A communication, navigation and remote sensing integrated satellite, constellation and function linkage method thereof

Abstract

The present invention discloses a satellite integrated with communication, navigation and remote sensing, a constellation and a method for functional linkage thereof, and belongs to the field of satellite technology. The satellite includes a remote sensing payload, a GNSS receiver, a communication payload, a measurement and control transponder, a data transmission unit, an intelligent switching unit, an integrated electronic unit, an atomic clock, a storage unit and an intersatellite transmission device; a plurality of satellites integrated with communication, navigation and remote sensing transmit information through the intersatellite transmission device and form a constellation. The constellation and the ground segment form a space-ground integrated network, including a gateway composed of a data transmission / information gateway station and a mission planning system in the ground segment; an access network composed of communication payloads and communication terminals covered by communication beams, and a core network composed of intelligent switching units and intersatellite transmission equipment; through these structures and methods, the unification of time and space of communication, navigation and remote sensing information transmission, as well as the high linkage and capability enhancement of communication, navigation and remote sensing information are achieved.

Description

Technical Field

[0001] The present invention relates to the field of satellite technology, and in particular to a communication, navigation and remote control integrated satellite, a constellation and a method for function linkage thereof. Background Art

[0002] At present, in order to meet different application requirements, communication satellites, navigation satellites, and remote sensing satellites have all developed rapidly. However, the information transmission channels of communication, navigation, and remote sensing satellites are all independently set up, resulting in the inability to share communication, navigation, and remote sensing information between satellites; and the orbit settings of communication, navigation, and remote sensing satellites are very different, and the phase changes during the operation of each satellite are large, resulting in inconsistent information transmission time for each satellite; in addition, the functions of communication, navigation, and remote sensing satellites are independent and cannot be linked to each other. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides the following technical solutions.

[0004] The first aspect of the present invention provides a communication, navigation and remote sensing integrated satellite, comprising a remote sensing payload, a GNSS receiver, a communication payload, a measurement and control transponder, a data transmission unit, an intelligent switching unit, an integrated electronic unit, an atomic clock, a storage unit and an inter-satellite transmission device;

[0005] Among them, the integrated electronic unit serves as a task management unit, which is used to uniformly schedule the entire task information of the integrated communication, navigation and remote control satellite; the GNSS receiver sends the received information of the navigation satellite to the integrated electronic unit and the inter-satellite transmission equipment through the atomic clock, so as to ensure the unified time base and inter-satellite time of the integrated communication, navigation and remote control satellite; at the same time, the atomic clock is respectively connected to the communication payload and the data transmission unit for two-way communication, so as to ensure the unified time between the communication payload and the communication terminal, and the unified time between the data transmission unit and the data transmission / signal gateway; the integrated electronic unit is respectively connected to the intelligent switching unit, the measurement and control transponder and the inter-satellite transmission equipment for two-way communication; the remote sensing The payload is communicatively connected with the storage unit; the intelligent switching unit is bidirectionally communicatively connected with the storage unit, intersatellite transmission equipment, data transmission unit and communication payload respectively to realize task scheduling and information interaction; the remote sensing payload performs imaging according to the instructions of the integrated electronic unit and stores the imaging data in the storage unit; the communication payload is bidirectionally communicatively connected with the communication terminal of the ground segment to form an uplink and downlink link of the communication service, the measurement and control transponder is bidirectionally communicatively connected with the measurement and control station of the ground segment to form a telemetry and remote control link, and the data transmission unit is bidirectionally communicatively connected with the data transmission / signal gateway station of the ground segment to form an uplink and downlink data link; the integrated communication, navigation and remote control satellite is communicatively connected with other satellites in the constellation through the intersatellite transmission equipment.

[0006] Preferably, the remote sensing payload includes at least one of an optical remote sensing payload and a radar remote sensing payload, and the communication payload includes a multi-beam antenna, a baseband module and a routing module.

[0007] The second aspect of the present invention provides a communication, navigation and remote sensing integrated satellite constellation, including multiple communication, navigation and remote sensing integrated satellites as described in the first aspect, and information is transmitted between each of the communication, navigation and remote sensing integrated satellites through inter-satellite transmission equipment; each of the communication, navigation and remote sensing integrated satellites is distributed on multiple orbital planes, and multiple communication, navigation and remote sensing integrated satellites are evenly distributed on each orbital plane.

[0008] Preferably, 30 orbital planes are evenly arranged at intervals of half an hour from 5:00 to 20:00, and each orbital plane is evenly distributed with more than or equal to 6 of the integrated communication, navigation and remote sensing satellites.

[0009] Preferably, the height of each of the track surfaces is 600-700 km.

[0010] Preferably, each of the integrated communication, navigation and remote sensing satellites is provided with four inter-satellite transmission devices to achieve co-orbit and different-orbit inter-satellite transmission.

[0011] A third aspect of the present invention provides a method for functional linkage of a communication, navigation and remote sensing integrated satellite constellation, using the communication, navigation and remote sensing integrated satellite constellation as described in the second aspect, the method for functional linkage includes:

[0012] The integrated satellite constellation of communication, navigation and remote sensing and the ground segment form a space-ground integrated network, wherein the data transmission / information gateway station and mission planning system of the ground segment constitute a gateway;

[0013] The communication load and the communication terminals covered by the communication beam constitute an access network; the access networks perform routing transmission management of the access networks according to the priority of the communication data; the routing table of the access network is generated by the data transmission / information gateway and communication management is performed;

[0014] The intelligent switching units and inter-satellite transmission equipment between each of the integrated communication, navigation and remote sensing satellites constitute a core network; the core networks perform routing transmission management based on the data priority of communication data, remote sensing data, navigation enhancement data, command data or telemetry data and the path priority between the inter-satellite transmission equipment of the satellite; the routing table of the core network is generated by the mission planning system of the ground segment and performs space-ground information management.

[0015] Preferably, each of the integrated communication, navigation and remote sensing satellites also serves as a relay satellite, and the measurement and control station realizes the remote control and telemetry functions of each satellite in the constellation as well as the command transmission and information linkage between the constellation satellites, so as to improve the inter-satellite communication capability and the remote sensing response speed of each satellite.

[0016] Preferably, the reference time between constellation satellites is used as the ranging input of the satellite, the real-time self-calibration of the remote sensing payload on orbit, and the functional input of the space-based navigation information enhancement, so as to realize the unified space-time reference and precise ranging between satellites, the functional linkage of remote sensing and navigation, the unified space-time reference to enhance the remote sensing position accuracy, the time unification and precise ranging of inter-satellite communication to enhance the navigation accuracy, and the precise orbit determination of navigation to enhance the link establishment and connectivity capabilities of inter-satellite communication.

[0017] Preferably, the navigation enhancement data of the constellation satellite is broadcast to the ground through the multi-beam antenna of the communication payload to realize the navigation positioning of the communication terminal; the fixed communication terminal is used as a navigation reference station, and the uplink reference position information is used as the position reference in the navigation enhancement algorithm to improve the orbit determination function of the constellation satellite and realize the functional linkage of communication and navigation.

[0018] Preferably, the uplink data of the communication terminal is identified for abnormalities in the overhead satellite; telemetry data is generated according to the identification results, and a preset instruction set is triggered; the remote sensing payload performs an instant response to remote sensing imaging through the instruction set, forming a functional linkage between communication and remote sensing, thereby enhancing the ground-to-space communication and improving the remote sensing trigger response capability.

[0019] The beneficial effects of the present invention are as follows: the embodiment of the present invention provides a method for the linkage of communication, navigation and remote sensing integrated satellite, constellation and its functions, wherein the satellite includes a remote sensing payload, a GNSS receiver, a communication payload, a measurement and control transponder, a data transmission unit, an intelligent switching unit, an integrated electronic unit, an atomic clock, a storage unit and an intersatellite transmission device; a plurality of the communication, navigation and remote sensing integrated satellites transmit information through the intersatellite transmission device and form a constellation. The constellation and the ground segment form a space-ground integrated network, including a gateway composed of a data transmission / information gateway station and a mission planning system in the ground segment; an access network composed of the communication payload and the communication terminals covered by the communication beam, and a core network composed of an intelligent switching unit and the intersatellite transmission device; through these structures and methods, the unification of communication, navigation and remote sensing information transmission time and space, as well as the high linkage and capability enhancement of communication, navigation and remote sensing information are achieved. The problems of independent effective information transmission channels for communication, navigation and remote sensing, inconsistent information transmission time, and inability to link functions in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the integrated communication, navigation and remote sensing satellite constellation described in the present invention. DETAILED DESCRIPTION

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1As shown, an embodiment of the present invention provides a communication, navigation and remote sensing integrated satellite, including a remote sensing payload, a GNSS receiver, a communication payload, a measurement and control transponder, a data transmission unit, an intelligent switching unit, an integrated electronic unit, an atomic clock, a storage unit and an inter-satellite transmission device;

[0023] Among them, the integrated electronic unit serves as a task management unit, which is used to uniformly schedule the entire task information of the integrated communication, navigation and remote control satellite; the GNSS receiver sends the received information of the navigation satellite to the integrated electronic unit and the inter-satellite transmission equipment through the atomic clock, so as to ensure the unified time base and inter-satellite time of the integrated communication, navigation and remote control satellite; at the same time, the atomic clock is respectively connected to the communication payload and the data transmission unit for two-way communication, so as to ensure the unified time between the communication payload and the communication terminal, and the unified time between the data transmission unit and the data transmission / signal gateway; the integrated electronic unit is respectively connected to the intelligent switching unit, the measurement and control transponder and the inter-satellite transmission equipment for two-way communication; the remote sensing The payload is communicatively connected with the storage unit; the intelligent switching unit is bidirectionally communicatively connected with the storage unit, intersatellite transmission equipment, data transmission unit and communication payload respectively to realize task scheduling and information interaction; the remote sensing payload performs imaging according to the instructions of the integrated electronic unit and stores the imaging data in the storage unit; the communication payload is bidirectionally communicatively connected with the communication terminal of the ground segment to form an uplink and downlink link of the communication service, the measurement and control transponder is bidirectionally communicatively connected with the measurement and control station of the ground segment to form a telemetry and remote control link, and the data transmission unit is bidirectionally communicatively connected with the data transmission / signal gateway station of the ground segment to form an uplink and downlink data link; the integrated communication, navigation and remote control satellite is communicatively connected with other satellites in the constellation through the intersatellite transmission equipment.

[0024] The remote sensing payload includes one of an optical remote sensing payload and a radar remote sensing payload, and the communication payload includes one of a multi-beam antenna, a baseband module and a routing module.

[0025] An embodiment of the present invention also provides a communication, navigation and remote sensing integrated satellite constellation, including the above-mentioned multiple communication, navigation and remote sensing integrated satellites, and information is transmitted between each of the communication, navigation and remote sensing integrated satellites through inter-satellite transmission equipment; each of the communication, navigation and remote sensing integrated satellites is distributed on multiple orbital planes, and multiple communication, navigation and remote sensing integrated satellites are evenly distributed on each orbital plane.

[0026] Among them, 30 orbital planes are evenly arranged at half-hour intervals from 5:00 to 20:00, and each orbital plane is evenly distributed with more than or equal to 6 said integrated communication, navigation and remote sensing satellites. The altitude of each orbital plane is 600-700km. Each of the said integrated communication, navigation and remote sensing satellites is equipped with four inter-satellite transmission equipment to realize inter-satellite transmission in the same orbit and in different orbits.

[0027] The embodiment of the present invention further provides a method for functional linkage of a communication, navigation and remote control integrated satellite constellation. Using the above-mentioned communication, navigation and remote control integrated satellite constellation, the method for functional linkage includes:

[0028] The integrated satellite constellation of communication, navigation and remote sensing and the ground segment form a space-ground integrated network, wherein the data transmission / information gateway station and mission planning system of the ground segment constitute a gateway;

[0029] The communication terminals covered by the communication load and the communication beam constitute an access network; the access networks manage the routing and transmission of the access networks according to the priority of the communication data. Among them, the communication data can be assigned the priority of the communication data according to the timeliness requirements of the business communication needs, such as real-time voice data has the highest priority, navigation enhanced data transmission timeliness is second, and IoT data collection information timeliness is the last; the routing table of the access network is generated by the data transmission / information gateway and communication management is performed; the intelligent switching units and the inter-satellite transmission equipment between each of the integrated communication, navigation and remote sensing satellites constitute a core network; the core networks manage the routing and transmission of the core network according to the data priority of the communication data, remote sensing data, navigation enhanced data, command data or telemetry data and the path priority between the inter-satellite transmission equipment of the satellite; the routing table of the core network is generated by the mission planning system of the ground segment and the space-ground information management is performed.

[0030] Furthermore, each of the integrated communication, navigation and remote sensing satellites also serves as a relay satellite, and the measurement and control station realizes the remote control and telemetry functions of each satellite in the constellation as well as the command transmission and information linkage between the constellation satellites, so as to improve the inter-satellite communication capability and the remote sensing response speed of each satellite.

[0031] In this method, the reference time between constellation satellites is used as the ranging input between satellites. The accurate and real-time ranging information obtained can realize the real-time self-calibration of remote sensing payloads on orbit and the input of functional parameters for space-based navigation information enhancement, thereby achieving the unification of inter-satellite time and space references and realizing the functional linkage of remote sensing and navigation. The unification of time and space references can enhance the accuracy of remote sensing positions, the time unification and precise ranging of inter-satellite communications can enhance navigation accuracy, and the precise orbit determination of navigation can enhance the link building and connectivity capabilities of inter-satellite communications.

[0032] The navigation enhancement data of the constellation satellite can also be broadcast to the ground through the multi-beam antenna of the communication payload to realize the navigation positioning of the communication terminal; the fixed communication terminal can be used as a navigation reference station, and the uplink reference position information can be used as the position reference in the navigation enhancement algorithm to improve the orbit determination function of the constellation satellite and realize the linkage of communication and navigation functions.

[0033] Furthermore, the uplink data of the communication terminal will be used to identify abnormalities in the overhead satellite; telemetry data will be generated based on the identification results, and a preset instruction set will be triggered; the remote sensing payload will respond to remote sensing imaging instantly through the instruction set, forming a functional linkage between communication and remote sensing, thereby enhancing ground-to-space communications and improving remote sensing trigger response capabilities. Specific embodiments

[0035] like Figure 1 As shown, the satellite constellation provided in the embodiment of the present invention is used as a space segment system, and together with the ground segment system, it constitutes a space-ground information system. The satellite constellation is composed of multiple integrated communication, navigation and remote sensing satellites, such as satellite A, satellite B, satellite C, satellite D, satellite E, etc. The ground segment system can be composed of communication terminals, data transmission / signal gateway stations, measurement and control stations, and mission planning systems.

[0036] In the embodiment of the present invention, the satellite constellation is set based on the sun-synchronous orbit, and an orbital plane is determined at intervals of half an hour. For example, 30 orbital planes can be determined from 5:00 to 20:00, and each orbital plane is evenly distributed with N (N≥6) satellites. The orbital altitude of the satellite constellation can be in the range of 600-700km, which can ensure good optical remote sensing imaging quality while taking into account the wide coverage of the communication beam. The orbital altitude of each satellite is consistent, and the phases of the satellites are stable, ensuring the stability of inter-satellite information transmission.

[0037] In the embodiment of the present invention, the structures of the integrated communication, navigation and telemetry satellites in the constellation are the same. Figure 1 The A satellite structure in . Figure 1 It can be seen that the satellite includes an integrated electronic unit, a measurement and control transponder, an atomic clock, a GNSS receiver, an intelligent switching unit, a storage unit, a data transmission unit, a remote sensing payload, a communication payload, and intersatellite transmission equipment I to IV, etc. The remote sensing payload may include an optical remote sensing payload, a radar remote sensing payload, etc., and the communication payload may include a multi-beam antenna, a baseband module, a routing module, etc.

[0038] Each satellite can be equipped with four intersatellite transmission devices to realize the intersatellite transmission function of the same orbit and different orbits. Remote sensing, communication, and navigation data can be transmitted through the intersatellite link composed of intersatellite transmission equipment, and finally transmitted to the data transmission / signal gateway station of the ground segment system to pass through the satellite and exchange information with the ground. Among them, the satellite's data transmission unit and the ground segment's data transmission / signal gateway station together constitute the uplink and downlink data link function, the measurement and control station and the measurement and control transponder together constitute the telemetry and remote control link function, and the communication payload and the communication terminal together constitute the communication service uplink and downlink function. In order to realize the information interaction between the satellite and the ground segment.

[0039] In the satellite, the GNSS receiver receives the navigation signal from the navigation satellite, generates the PPS second pulse signal and sends it to the atomic clock, which performs time calibration and timekeeping, outputs a stable signal and sends it to the integrated electronic unit, which then outputs the second pulse and sends it to other devices on the satellite to ensure that the time reference between the devices on the satellite is unified. In the embodiment of the present invention, the atomic clock will synchronously provide high-precision time and frequency signals for the integrated electronic unit, intersatellite transmission equipment, communication payload and data transmission unit, which are used for high-precision time unification between communication payload and communication terminal, high-precision time unification between satellites, and high-precision time unification between data transmission unit and signal gateway.

[0040] During use, the satellite's remote sensing payload can perform imaging according to the instructions generated by the integrated electronic unit and store the imaging data in the storage unit. As a task management unit, the integrated electronic unit can uniformly schedule the entire task information. The integrated electronic unit and the measurement and control transponder can perform two-way information exchange. As a data management unit, the intelligent exchange unit has a two-way information interface channel with the storage unit, intersatellite transmission equipment, communication payload, data transmission unit, and integrated electronic unit for task scheduling and information exchange.

[0041] In the constellation, the intelligent switching units and intersatellite transmission equipment between satellites can form a core network, and the communication terminals covered by the communication payload and communication beam can form an access network; the gateway station and the mission planning system in the ground segment can form a gateway, thus forming a space-ground integrated network. Among them, the access network can manage access network routing transmission according to the priority of communication data, and the core network can manage core network routing transmission according to the data priority of communication data, remote sensing data, navigation enhancement data, command data, telemetry data, etc. and the path priority between the intersatellite transmission equipment of the satellite. The access network routing table is generated by the gateway station and communication management is performed, and the core network routing table is generated by the mission planning system and space-ground information management is performed.

[0042] In addition to the business function of responding to its own satellite, each satellite in the constellation also has the function of a relay satellite. The measurement and control station realizes the remote control and telemetry functions of multiple satellites in the constellation, and realizes command transmission and information linkage between constellation satellites. The inter-satellite communication capability can improve the remote sensing response speed.

[0043] The high-precision time unification between constellation satellites can be used as high-precision ranging input between satellites to achieve highly unified time and space references between satellites. It can also be used as real-time self-calibration of satellite remote sensing payloads on orbit, and can also be used as functional input for space-based navigation information enhancement to achieve functional linkage between remote sensing and navigation. High time and space references enhance remote sensing position accuracy, time unification and precise ranging of intersatellite communications enhance navigation accuracy, and navigation precise orbit determination enhances intersatellite communication link building and connectivity capabilities. In addition, navigation enhancement data can be broadcast to the ground through the multi-beam antenna of the communication payload to achieve navigation and positioning of the communication terminal. On the contrary, the uplink reference information can be used as a reference station to improve the satellite orbit determination function and achieve functional linkage between communication and navigation. Moreover, the uplink data of the communication terminal can identify abnormal quantities in the overhead satellite, generate telemetry data, trigger the preset instruction set, and respond to remote sensing imaging immediately, forming a functional linkage between communication and remote sensing. The space-ground communication enhancement can improve the remote sensing trigger response capability.

[0044] The integrated satellite constellation of communication, navigation and remote sensing provided by the embodiment of the present invention has a composition different from that of a general constellation, and the functions of various devices of the satellites in the constellation are different from those of traditional satellites; moreover, the two-layer routing table information of the access network and the core network formed between the satellites of the constellation are independently generated and managed and updated; through the functional linkage of the constellation, the remote sensing on-orbit self-calibration, the functional linkage of navigation enhancement time unification and precise ranging, the spatial-temporal reference to enhance the remote sensing position accuracy, the time unification and precise ranging of inter-satellite communication to enhance the navigation accuracy, and the navigation precise orbit determination to enhance the inter-satellite communication link establishment and interconnection capability are realized; the functional linkage of communication transmission and navigation enhancement information is also realized, and navigation positioning and benchmark calibration are mutually enhanced; as well as the functional linkage of communication transmission and remote sensing imaging instant response, and the space-ground communication enhances the remote sensing trigger response capability;

[0045] Therefore, the integrated satellite constellation of communication, navigation and remote sensing provided by the embodiment of the present invention realizes the unification of communication, navigation and remote sensing information transmission time and space, as well as the high linkage and capability enhancement of communication, navigation and remote sensing information through a unique communication, navigation and remote sensing information transmission network setting. This solves the problems of independent communication, navigation and remote sensing effective information transmission channels, inconsistent information transmission time, and inability to link functions in the prior art.

[0046] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A communication, navigation and remote sensing integrated satellite, characterized in that: It includes a remote sensing payload, a GNSS receiver, a communication payload, a measurement and control transponder, a data transmission unit, an intelligent switching unit, an integrated electronic unit, an atomic clock, a storage unit and an inter-satellite transmission device; wherein the integrated electronic unit serves as a task management unit, and is used to uniformly schedule the entire task information of the integrated communication, navigation and remote control satellite; the GNSS receiver sends the received information of the navigation satellite to the integrated electronic unit and the inter-satellite transmission device through the atomic clock, so as to ensure the unified time base and inter-satellite time of the integrated communication, navigation and remote control satellite; at the same time, the atomic clock is respectively connected to the communication payload and the data transmission unit for two-way communication, so as to ensure the unified time between the communication payload and the communication terminal, and the unified time between the data transmission unit and the data transmission / signal gateway; the integrated electronic unit is respectively connected to the intelligent The exchange unit, the measurement and control transponder and the intersatellite transmission equipment are bidirectionally connected for communication; the remote sensing payload is connected for communication with the storage unit; the intelligent exchange unit is connected for bidirectional communication with the storage unit, the intersatellite transmission equipment, the data transmission unit and the communication payload respectively to realize task scheduling and information interaction; the remote sensing payload performs imaging according to the instructions of the integrated electronic unit and stores the imaging data in the storage unit; the communication payload is connected for bidirectional communication with the communication terminal of the ground segment to form an uplink and downlink link of the communication service, the measurement and control transponder is connected for bidirectional communication with the measurement and control station of the ground segment to form a telemetry and remote control link, the data transmission unit is connected for bidirectional communication with the data transmission / signal gateway station of the ground segment to form an uplink and downlink data link; the integrated communication, navigation and remote control satellite is connected for communication with other satellites in the constellation through the intersatellite transmission equipment.

2. The integrated communication, navigation and remote sensing satellite according to claim 1, characterized in that: The remote sensing payload includes at least one of an optical remote sensing payload and a radar remote sensing payload, and the communication payload includes a multi-beam antenna, a baseband module and a routing module.

3. A satellite constellation integrating communication, navigation and remote sensing, characterized in that: It comprises a plurality of integrated communication, navigation and remote control satellites as described in any one of claims 1-2, and information is transmitted between each of the integrated communication, navigation and remote control satellites via inter-satellite transmission equipment; each of the integrated communication, navigation and remote control satellites is distributed on a plurality of orbital planes, and a plurality of the integrated communication, navigation and remote control satellites are evenly distributed on each orbital plane.

4. The integrated satellite constellation of communication, navigation and telemetry according to claim 3, characterized in that: Thirty orbital planes are evenly arranged at half-hour intervals from 5:00 to 20:00, and each orbital plane is evenly distributed with more than or equal to 6 of the integrated communication, navigation and remote sensing satellites.

5. The integrated satellite constellation of communication, navigation and telemetry according to claim 3, characterized in that: The altitude of each of the orbital surfaces is 600 to 700 km.

6. The integrated satellite constellation of communication, navigation and telemetry according to claim 3, characterized in that: Each of the integrated communication, navigation and remote sensing satellites is provided with four inter-satellite transmission devices to realize inter-satellite transmission in the same orbit or in different orbits.

7. A method for linking functions of integrated satellite constellation for communication, navigation and remote sensing, characterized in that: Applied to the integrated communication, navigation and remote sensing satellite constellation according to any one of claims 3 to 6, the function linkage method comprises: The integrated satellite constellation of communication, navigation and remote sensing and the ground segment form a space-ground integrated network, wherein the data transmission / information gateway station and mission planning system of the ground segment constitute a gateway; The communication load and the communication terminals covered by the communication beam constitute an access network; the access networks perform routing transmission management of the access networks according to the priority of the communication data; the routing table of the access network is generated by the data transmission / information gateway and communication management is performed; The intelligent switching units and inter-satellite transmission equipment between each of the integrated communication, navigation and remote sensing satellites constitute a core network; the core networks perform routing transmission management based on the data priority of communication data, remote sensing data, navigation enhancement data, command data or telemetry data and the path priority between the inter-satellite transmission equipment of the satellite; the routing table of the core network is generated by the mission planning system of the ground segment and performs space-ground information management.

8. The method for linking satellite constellation functions of integrated communication, navigation and remote sensing as claimed in claim 7, characterized in that: Each of the integrated communication, navigation and remote sensing satellites also serves as a relay satellite. The tracking and control station realizes the remote control and telemetry functions of each satellite in the constellation as well as the command transmission and information linkage between the constellation satellites, so as to improve the inter-satellite communication capability and the remote sensing response speed of each satellite.

9. The method for satellite constellation function linkage of integrated communication, navigation and remote sensing as claimed in claim 7, characterized in that: The reference time between constellation satellites is used as the input for satellite ranging, real-time self-calibration of remote sensing payloads on orbit, and functional input for space-based navigation information enhancement, so as to achieve unified inter-satellite time and space reference and precise ranging, functional linkage of remote sensing and navigation, unified time and space reference to enhance remote sensing position accuracy, unified time and precise ranging for inter-satellite communications to enhance navigation accuracy, and precise orbit determination for navigation to enhance inter-satellite communication chain building and connectivity capabilities.

10. The method for satellite constellation function linkage of integrated communication, navigation and remote sensing as claimed in claim 7, characterized in that: The navigation enhancement data of the constellation satellite is broadcast to the ground through the multi-beam antenna of the communication payload to realize the navigation positioning of the communication terminal. The fixed communication terminal is used as a navigation reference station, and the uplink reference position information is used as the position reference in the navigation enhancement algorithm to improve the orbit determination function of the constellation satellite and realize the functional linkage of communication and navigation.

11. The method for linking satellite constellation functions of integrated communication, navigation and remote sensing as claimed in claim 7, characterized in that: The uplink data of the communication terminal is identified for anomalies in the overhead satellite; telemetry data is generated based on the identification results, and a preset instruction set is triggered; the remote sensing payload responds to remote sensing imaging instantly through the instruction set, forming a functional linkage between communication and remote sensing, enhancing ground-to-space communications, and improving remote sensing trigger response capabilities.

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