering system.

3. The universal data frame applicable to space communication technology as claimed in claim 2, characterized in that: Addresses with unified numbers in the same application domain are managed in a networked manner. Any address can generate source data and initiate data transmission in the network.

4. A data standardization method for satellite-to-ground and inter-satellite information flow, characterized in that: The universal data frame applicable to space communication technology as described in any one of claims 1 to 3 is used as a unified information frame for information flow transmission between a satellite and a ground station and between satellites, thereby realizing standardized processing of data.

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