Network connection collaborative information system under communication perspective

Abstract

The invention provides a network connection collaborative information system under a communication perspective, which is characterized in that inter-satellite and satellite-ground spatial data network protocol stacks adopt five layers of protocol stacks including a physical layer, a link layer, a network layer, a transmission layer and an application layer, a link center realizes physical layer processing, a network center realizes link layer and network layer processing, and a network center realizes network layer processing. The data center realizes transmission layer and application layer processing of satellite remote sensing load data, the task center realizes transmission layer and application layer processing of task collaborative data, and the service center realizes transmission layer and application layer processing of platform measurement and control data. From the perspective of spatial data network transmission, the network connection collaborative information system is provided, the processing flow of a spatial data network protocol and a corresponding product are planned, and under the development trend that spatial communication links are continuously increased, the communication protocol is continuously complicated and the data interaction frequency is continuously improved, the network connection collaborative information system is provided. Unified transmission processing of different types of data in satellite-ground and inter-satellite multi-heterogeneous links is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of spaceborne integrated information systems, and in particular, to a networked collaborative information system from the perspective of communication. Background Art

[0002] Traditionally, each satellite is used as an independent space-based sensor individual for detection and perception and payload data processing. The data processing tasks are processed locally or offloaded to the ground for processing, ignoring the feasibility of collaborative edge processing of the internal processing resources of the satellite and the processing resources of other surrounding satellites, that is, data transmission between satellites through inter-satellite links to collaboratively participate in the processing of the payload data of other satellites. The satellite nodes close to the space-based data generation source or the data application destination provide data processing services, and the overall benefit of real-time / near-real-time computing nearby is the highest, reducing bandwidth waste and access latency, and providing more efficient service guarantees for latency-sensitive and computationally intensive applications.

[0003] However, the product discrete and specialized design of traditional space-ground and inter-satellite links has large resource overheads, complex information interaction, and high reconstruction difficulty, which is not conducive to cross-network information sharing and resource utilization. An efficient, integrated, and flexible spaceborne information system is an effective means to reduce the overhead of long information transmission, processing, distribution, and application links, and is the basis for the high timeliness of space-based information transmission. It is necessary to combine the space information network transmission system and the satellite information system to lay a foundation for space-based information services with physical dispersion, information aggregation, and intelligent collaboration.

[0004] Through literature retrieval of the prior art, it is found that aerospace research institutions and universities at home and abroad have carried out research on satellite platform electronic information systems and network communication related technologies. Patent application document CN114513244A discloses an information system composed of a service center, a mission center, and a data center. The service center consists of several platform service units, the mission center consists of several crowd-sourced mission units, and the data center consists of several data service units. It is constructed by a series of standardized and generalized hardware modules based on a unified electronic architecture. This invention mainly focuses on data processing and transmission inside the satellite, and does not comprehensively integrate data processing and transmission services for intra-satellite and inter-satellite integration. Patent application document CN114466040A discloses a dual-plane network system composed of a control plane and a data plane, adopting a star-shaped, switched, full-duplex network architecture to meet the data transmission requirements of various types of on-board data on the same physical link and reduce the protocol conversion overhead during data transmission. This invention mainly focuses on the integrated design of intra-satellite network data transmission and does not consider the space network. Patent application document CN115441934A discloses an architecture composed of an inter-satellite routing link, an intra-satellite single-device, a platform integrated electronic device, and an SRIO interaction network system to achieve compatibility between the intra-satellite information network and the satellite constellation network. This invention conducts multi-functional comprehensive integration for the compatibility of multiple communication systems of data streams such as telemetry, telecontrol, payload, mission planning, attitude and orbit control, etc., and unifies intra-satellite data transmission through the SRIO network, but does not involve the processing process of space communication network protocols and corresponding products. Patent application document CN111917453A discloses a network routing center to achieve communication between multiple satellite subsystems, storage and management of the whole-satellite telemetry data, autonomous health management, reception and transmission of telemetry and telecontrol data, etc. Patent application document CN114124191A discloses a networking system applicable to a low-earth orbit constellation network, proposing that the ground networking controller conducts whole-network switching control, and the on-board tag encapsulation unit conducts inter-satellite forwarding identification and mapping of IP data packets. Patent application document CN111917458A discloses a space data processing node device based on the CCSDS specification, mainly relying on the AOS frame structure of the space data link layer to achieve transmission of different inter-satellite links and mixed transmission of various service data.

[0005] Retrieval and analysis of the prior art can reveal the following problems:

[0006] (1) In terms of the functional positioning and product interface division of the on-board system, the satellite is still regarded as a relatively single tool attribute such as remote sensing observation, navigation, communication, etc. for comprehensive integrated and generalized design, without breaking away from the traditional positioning of comprehensive electronic systems, measurement and control systems, data transmission systems, relay systems, inter-satellite communication systems, mission planning systems, etc. Under the development trend of space-based intelligence and networking, the definitions of some functions and products overlap, and the system intensification level still needs to be improved;

[0007] (2) In the aspects of spaceborne space communication and in-satellite data transmission, the types and frequencies of data interaction among satellites, between satellites and the ground, and within satellites have increased sharply. The number and systems of space communication links have been continuously increasing. Although the product integration and data transmission convenience have been improved through the application of high-performance processor components and high-bandwidth bus network technologies, and the resource overhead has been reduced, as a space-based node in the information world, the coupling relationship between information transmission protocols and information processing products has not been clearly sorted out. Summary of the Invention

[0008] Aiming at the defects in the prior art, the purpose of the present invention is to provide a networked collaborative information system from the perspective of communication.

[0009] The networked collaborative information system from the perspective of communication provided by the present invention includes five logical functional domains: a data center, a mission center, a service center, a network center, and a link center;

[0010] Bidirectional data communication is realized between different satellites through microwave and laser inter-satellite communication links, and bidirectional data communication is realized between satellites and the ground through microwave and laser satellite-ground communication links. The space data network protocol stack for inter-satellite and satellite-ground uses a five-layer protocol stack of physical layer, link layer, network layer, transport layer, and application layer;

[0011] The link center realizes the physical layer processing of inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the link centers between different satellites correspond one-to-one to complete the processing of the same protocol layer;

[0012] The network center realizes the link layer and network layer processing of inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the network centers between different satellites correspond one-to-one to complete the processing of the same protocol layer;

[0013] The data center realizes the transport layer and application layer processing of satellite remote sensing payload data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the data centers between different satellites correspond one-to-one to complete the processing of the same protocol layer;

[0014] The mission center realizes the transport layer and application layer processing of satellite mission collaborative data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the mission centers between different satellites correspond one-to-one to complete the processing of the same protocol layer;

[0015] The service center realizes the transport layer and application layer processing of satellite platform measurement and control data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the service centers between different satellites correspond one-to-one to complete the processing of the same protocol layer.

[0016] Preferably, the link center receives the data sent by the inter-satellite and satellite-ground communication links, extracts the effective signals of the microwave and laser physical channels, completes the parsing process of the physical layer frame format of the space data network protocol, and transfers the space data network protocol transport frame format encapsulation to the network center; it receives the space data network protocol transport frame format encapsulation transferred by the network center, and the link center completes the physical layer frame format encapsulation process, modulates the information data to the microwave and laser physical channels and then transmits it into space.

[0017] Preferably, the network center receives the space data network protocol transport frame format encapsulation transferred by the link center, performs the parsing of the transport frame protocol format, the parsing of the transport frame data field data transmission service, and the parsing process of the space link network encapsulation service, performs the parsing of the space data network protocol network layer data packet format and network addressing process, and transfers the space data network protocol transport layer data packet format encapsulation to the data center, the mission center, and the service center; it receives the space data network protocol transport layer data packet format encapsulation transferred by the data center, the mission center, and the service center, and the network center completes the network layer addressing and data packet format encapsulation process, completes the space link network encapsulation service, the transport frame data field data transmission service, and the transport frame format encapsulation process of the link layer, and transfers the transport frame format to the link center.

[0018] Preferably, the data center receives the space data network protocol transport layer data packet format encapsulation transferred by the network center, performs the data packet format parsing process, performs the application layer data packet format parsing process, extracts the application data field of the data packet, obtains the remote sensing payload data of other satellites for further processing; it receives the satellite remote sensing payload data obtained by this satellite, and the data center completes the application layer data packet format encapsulation process, completes the transport layer data packet format encapsulation process, and transfers the transport layer data packet format to the network center.

[0019] Preferably, the mission center receives the space data network protocol transport layer data packet format encapsulation transferred by the network center, performs the data packet format parsing process, performs the application layer data packet format parsing process, extracts the application data field of the data packet, obtains the mission coordination data of the ground station or other satellites for further processing; it receives the satellite mission coordination data generated by this satellite, and the mission center completes the application layer data packet format encapsulation process, completes the transport layer data packet format encapsulation process, and transfers the transport layer data packet format to the network center.

[0020] Preferably, the service center receives the space data network protocol transport layer data packet format encapsulation transmitted by the network center, performs data packet format parsing processing, performs application layer data packet format parsing processing, extracts the data packet application data field, obtains the platform measurement and control data of the ground station or other satellites for further processing; receives the satellite platform measurement and control data generated by the satellite, and the mission center completes the application layer data packet format encapsulation processing, completes the transport layer data packet format encapsulation processing, and transmits the transport layer data packet format to the network center.

[0021] Preferably, two-way data communication is achieved between the satellite data center, mission center, service center, network center, and link center through wired transmission or wireless transmission; when space data is transmitted between the link center and the network center, the bottom layer of the communication protocol is a special protocol defined by the wired transmission method or the wireless transmission method, and the upper layer data domain carries the space data network protocol transmission frame; when space data is transmitted between the network center and the data center, mission center, and service center, the bottom layer of the communication protocol is a special protocol defined by the wired transmission method or the wireless transmission method, and the upper layer data domain carries the space data network protocol transmission layer data packets.

[0022] Preferably, the space data network protocol transmission frame supports the telemetry space data link protocol, the remote control space data link protocol, the advanced on-orbit system space data link protocol, the adjacent space link protocol or the unified space data link protocol; the transmission frame data domain data transmission service supports the multiplexed access byte stream service, the multiplexed access data packet service or the multiplexed access access service; the space link network encapsulation service supports the encapsulation data packet protocol and the IP overCCSDS protocol; the space data network protocol network layer data packet supports the IP data packet protocol; the transport layer data packet supports the transmission control protocol or the user data message protocol; the application layer data packet supports the space data packet protocol.

[0023] Preferably, the network center space data network protocol network layer addressing, if the destination address in the network layer data packet header is the local satellite, then it is transmitted to the local satellite data center, mission center, and service center for processing; if the destination address in the network layer data packet header is another satellite, then it is transmitted to the local satellite link center for further forwarding;

[0024] The data center, mission center, and service center space data network protocol transport layer processing performs retransmission control based on the application data transmission quality requirements carried; the user data message protocol is used preferentially, and the transmission control protocol is used for application data with high reliability transmission quality requirements.

[0025] Preferably, during the network center link layer processing, by multiplexing access to byte stream services, multiplexing access to data packet services, or multiplexing access to access services, the aggregation of data center satellite remote sensing payload data packets, the aggregation of mission collaboration data packets, or the aggregation of platform TT&C data packets is achieved, and the mixed aggregation of remote sensing payload data packets, mission collaboration data packets, and platform TT&C data packets is also achieved; the multiplexing access channels and virtual channels are used to achieve the multiplexing and sharing of the same space link.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The networked collaborative information system from the communication perspective proposed by the present invention breaks the functional positioning and product interface division of traditional satellite electronic information systems, defines the data center, mission center, service center, network center, and link center from the perspective of space data network transmission, reduces resource overhead under the development trend of increasing space communication links, increasing communication protocol complexity, and increasing data interaction frequency, and realizes the intensification of system design;

[0028] (2) The networked collaborative information system from the communication perspective proposed by the present invention breaks the current situation of discrete and specialized designs of traditional satellite space-ground and inter-satellite communication products, plans the processing flow of space data network protocols and corresponding products from the perspective of space data network protocols, and realizes the unified processing of multiple heterogeneous space-ground and inter-satellite links;

[0029] (3) The networked collaborative information system from the communication perspective proposed by the present invention combines the processing and transmission of satellite remote sensing payload data, mission collaboration data, and platform TT&C data, not only meets the different requirements of different types of data processing, but also meets the space transmission requirements of different types of data based on a unified space data network protocol. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes, and advantages of the present invention will become more obvious:

[0031] Figure 1 It is the overall block diagram of the networked collaborative information system from the communication perspective of the present invention;

[0032] Figure 2 It is the schematic diagram of the processing flow of the space data network transmission protocol and the corresponding products of the present invention;

[0033] Figure 3 It is an example of the space network protocol stack of the present invention;

[0034] Figure 4 It is the schematic diagram of the networked collaborative information system after network center addressing and forwarding of the present invention;

[0035] Figure 5 Schematic diagram of the data transmission multiplexing mechanism of the network center of the present invention. Specific implementation manners

[0036] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those of ordinary skill in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0037] Embodiment

[0038] In view of the chimney-style and fragmented function segmentation of satellite electronic information systems, as well as the discrete and specialized status of space-ground and inter-satellite communication products, a networked collaborative information system is proposed from the perspective of space data network transmission, laying a foundation for standardizing on-board information network services and service systems, and meeting the requirements of future space-based information acquisition, transmission, and processing for diverse remote sensing types, complex data processing, and satellite communication networking.

[0039] To achieve the above object, the networked collaborative information system from the communication perspective proposed by the present invention consists of five logical functional domains: a data center, a mission center, a service center, a network center, and a link center to form a satellite information system. In terms of the functional positioning of satellite products, the data center focuses on services on the satellite remote sensing payload side, the mission center focuses on services on the satellite mission planning side, the service center focuses on services on the satellite platform TT&C side, the network center focuses on services on the intra-satellite and inter-satellite network sides, and the link center focuses on services on the inter-satellite and space-ground communication sides.

[0040] Bidirectional data communication is achieved between different satellites through inter-satellite communication links such as microwave and laser, including inter-satellite microwave and laser communication links. Bidirectional data communication is achieved between the satellite and the ground through space-ground communication links such as microwave and laser, including TT&C, data transmission, distribution, and other links. The space data network protocol stack for inter-satellite and space-ground uses a five-layer protocol stack of physical layer, link layer, network layer, transport layer, and application layer.

[0041] Such as Figure 1As shown in the figure, satellite 1 and satellite 2 achieve inter-satellite communication through an inter-satellite communication link. From the perspective of communication, the link center realizes the physical layer processing of inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the link centers between different satellites correspond one by one to complete the same protocol layer processing; the network center realizes the link layer and network layer processing of inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the network centers between different satellites correspond one by one to complete the same protocol layer processing; the data center realizes the transport layer and application layer processing of satellite remote sensing payload data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the data centers between different satellites correspond one by one to complete the same protocol layer processing; the mission center realizes the transport layer and application layer processing of satellite mission collaboration data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the mission centers between different satellites correspond one by one to complete the same protocol layer processing; the service center realizes the transport layer and application layer processing of satellite platform measurement and control data for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the service centers between different satellites correspond one by one to complete the same protocol layer processing.

[0042] Specifically, as Figure 2 shown, in the process of processing the five-layer protocol stack of space data network transmission:

[0043] (1) The link center receives the data sent by the inter-satellite and satellite-ground communication links, extracts the effective signal from the microwave signal or laser signal transmitted through physical channels such as microwave and laser, is responsible for the parsing processing of the physical layer frame format of the space data network protocol, and transfers the encapsulated transport frame format of the space data network protocol to the network center; receives the encapsulated transport frame format of the space data network protocol transferred by the network center, and the link center completes the physical layer frame format encapsulation processing, modulates the information data to physical channels such as microwave and laser, and then transmits it into space;

[0044] (2) The network center receives the encapsulated transport frame format of the space data network protocol transferred by the link center, performs parsing of the transport frame protocol format, parsing of the transport frame data field data transmission service, parsing of the space link network encapsulation service, performs parsing of the network layer data packet format of the space data network protocol and network addressing processing, and transfers the encapsulated transport layer data packet format of the space data network protocol to the data center, mission center, and service center; receives the encapsulated transport layer data packet format of the space data network protocol transferred by the data center, mission center, and service center, and the network center completes the network layer addressing and data packet format encapsulation processing, completes the space link network encapsulation service, transport frame data field data transmission service, and transport frame format encapsulation processing at the link layer, and transfers the transport frame format to the link center;

[0045] (3) The data center receives the encapsulation of the space data network protocol transport layer packet format transmitted by the network center, performs packet format parsing and processing, performs application layer packet format parsing and processing, extracts the application data field of the packet, obtains the remote sensing payload data of other satellites for further processing; receives the satellite remote sensing payload data obtained by this satellite, and the data center completes the application layer packet format encapsulation processing and the transport layer packet format encapsulation processing, and transmits the transport layer packet format to the network center;

[0046] (4) The mission center receives the encapsulation of the space data network protocol transport layer packet format transmitted by the network center, performs packet format parsing and processing, performs application layer packet format parsing and processing, extracts the application data field of the packet, obtains the mission collaboration data of the ground station or other satellites for further processing; receives the satellite mission collaboration data generated by this satellite, and the mission center completes the application layer packet format encapsulation processing and the transport layer packet format encapsulation processing, and transmits the transport layer packet format to the network center;

[0047] (5) The service center receives the encapsulation of the space data network protocol transport layer packet format transmitted by the network center, performs packet format parsing and processing, performs application layer packet format parsing and processing, extracts the application data field of the packet, obtains the platform measurement and control data of the ground station or other satellites for further processing; receives the satellite platform measurement and control data generated by this satellite, and the mission center completes the application layer packet format encapsulation processing and the transport layer packet format encapsulation processing, and transmits the transport layer packet format to the network center.

[0048] As an extension of space network data transmission inside the satellite, two-way data communication is achieved between the data center, mission center, service center, network center, and link center through wired or wireless transmission, and application data can carry space network data. In satellite-borne application scenarios, common wired transmission methods are usually RS422 serial bus, LVDS serial bus, 1553B bus, CAN bus, PCIE bus, Ethernet, and serial RapidIO bus; wireless transmission methods can be BlueTooth, ZigBee, WiFi, RFID, UWB, and LiFi. When space data is transmitted between the link center and the network center, the bottom layer of the communication protocol is a dedicated protocol defined by the wired transmission method or the wireless transmission method, and the upper layer data domain carries the space data network protocol transmission frame; when space data is transmitted between the network center and the data center, mission center, and service center, the bottom layer of the communication protocol is a dedicated protocol defined by the wired transmission method or the wireless transmission method, and the upper layer data domain carries the space data network protocol transmission layer data packet. Taking 1553B as an example, with the support of underlying protocols such as data transmission mechanism, mode instructions, status words, vector words, etc. between the bus controller and the remote terminal defined by the 1553B bus, the bus application data message carries the transmission space network data.

[0049] CCSDS has developed a series of space communication protocols. The space data network protocol transmission frame supports the telemetry space data link protocol CCSDS132.0-B-3 standard, the remote control space data link protocol CCSDS232.0-B-4 standard, the advanced on-orbit system space data link protocol CCSDS 732.0-B-4 standard, the adjacent space link protocol CCSDS211.0-B-6 standard or the unified space data link protocol CCSDS 732.1-B-2 standard. The link center supports the link format processing of the above protocols to meet the access requirements of different links. The space link network encapsulation service supports the encapsulation data packet protocol CCSDS133.1-B-3 standard and the IP over CCSDS protocol CCSDS 702.1-B-1 standard. The network layer data packet of the space data network protocol supports the IP data packet protocol. The transport layer data packet supports the transmission control protocol TCP or the user datagram protocol UDP. The application layer data packet supports the space data packet protocol CCSDS133.0-B-2 standard. Taking the multiplexed access packet encapsulation service to transmit IP packets as an example, a unified space data link protocol is adopted, and the transmission frame contains one or more encapsulated packets, supporting the transmission of packets with multiple different IP addresses. The space network protocol stack of the networked collaborative information system is as follows: Figure 3 shown.

[0050] The IP protocols in the network layer include IPv4 and IPv6 protocols. When forwarding data packets in the network, information such as the IP source address and IP destination address is marked in the IP data packet header, thereby realizing the routing of the IP data packet. For the network layer addressing of the network protocol of the space data network center, if the IP destination address in the network layer data packet header is this satellite, it is transmitted to the data center, mission center, and service center of this satellite for processing. If the IP destination address in the network layer data packet header is another satellite, it is directly transmitted to the link center of this satellite for further forwarding. As Figure 4 shown, Satellite 1 directly forwards data to Satellite 3 via the link center and network center of Satellite 2, avoiding the inter-satellite forwarded data from entering the internal network of the satellite and increasing the data transmission burden and risk of the internal network of the satellite.

[0051] The data center, mission center, and service center perform processing at the transport layer of the space data network protocol and perform retransmission control according to the quality requirements of the application data transmission carried. There are time delays in the bidirectional transmission between the satellite and the ground and between satellites, and the bidirectional bandwidth of the transmission link is unbalanced. The downlink bandwidth (return link) is usually much larger than the uplink bandwidth (forward link). Therefore, the transmission efficiency of using the TCP protocol is relatively low. Moreover, before transmitting the effective data between the satellite and the ground and between satellites, there is usually a synchronization link establishment time to ensure the availability of the channel. At the same time, error control coding is added at the data link layer to improve the error correction and recovery ability of data reception. Therefore, the demand for the TCP retransmission ability is not strong. Usually, satellite remote sensing payload data, satellite platform telemetry data, and most remote control and mission planning data do not require data retransmission and UDP protocol is preferred. However, for special application data with high-reliability transmission quality requirements, such as emergency remote control data related to security, the TCP protocol can be selected.

[0052] The data transmission service in the data field of the transmission frame supports multiplexed access byte stream service, multiplexed access data packet service, or multiplexed access access service. The multiplexed access byte stream service places the IP data packet as a byte stream into the transmission frame and transmits it through the transmission frame in the space data link. The multiplexed access data packet service encapsulates the IP data packet in the service data unit and transmits it in one or more space data link transmission frames. The multiplexed access access service transmits the service data unit with a custom format, byte alignment, and variable length in one or more space data link transmission frames.

[0053] Satellite remote sensing payload data, mission collaboration data, and platform TT&C data can be transmitted through the dedicated space links of the link center respectively, or data can be mixed and aggregated at the network center to share the space links of the link center. Specifically, when processing at the link layer of the network center, as Figure 5As shown, through multiplexed access to byte stream services, multiplexed access to packet services, or multiplexed access to access services, the aggregation of satellite remote sensing payload data packets, the aggregation of mission collaboration data packets, or the aggregation of platform TT&C data packets in the data center can be achieved. The mixed aggregation of remote sensing payload data packets, mission collaboration data packets, and platform TT&C data packets can also be achieved. When multiplexed access to byte stream services is performed, the remote sensing payload data packets, mission collaboration data packets, and platform TT&C data packets can all be used as a type of IP data packet and encapsulated in the transmission frame data field in the form of a byte stream. When multiplexed access to packet services is performed, the remote sensing payload data packets, mission collaboration data packets, and platform TT&C data packets can all be used as a type of IP data packet and encapsulated in the transmission frame data field in the form of an IP data packet. When multiplexed access to access services is performed, the remote sensing payload data packets, mission collaboration data packets, and platform TT&C data packets can all be used as a type of privately defined data packet and encapsulated in the transmission frame data field in the form of a custom data packet.

[0054] Satellite remote sensing payload data, mission collaboration data, and platform TT&C data can achieve multiplexing and sharing of the same space link through multiplexed access channels and virtual channels. On each virtual channel, multiplexed access is provided, enabling service data units from different sources to be multiplexed on the virtual channel. On each physical channel, different types of data can be transmitted through virtual channel multiplexing.

[0055] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0056] Those skilled in the art know that in addition to implementing the systems, devices, and their respective modules provided by the present invention in the form of pure computer-readable program code, the method steps can be logically programmed to enable the systems, devices, and their respective modules provided by the present invention to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc. to achieve the same program. Therefore, the systems, devices, and their respective modules provided by the present invention can be considered as a type of hardware component, and the modules included therein for implementing various programs can also be regarded as the structure within the hardware component; the modules for implementing various functions can also be regarded as either software programs for implementing the method or the structure within the hardware component.

[0057] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A networked collaborative information system from a communication perspective, characterized in that Including: Five major logical functional domains: data center, mission center, service center, network center, and link center; Two-way data communication is achieved between different satellites through microwave and laser inter-satellite communication links, and two-way data communication is achieved between the satellite and the ground through microwave and laser satellite-ground communication links. The space data network protocol stack for inter-satellite and satellite-ground communication adopts a five-layer protocol stack including physical layer, link layer, network layer, transport layer, and application layer; The link center implements physical layer processing for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the link centers between different satellites correspond one-to-one to complete the same protocol layer processing; The network center implements link layer and network layer processing for inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the network centers between different satellites correspond one-to-one to complete the same protocol layer processing; The data center implements transport layer and application layer processing for satellite remote sensing payload data in inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the data centers between different satellites correspond one-to-one to complete the same protocol layer processing; The mission center implements transport layer and application layer processing for satellite mission coordination data in inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the mission centers between different satellites correspond one-to-one to complete the same protocol layer processing; The service center implements transport layer and application layer processing for satellite platform measurement and control data in inter-satellite communication and satellite-ground communication. In the space data network protocol stack, the service centers between different satellites correspond one-to-one to complete the same protocol layer processing.

2. The networked collaborative information system from the perspective of communication according to claim 1, wherein The link center receives the data sent by the inter-satellite and satellite-ground communication links, extracts the effective signals of the microwave and laser physical channels, completes the parsing process of the physical layer frame format of the space data network protocol, and transfers the space data network protocol transport frame format encapsulation to the network center; receives the space data network protocol transport frame format encapsulation transferred by the network center, and the link center completes the physical layer frame format encapsulation process, modulates the information data to the microwave and laser physical channels, and then transmits it into space.

3. The networked collaborative information system from the communication perspective according to claim 1, wherein The network center receives the space data network protocol transport frame format encapsulation transferred by the link center, performs parsing of the transport frame protocol format, parsing of the transport frame data field data transmission service, parsing of the space link network encapsulation service, performs parsing of the space data network protocol network layer packet format and network addressing processing, and transfers the space data network protocol transport layer packet format encapsulation to the data center, mission center, and service center; receives the space data network protocol transport layer packet format encapsulation transferred by the data center, mission center, and service center, and the network center completes network layer addressing and packet format encapsulation processing, completes link layer space link network encapsulation service, transport frame data field data transmission service, and transport frame format encapsulation processing, and transfers the transport frame format to the link center.

4. The networked collaborative information system from the perspective of communication according to claim 1, wherein The data center receives the space data network protocol transport layer data packet format encapsulation transmitted by the network center, performs data packet format parsing and processing, performs application layer data packet format parsing and processing, extracts the data packet application data field, and obtains the remote sensing payload data of other satellites for further processing; receives the satellite remote sensing payload data acquired by this satellite, and the data center completes the application layer data packet format encapsulation and processing, completes the transport layer data packet format encapsulation and processing, and transmits the transport layer data packet format to the network center.

5. The networked collaborative information system from the communication perspective according to claim 1, wherein The mission center receives the space data network protocol transport layer data packet format encapsulation transmitted by the network center, performs data packet format parsing and processing, performs application layer data packet format parsing and processing, extracts the data packet application data field, and obtains the mission coordination data of the ground station or other satellites for further processing; receives the satellite mission coordination data generated by the satellite, and the mission center completes the application layer data packet format encapsulation and processing, completes the transport layer data packet format encapsulation and processing, and transmits the transport layer data packet format to the network center.

6. The networked collaborative information system from the communication perspective according to claim 1, characterized in that, The service center receives the space data network protocol transport layer data packet format encapsulation transmitted by the network center, performs data packet format parsing and processing, performs application layer data packet format parsing and processing, extracts the data packet application data field, and obtains the platform measurement and control data of the ground station or other satellites for further processing; receives the satellite platform measurement and control data generated by the satellite, and the mission center completes the application layer data packet format encapsulation and processing, completes the transport layer data packet format encapsulation and processing, and transmits the transport layer data packet format to the network center.

7. The networked collaborative information system from the perspective of communication according to claim 1, wherein Two-way data communication is achieved between the satellite data center, mission center, service center, network center, and link center through wired or wireless transmission methods; when space data is transmitted between the link center and the network center, the bottom layer of the communication protocol is a special protocol defined by the wired or wireless transmission method, and the upper layer data domain carries space data network protocol transmission frames; when space data is transmitted between the network center and the data center, mission center, and service center, the bottom layer of the communication protocol is a special protocol defined by the wired or wireless transmission method, and the upper layer data domain carries space data network protocol transmission layer data packets.

8. The networked collaborative information system from the communication perspective according to claim 1, wherein The space data network protocol transmission frame supports a telemetry space data link protocol, a telecontrol space data link protocol, an advanced on-orbit system space data link protocol, a neighboring space link protocol or a unified space data link protocol; The transmission frame data domain data transmission service supports multiplexed access byte stream service, multiplexed access data packet service or multiplexed access access service; the space link network encapsulation service supports encapsulation data packet protocol and IP over CCSDS protocol; the space data network protocol network layer data packet supports IP data packet protocol; The transport layer data packet supports the Transmission Control Protocol or the User Datagram Protocol; The application layer data packet supports the space data packet protocol.

9. The networked collaborative information system from the perspective of communication according to claim 1, wherein For the network layer addressing of the network-centric space data network protocol, if the destination address in the network layer data packet header is this satellite, it is transmitted to the data center, mission center, and service center of this satellite for processing; if the destination address in the network layer data packet header is another satellite, it is transmitted to the link center of this satellite for further forwarding. For the transport layer processing of the space data network protocol in the data center, mission center, and service center, retransmission control is performed according to the transmission quality requirements of the carried application data; the User Datagram Protocol is preferably selected, and the Transmission Control Protocol is selected for application data with high reliability transmission quality requirements.

10. The networked collaborative information system from the perspective of communication according to claim 1, characterized in that, During the network center link layer processing, through the multiplexed access byte stream service, multiplexed access data packet service, or multiplexed access access service, the aggregation of satellite remote sensing payload data packets in the data center, the aggregation of mission coordination data packets, or the aggregation of platform measurement and control data packets is realized, as well as the mixed aggregation of remote sensing payload data packets, mission coordination data packets, and platform measurement and control data packets; the multiplexed access channel and virtual channel are used to realize the multiplexing and sharing of the same space link.

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