CN117081643A - Data transmission method and system for unified space data link network - Google Patents

Data transmission method and system for unified space data link network Download PDF

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Publication number
CN117081643A
CN117081643A CN202310921937.1A CN202310921937A CN117081643A CN 117081643 A CN117081643 A CN 117081643A CN 202310921937 A CN202310921937 A CN 202310921937A CN 117081643 A CN117081643 A CN 117081643A
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data
satellite
network
space
address
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周军
吴侃侃
李林伟
汪少林
陈议
王驰
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Shanghai Institute of Satellite Engineering
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Shanghai Institute of Satellite Engineering
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18515—Transmission equipment in satellites or space-based relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Radio Relay Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The application provides a data transmission method and a system for a unified space data link network, which consists of a plurality of satellites and a plurality of ground station systems, wherein each satellite consists of a plurality of network terminals and a satellite-borne gateway to form a satellite-borne IP sub-network, each ground station system consists of a control center and a ground gateway to form a ground IP sub-network, the ground gateway and the satellite-borne gateway transmit satellite-ground data through a space link sub-network, and different satellite-borne gateways transmit inter-satellite data through a space link sub-network. The application can simultaneously bear telemetry and remote control data by using a unified protocol and a processing paradigm, and can efficiently and flexibly meet the data transmission requirements of complex star-to-ground, inter-star and intra-star networks.

Description

Data transmission method and system for unified space data link network
Technical Field
The application relates to the technical field of space and space-borne communication networks, in particular to a data transmission method and system of a unified space data link network.
Background
Along with the continuous enhancement of requirements of satellite networking formation flight, complex service interconnection mutual control, inter-satellite task collaborative planning and the like, the interconnection relationship between satellite-borne electronic devices in satellites and the interconnection relationship between satellites not only meet the transmission requirements of satellite health states, satellite control commands and satellite original remote sensing data, but also meet the transmission requirements of effective target data after processing the original remote sensing data on the satellites, remote sensing data fusion processing data among multiple satellites and task planning collaborative data. The number, types and frequencies of information interactions within and between satellites have increased dramatically, resulting in more complex connection relationships between satellite-borne electronic devices and diverse types of data transmissions.
Therefore, an IP-based on-board Ethernet switching network is constructed, an information interaction barrier between electronic devices in the satellite is opened, a satellite-to-ground and inter-satellite network transmission system is constructed based on a CCSDS protocol and a TCP/IP protocol, unification of the in-satellite network and the inter-satellite network is realized, a flattened connection relationship is constructed, and cost brought by the interconnection barrier is reduced to the greatest extent. Therefore, the high-efficiency data transmission based on the integrated on-board information network realizes the cooperation of the high-efficiency space-based networking observation and the satellite group task planning by applying energization.
The literature search of the prior art shows that various aerospace research institutions and universities at home and abroad have developed complex network constellation data transmission research.
In patent document "a label-based space-based network star-earth integrated switching method" of publication number CN112995033a, it is proposed to separate a space-based core route and an access route, and implement forwarding of a space-based switching frame by using a mapping relationship of an IP packet, a satellite node number and a port number of a satellite-borne switch. Patent document CN114124191B, "a networking system suitable for a low-orbit constellation network", proposes that a ground networking controller performs whole-network switching control, and a satellite-borne tag packaging unit performs mapping of inter-satellite forwarding identifiers and IP data packets. The networking transmission method relies on ground control, and the problems of fusion transmission of data in an intra-satellite network and mixed transmission of multi-service data in an application layer are not solved.
An AOS transmission frame-based construction method for adapting to multi-inter-satellite link data transmission is proposed in patent documents of publication number CN113300756a, an inter-satellite link mesh routing system based on the CCSDS specification, and publication number CN111917458B, a spatial data processing node device based on the CCSDS specification, and mainly relies on a spatial data link layer AOS frame structure to realize transmission of different inter-satellite links and hybrid transmission of multiple service data.
The patent document CN112865852B discloses a method for determining a physical link based on the location information of a destination address satellite, and establishes a correspondence between network layer IP packets and a data link layer through the location relationship between satellites and between the satellites.
Searching and analyzing the prior art can find that the following problems exist:
1) The existing method can not solve the problem of integrated high-efficiency unified interconnection among the satellite, the inter-satellite and the intra-satellite, and the terminal equipment and the ground equipment in different satellites can not form a flattened interconnection relationship, so that the hardware resource cost for converting the protocols among the satellite, the inter-satellite and the intra-satellite is high;
2) The existing method fails to solve the problem of high-efficiency unified mixed transmission of typical service data such as telemetry and remote control, and is still in telemetry frames and remote control frames application paradigms of a two-stage data structure of transmission frames-space data packets, and the identification and addressing functions of IP addresses are not effectively utilized.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a data transmission method and a system for a unified space data link network.
The application provides a data transmission system of a unified space data link network, which comprises: a satellite-borne IP sub-network, a ground IP sub-network and a space link sub-network;
the satellite-borne IP sub-network comprises a network terminal of a satellite and a satellite-borne gateway; the satellite-borne IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, wherein the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a space data packet format;
the ground IP sub-network comprises a control center of a ground station and a ground gateway; the ground IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, wherein the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a TCP data packet or UDP data packet format, and the application layer adopts a space data packet format;
the space link sub-network provides satellite-to-ground data transmission between the ground gateway and the satellite-borne gateway, and provides inter-satellite data transmission directly pressed by the satellite-borne gateways of different satellites; the space link sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, the physical layer adopts a radio frequency and modulation system, the data link layer adopts a unified space data link protocol USLP transmission frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a space data packet format.
Preferably, any network terminal of the satellite can generate a telemetry space data packet and a remote control space data packet marked by application process identifiers to be output externally, the telemetry space data packet and the remote control space data packet are respectively classified according to different destination IP space-borne host addresses of the telemetry space data packet and the remote control space data packet, the telemetry space data packets with different application process identifiers transmitted to the same destination IP space-borne host address are aggregated to form a telemetry IP data packet as a data field, the remote control space data packets with different application process identifiers transmitted to the same destination IP space-borne host address are aggregated to form a remote control IP data packet as a data field, a source IP address in the IP data packet header is the telemetry space data packet or the remote control space data packet, a network terminal IP address of a destination terminal of the telemetry space data packet or the remote control space data packet, and the destination IP address is the IP address of a destination terminal of the telemetry space data packet or a ground control center.
Preferably, if the destination IP on-board host address is the own star network terminal, forwarding the IP data packet to the own star destination network terminal through the own star on-board IP subnet; if the target IP spaceborne host address is other star network terminal or ground control center, the IP data packet is forwarded to the spaceborne gateway for further processing through the star IP sub-network.
Preferably, any control center of the ground station system can generate remote control space data packets marked by application process identifiers to be output externally, the remote control space data packets are classified according to different IP (Internet protocol) satellite-borne host addresses of the remote control space data packets, the remote control space data packets with different application process identifiers and transmitted to the same IP satellite-borne host address are aggregated as data fields to serve as data fields to form a remote control IP data packet, a source IP address in an IP data packet header is an IP address of a control center of a remote control space data packet generating end, the destination IP address is an IP address of a network terminal of the remote control space data packet destination end, and the control center forwards the generated IP data packet to a ground gateway for further processing through a ground IP sub-network.
Preferably, a satellite gateway of a satellite receives and analyzes a MAC frame forwarded by a satellite network terminal through a satellite-borne IP subnet of the satellite and acquires an IP data packet in a MAC frame data domain, receives and analyzes a unified spatial data link transmission frame forwarded by the satellite network terminal or a ground control center through a spatial link subnet and acquires an IP data packet in the transmission frame data domain, and the processing steps performed by the satellite gateway on the received IP data packet include:
if the spacecraft identifier in the target IP spaceborne host address is the star, forwarding the IP data packet to a target network terminal of the star through a target IP spaceborne sub-network according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites or ground station systems according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
step three, determining the next hop satellite IP address or the ground station system IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites or the IP addresses of the ground station system, aggregating the IP data packets of the same IP addresses of the next-hop satellites or the IP addresses of the ground station system, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite or the ground station system through the space link sub-network.
Preferably, a ground gateway of a ground station system receives and analyzes a MAC frame forwarded by a control center through a ground IP subnet and acquires a plurality of IP data packets in a MAC frame data domain, receives and analyzes a unified spatial data link transmission frame forwarded by a star network terminal through a spatial link subnet and acquires a plurality of IP data packets in a transmission frame data domain, and the processing steps performed by the ground gateway on the received IP data packets include:
the first step, if the spacecraft identifier in the target IP spaceborne host address is a local ground station system, the IP data packet is forwarded to a control center through a ground IP subnet according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
thirdly, determining the next hop satellite IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites, aggregating the IP data packets of the same next-hop satellite IP addresses, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite through the space link sub-network.
Preferably, the definition rule of the spatial link sub-network data link layer unified spatial data link transmission frame master spacecraft identifier, source or destination identifier field is as follows:
(1) If the IP data packets in the transmission frame data domain are all remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame;
(2) If the IP data packets in the transmission frame data domain are all telemetry data, a spacecraft identifier field in the main header of the transmission frame is a spacecraft identifier of a satellite at the transmitting end of the current transmission frame, and a source or destination identifier field indicates that the spacecraft identifier is a source of the transmission frame;
(3) If the IP data packet in the transmission frame data field is the mixed transmission of the remote control data and the remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame.
Preferably, the IP address in the network layer IP packet consists of a space subnet address and a space host address, specifically:
(1) The space subnet address represents the address number of the network where the satellite-to-ground communication is located;
(2) The satellite-borne host address represents equipment address numbers related to satellite-to-ground, inter-satellite and intra-satellite communication, comprises a spacecraft identifier and a terminal address, defines a unique-identification spacecraft identifier for each satellite and each ground station system, and defines a unique-identification terminal address for each network terminal, a satellite-borne gateway and each control center and ground gateway of each satellite and each ground station system.
Preferably, a mapping relation between a remote control space data packet source APID set generated by a network terminal and a destination IP spaceborne host address corresponding to the source APID is constructed at a satellite network terminal, and a mapping relation between a remote control space data packet destination APID set generated by the network terminal and a destination IP spaceborne host address corresponding to the destination APID is constructed; constructing a mapping relation between a target APID set of a remote control space data packet generated by a control center and a target IP satellite-borne host address corresponding to the target APID in a ground station system control center; constructing a satellite gateway and a ground gateway, and constructing a mapping relation between a target IP address and a GMAP ID; wherein, the GMAP ID is a set of all transmission frames on a transmission frame physical channel with the same spacecraft identifier, virtual channel and multiplexed access channel, and is a global, unique identification of the transmission frame in the spatial link sub-network physical channel.
According to the data transmission method of the unified space data link network, data transmission is carried out based on the data transmission system of the unified space data link network.
Compared with the prior art, the application has the following beneficial effects:
1. the application integrates the CCSDS space link protocol and the TCP/IP network protocol, and provides a beneficial design thought for realizing the integration of the star, the ground, the space and the flattened high-efficiency data transmission;
2. the application provides unified space data packet, IP data packet and transmission frame processing paradigm for each network node of the space-borne network, the space link network and the ground station system network, realizes the mixed processing of typical services such as telemetry, remote control and the like based on CCSDS space link protocol and TCP/IP network protocol, and effectively improves the service data processing benefit and the network link utilization efficiency;
3. the application provides a four-level data structure of a transmission frame-IP data packet-UDP data packet-space data packet, which optimizes the identification and addressing modes of a spacecraft identifier + an application process identifier under the traditional two-level data structure of the transmission frame-space data packet into the identification and addressing modes of the spacecraft identifier + an IP address + the application process identifier, enriches the identification means, expands the addressing modes and more effectively serves the data transmission of a complex network;
4. the application adopts the unified space data link protocol USLP, and provides a flexible and universal space data link layer processing method for remote measurement data transmission, remote control data transmission and remote measurement and remote control data mixed transmission between the stars and the ground.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a data transmission method and system for a unified spatial data link network;
FIG. 2 is a schematic diagram of a satellite-borne IP subnet protocol stack;
FIG. 3 is a schematic diagram of a spatial link sub-network protocol stack;
FIG. 4 is a unified space data link protocol transport frame format;
FIG. 5 is a spatial data packet format;
fig. 6 is a schematic diagram of the correspondence between the APID of the spatial data packet, the destination IP address of the spatial data packet, and the GMAP ID of the transmission frame carrying the spatial data packet.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.
The method provides a unified processing paradigm for satellite-to-ground, inter-satellite and intra-satellite integrated, flattened and multi-service hybrid transmission, and has good universality, flexibility and expandability.
As shown in fig. 1, a unified spatial data link network provided in accordance with the present application includes a plurality of satellites and a plurality of ground station systems. Each satellite comprises a satellite-borne IP sub-network mainly composed of a plurality of network terminals and a satellite-borne gateway, and each ground station system comprises a ground IP sub-network composed of a control center and a ground gateway. The ground gateway and the satellite-borne gateway transmit satellite-ground data through a space link sub-network of a unified space data link network, and the satellite-borne gateways of different satellites transmit inter-satellite data through the space link sub-network.
The protocol stacks of the satellite-borne IP sub-network, the ground IP sub-network and the space link sub-network are specifically as follows:
(1) The satellite-borne IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, as shown in figure 2, the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a space data packet format;
(2) The ground IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, wherein the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a TCP data packet or UDP data packet format, and the application layer adopts a space data packet format;
(3) The spatial link sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, as shown in fig. 3, the physical layer adopts a radio frequency and modulation system, the data link layer adopts a unified spatial data link protocol (Unified Space Data Link Protocol, USLP) transmission frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a spatial data packet format.
Unified spatial data link protocol (Unified Space Data Link Protocol, USLP) transmission frame format as shown in fig. 4, USLP provides a flexible transmission frame structure, and the main header and the data field header have enough fields and scalability to support the transmission of various types of spatial application data to unify the star-to-ground, inter-star data link layer protocols and transmission frame processing.
Spatial data packet formats as shown in fig. 5, variable length data units are created, stored, transmitted, and utilized via a single, generic application layer data structure for telemetry, remote control data transmission between one or more spatial links and between multiple on-board networks.
The satellite arbitrary network terminal can generate a plurality of telemetry space data packets and remote control space data packets marked by application process identifiers to be output externally, the telemetry space data packets and the remote control space data packets are respectively classified according to different destination IP spaceborne host addresses of the telemetry space data packets and the remote control space data packets, the telemetry space data packets with different application process identifiers transmitted to the same destination IP spaceborne host addresses are aggregated to form a telemetry IP data packet as a data field, the remote control space data packets with different application process identifiers transmitted to the same destination IP spaceborne host addresses are aggregated to form a remote control IP data packet as a data field, the source IP address in the IP data packet header is the telemetry space data packet or the remote control space data packet, the network terminal IP address of the destination IP address of the telemetry space data packet or the remote control space data packet is the network terminal IP address of the destination terminal or the ground control center IP address of the remote control space data packet.
If the target IP spaceborne host address is the star network terminal, forwarding the IP data packet to the star target network terminal through the star IP subnet; if the target IP spaceborne host address is other star network terminal or ground control center, the IP data packet is forwarded to the spaceborne gateway for further processing through the star IP sub-network.
The ground station system arbitrary control center can generate a plurality of remote control space data packets marked by application process identifiers to be output externally, the remote control space data packets are classified according to different target IP satellite-borne host addresses of the remote control space data packets, the remote control space data packets with different application process identifiers transmitted to the same target IP satellite-borne host addresses are aggregated to serve as data fields to form a type of remote control IP data packet, a source IP address in an IP data packet header is a remote control space data packet generation end control center IP address, the target IP address is a remote control space data packet target end network terminal IP address, and the control center forwards the generated IP data packet to a ground gateway through a ground IP sub-network for further processing.
The method for processing the received IP data packets comprises the following steps that a satellite-borne gateway of a satellite receives and analyzes a MAC frame forwarded by a satellite-borne IP sub-network of the satellite and acquires a plurality of IP data packets in a MAC frame data domain, and receives and analyzes a unified space data link transmission frame forwarded by a satellite-borne network terminal or a ground control center through a space link sub-network and acquires a plurality of IP data packets in the transmission frame data domain, wherein the processing steps of the satellite-borne gateway comprise:
if the spacecraft identifier in the target IP spaceborne host address is the star, forwarding the IP data packet to a target network terminal of the star through a target IP spaceborne sub-network according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites or ground station systems according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
step three, determining the next hop satellite IP address or the ground station system IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites or the IP addresses of the ground station system, aggregating the IP data packets of the same IP addresses of the next-hop satellites or the IP addresses of the ground station system, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite or the ground station system through the space link sub-network.
The ground gateway of the ground station system receives and analyzes the MAC frame forwarded by the control center through the ground IP sub-network and acquires a plurality of IP data packets in the MAC frame data domain, receives and analyzes the unified space data link transmission frame forwarded by the other star network terminal through the space link sub-network and acquires a plurality of IP data packets in the transmission frame data domain, and the processing steps of the ground gateway on the received IP data packets comprise:
the first step, if the spacecraft identifier in the target IP spaceborne host address is a local ground station system, the IP data packet is forwarded to a control center through a ground IP subnet according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
thirdly, determining the next hop satellite IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites, aggregating the IP data packets of the same next-hop satellite IP addresses, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite through the space link sub-network.
Telemetry, remote control data, when transmitted over a spatial link, typically includes an uplink satellite-to-ground remote control transmission frame, a downlink satellite-to-ground telemetry transmission frame, an inter-satellite forward link transmission frame, and an inter-satellite return link transmission frame. The conventional format and usage of the uplink and downlink transmission frames of the star is generally related to the transmitted traffic, but the forward and reverse links between the stars are generally not able to bind with the traffic data. For example, the inter-satellite forward link may transmit both telemetry data from his star and remote control data from his star. And the unified space data link protocol is adopted to realize the generalized design of the space data link layer protocol, and the data interaction of different services is opened. The definition rule of the space link sub-network data link layer unified space data link transmission frame master header spacecraft identifier and source or destination identifier field is as follows:
(1) If the IP data packets in the transmission frame data domain are all remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame;
(2) If the IP data packets in the transmission frame data domain are all telemetry data, a spacecraft identifier field in the main header of the transmission frame is a spacecraft identifier of a satellite at the transmitting end of the current transmission frame, and a source or destination identifier field indicates that the spacecraft identifier is a source of the transmission frame;
(3) If the IP data packet in the transmission frame data field is the mixed transmission of the remote control data and the remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame.
The IP address in the network layer IP data packet consists of a space subnet address and a satellite-borne host address, and specifically comprises the following steps:
(1) The space subnet address represents the address number of the network where the satellite-to-ground communication is located;
(2) The satellite-borne host address represents equipment address numbers related to satellite-to-ground, inter-satellite and intra-satellite communication, comprises a spacecraft identifier and a terminal address, defines a unique-identification spacecraft identifier for each satellite and each ground station system, and defines a unique-identification terminal address for each network terminal, a satellite-borne gateway and each control center and ground gateway of each satellite and each ground station system.
The correspondence between the spatial data packet application process identifier (Application Process Identifier, APID), the spatial data packet destination IP address, and the transport frame global multiplexing access channel identifier (Global Multiplexer Access Point Identifier, GMAP ID) carrying the spatial data packet is as shown in fig. 6, and specifically includes:
(1) A mapping relation between a remote control space data packet source APID set generated by a network terminal and a destination IP spaceborne host address corresponding to the source APID is constructed at a satellite network terminal, and a mapping relation between the remote control space data packet destination APID set generated by the network terminal and a destination IP spaceborne host address corresponding to the destination APID is constructed;
(2) Constructing a mapping relation between a target APID set of a remote control space data packet generated by a control center and a target IP satellite-borne host address corresponding to the target APID in a ground station system control center;
(3) And constructing a mapping relation between the destination IP address and the GMAP ID in the space-borne gateway and the ground gateway.
Wherein, the GMAP ID is a set of all transmission frames on a transmission frame physical channel with the same spacecraft identifier, virtual channel and multiplexed access channel, and is a global, unique identification of the transmission frame in the spatial link sub-network physical channel.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.

Claims (10)

1. A data transmission system for a unified spatial data link network, comprising: a satellite-borne IP sub-network, a ground IP sub-network and a space link sub-network;
the satellite-borne IP sub-network comprises a network terminal of a satellite and a satellite-borne gateway; the satellite-borne IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, wherein the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a space data packet format;
the ground IP sub-network comprises a control center of a ground station and a ground gateway; the ground IP sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, wherein the physical layer adopts an Ethernet IEEE802.3 protocol physical layer specification, the data link layer adopts a MAC frame format, the network layer adopts an IP data packet format, the transmission layer adopts a TCP data packet or UDP data packet format, and the application layer adopts a space data packet format;
the space link sub-network provides satellite-to-ground data transmission between the ground gateway and the satellite-borne gateway, and provides inter-satellite data transmission directly pressed by the satellite-borne gateways of different satellites; the space link sub-network adopts a physical layer, a data link layer, a network layer, a transmission layer and an application layer protocol stack, the physical layer adopts a radio frequency and modulation system, the data link layer adopts a unified space data link protocol USLP transmission frame format, the network layer adopts an IP data packet format, the transmission layer adopts a UDP data packet format, and the application layer adopts a space data packet format.
2. The data transmission system of the unified space data link network according to claim 1, wherein any network terminal of the satellite can generate telemetry space data packets and remote control space data packets marked by application process identifiers to be output externally, the telemetry space data packets and the remote control space data packets are classified according to different destination IP space host addresses of the telemetry space data packets and the remote control space data packets, the telemetry space data packets with different application process identifiers transmitted to the same destination IP space host addresses are aggregated as data fields to form a telemetry IP data packet, the remote control space data packets with different application process identifiers transmitted to the same destination IP space host addresses are aggregated as data fields to form a remote control IP data packet, a source IP address in the IP data packet is a telemetry space data packet or a remote control space data packet generating end network terminal IP address, and the destination IP address is a telemetry space data packet or a remote control space data packet destination end network terminal or a ground control center IP address.
3. The data transmission system of the unified space data link network according to claim 2 wherein if the destination IP on-board host address is the own-star network terminal, the IP data packet is forwarded to the own-star destination network terminal via the own-star on-board IP subnet; if the target IP spaceborne host address is other star network terminal or ground control center, the IP data packet is forwarded to the spaceborne gateway for further processing through the star IP sub-network.
4. The data transmission system of the unified space data link network according to claim 2, wherein any control center of the ground station system can generate remote control space data packets with application process identifier marks to be outputted externally, the remote control space data packets are classified according to different destination IP space-borne host addresses of the remote control space data packets, the remote control space data packets with different application process identifier marks transmitted to the same destination IP space-borne host addresses are aggregated as data fields to serve as data fields to form a type of remote control IP data packet, a source IP address in an IP data packet header is an IP address of a control center of a remote control space data packet generating end, the destination IP address is an IP address of a destination network terminal of the remote control space data packet, and the control center forwards the generated IP data packet to a ground gateway through a ground IP subnet for further processing.
5. The data transmission system of the unified space data link network according to claim 4 wherein the satellite gateway receives and analyzes the MAC frame forwarded by the own satellite network terminal through the own satellite IP subnet and acquires the IP packet in the MAC frame data domain, receives and analyzes the unified space data link transmission frame forwarded by the own satellite network terminal or the ground control center through the space link subnet and acquires the IP packet in the transmission frame data domain, and the processing step performed by the satellite gateway on the received IP packet includes:
if the spacecraft identifier in the target IP spaceborne host address is the star, forwarding the IP data packet to a target network terminal of the star through a target IP spaceborne sub-network according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites or ground station systems according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
step three, determining the next hop satellite IP address or the ground station system IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites or the IP addresses of the ground station system, aggregating the IP data packets of the same IP addresses of the next-hop satellites or the IP addresses of the ground station system, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite or the ground station system through the space link sub-network.
6. The data transmission system of unified space data link network according to claim 5 wherein the ground gateway of the ground station system receives and parses the MAC frame forwarded by the control center through the ground IP subnet and acquires a plurality of IP packets in the MAC frame data domain, receives and parses the unified space data link transmission frame forwarded by the his star network terminal through the space link subnet and acquires a plurality of IP packets in the transmission frame data domain, the processing step performed by the ground gateway on the received IP packets comprising:
the first step, if the spacecraft identifier in the target IP spaceborne host address is a local ground station system, the IP data packet is forwarded to a control center through a ground IP subnet according to the terminal address in the target IP spaceborne host address;
secondly, classifying all IP data packets which need to be forwarded to other satellites according to different destination IP satellite-borne host addresses, and aggregating the IP data packets of the same destination IP satellite-borne host addresses;
thirdly, determining the next hop satellite IP address according to the IP satellite-borne host address of the IP data packet destination and a routing algorithm;
and fourth, classifying the IP data packets according to the difference of the IP addresses of the next-hop satellites, aggregating the IP data packets of the same next-hop satellite IP addresses, forming a type of transmission frame as the data field of the unified space data link transmission frame, and outputting the transmission frame to the corresponding satellite through the space link sub-network.
7. The data transmission system of a unified spatial data link network according to claim 1 wherein the definition rules of the spatial link sub-network data link layer unified spatial data link transmission frame master spacecraft identifier, source or destination identifier fields are:
(1) If the IP data packets in the transmission frame data domain are all remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame;
(2) If the IP data packets in the transmission frame data domain are all telemetry data, a spacecraft identifier field in the main header of the transmission frame is a spacecraft identifier of a satellite at the transmitting end of the current transmission frame, and a source or destination identifier field indicates that the spacecraft identifier is a source of the transmission frame;
(3) If the IP data packet in the transmission frame data field is the mixed transmission of the remote control data and the remote control data, the spacecraft identifier field in the main header of the transmission frame is the spacecraft identifier of the satellite at the receiving end of the current transmission frame, and the source or destination identifier field indicates that the spacecraft identifier is the destination of the transmission frame.
8. The data transmission system of the unified space data link network according to claim 7 wherein the IP address in the network layer IP packet consists of a space subnet address and a space host address, specifically:
(1) The space subnet address represents the address number of the network where the satellite-to-ground communication is located;
(2) The satellite-borne host address represents equipment address numbers related to satellite-to-ground, inter-satellite and intra-satellite communication, comprises a spacecraft identifier and a terminal address, defines a unique-identification spacecraft identifier for each satellite and each ground station system, and defines a unique-identification terminal address for each network terminal, a satellite-borne gateway and each control center and ground gateway of each satellite and each ground station system.
9. The data transmission system of the unified space data link network according to claim 8 wherein a mapping relationship between a source APID set of telemetry space data packets generated by a satellite network terminal and a destination IP spaceborne host address corresponding to the source APID is constructed at the satellite network terminal, and a mapping relationship between a destination APID set of remote space data packets generated by the network terminal and a destination IP spaceborne host address corresponding to the destination APID is constructed; constructing a mapping relation between a target APID set of a remote control space data packet generated by a control center and a target IP satellite-borne host address corresponding to the target APID in a ground station system control center; constructing a satellite gateway and a ground gateway, and constructing a mapping relation between a target IP address and a GMAP ID; wherein, the GMAP ID is a set of all transmission frames on a transmission frame physical channel with the same spacecraft identifier, virtual channel and multiplexed access channel, and is a global, unique identification of the transmission frame in the spatial link sub-network physical channel.
10. A data transmission method of a unified spatial data link network, characterized in that data transmission is performed based on the data transmission system of the unified spatial data link network according to any one of claims 1 to 9.
CN202310921937.1A 2023-07-25 2023-07-25 Data transmission method and system for unified space data link network Pending CN117081643A (en)

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