CN111934748A - Low-orbit satellite inter-satellite link autonomous link establishment method and system based on Beidou short message - Google Patents
Low-orbit satellite inter-satellite link autonomous link establishment method and system based on Beidou short message Download PDFInfo
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Abstract
The invention provides an autonomous link establishing method and system for a low-earth satellite inter-satellite link based on a Beidou short message, wherein the low-earth satellite is matched with satellite-borne navigation equipment with an orbit determination function and satellite-borne Beidou short message equipment, and the satellite-borne Beidou short message equipment sends the real-time position and the orbit information of a satellite, which are calculated by the satellite-borne navigation equipment, to other satellites through the Beidou short message link, so that the other satellites combine to obtain the relative angle of the two satellites through calculation according to the position information of the other satellites and input the relative angle to other inter-satellite antennas with a beam pointing function, and the other satellites point beams to the local satellite to finish the autonomous establishment of the inter-satellite link. After the link is established, the other star can still receive the position and orbit information of the star at all times to realize the dynamic tracking of the beam. By adopting the method, the inter-satellite link of the networking satellite can be automatically established at any time under the condition of meeting the link establishment condition, the inter-satellite link establishment is realized without depending on the orbit parameters of each satellite which are injected in advance on the ground, and the inter-satellite link of the networking satellite is more freely, flexibly and efficiently established.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to an autonomous link establishment method and system for low-orbit satellite inter-satellite links based on Beidou short messages.
Background
With the continuous development of the satellite application field in terms of depth and breadth, it is increasingly difficult to satisfy the realization of complex tasks by only depending on a single satellite. In recent years, the demand of low-orbit multi-satellite cooperative work is continuously increased, and the inter-satellite networking becomes a precondition for realizing multi-satellite cooperation. Aiming at a low-orbit satellite network with a constantly changing relative position, an inter-satellite link cannot be realized by using a fixed pointing antenna, and the problem of low gain and low data transmission rate exists by using a wide beam antenna. Therefore, the low-orbit inter-satellite link often needs to use an antenna with a pointing mechanism or a phased array antenna with variable pointing direction and narrow wave beam, and the antenna needs to have an input of a pointing angle to complete the link establishment.
Patent document CN102201854A discloses a method for establishing a network link of a satellite formation networking, which is a conventional practice at present, and discloses a method for helping each satellite in a network establish an inter-satellite link when the satellite is visible by means of a ground station injecting a "satellite link establishment schedule" in advance, but this requires the ground station to perform a large amount of orbit determination work on each satellite in advance and perform injection operation when each satellite passes by every day, which brings great pressure to the ground station measurement and control resources.
Patent document CN103546211A discloses a space division and time division inter-satellite link fast building method based on space-time prior link building information, which also needs to obtain the relative position between two satellites by means of pre-stored data of ephemeris of each satellite in the network, and the pre-stored ephemeris in the network needs to be regularly annotated by a ground station. The above-mentioned drawbacks also exist.
The invention provides a link establishment solution between low-orbit networking satellites, which is used for guiding the establishment of a high-speed link and is based on the fact that satellite-borne navigation equipment carries out satellite real-time positioning and orbit determination and mutually transmits position and orbit information calculated by the satellite-borne navigation equipment through a low-speed link which can cover the whole world. The Beidou navigation positioning system is provided with a short message communication system, and a user can carry out short message communication with other terminals without applying in advance by using the terminal loaded with the Beidou short message ID card. At present, the Beidou third-generation short message communication system realizes global coverage, and because the Beidou short message is forwarded through a high-orbit satellite in the Beidou navigation system, the low-orbit satellite can also realize the short message communication among the satellites under the condition of being provided with a satellite-borne short message terminal. The position and orbit information data volume of the satellite is small, and the Beidou short message link can be completely utilized for transmission. After the method is adopted, the inter-satellite link establishment of the low-orbit satellite does not need to rely on the measurement of a ground station and the timed upward injection of the orbit parameters of each satellite, and a low-cost and high-efficiency realization condition is created for the autonomous dynamic establishment of the inter-satellite link of the low-orbit satellite network.
Disclosure of Invention
The invention aims to provide an autonomous link establishment method and system for low earth orbit satellite inter-satellite links based on Beidou short messages, namely the autonomous establishment of the low earth orbit satellite inter-satellite links is realized by taking the established Beidou short message links as satellite position and orbit information transmission channels between satellites, the ground intervention is reduced, and the flexible and efficient inter-satellite networking is realized.
According to one aspect of the invention, the invention provides a low earth orbit satellite inter-satellite link autonomous link establishment method based on Beidou short messages, which comprises the following steps:
the method comprises the following steps of local satellite information sending: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
establishing an inter-satellite link: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the dynamic tracking of the satellite comprises the following steps: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing the inter-satellite link: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
Preferably, in the inter-satellite link establishing step, if the link establishment condition is satisfied, the inter-satellite link is established with the intra-network low-orbit satellite satisfying the link establishment condition, that is, the inter-satellite distance is calculated by combining the position and orbit information of the satellite, and if the inter-satellite distance from the intra-network low-orbit satellite to another intra-network low-orbit satellite satisfies the link establishment condition and the inter-satellite distance from another intra-network low-orbit satellite satisfies the link establishment condition, and the inter-satellite communication antenna is started by the satellite and the intra-network low-orbit satellite satisfying the link establishment condition according to the angle information of the other intra-network low-orbit satellite obtained by calculation with respect to the satellite, so that the inter-satellite antenna beams are directed to the other side.
Preferably, in the step of closing the inter-satellite link, the closing of the inter-satellite communication antenna of another satellite of the link establishment when the link establishment condition is not satisfied means that another satellite of the two links establishment completing the inter-satellite link establishment still continuously receives the position and orbit information calculated by the navigation equipment of the opposite party, the current real-time position and angle information of the opposite satellite is obtained through orbit recursion, the continuous dynamic tracking of the beam is realized, and the inter-satellite communication antenna is closed until the relative distance or angle of the other satellite of the two satellites establishment does not satisfy the link establishment condition.
Preferably, each satellite-borne Beidou short message device is provided with a plurality of short message ID cards according to the number of the whole network satellites, if the number of the total satellites in the whole network is N, each satellite-borne short message device of each satellite is provided with N-1 ID cards, when the chain is not established, each ID card sending object used by each satellite-borne short message device of each satellite is set as one fixed satellite in the network, the real-time position and orbit information of the satellite is sent to each satellite in the whole network at least once sending frequency of 60 seconds specified by a short message link protocol, when the two satellites have the chain establishment condition and the need of chain establishment is determined, all the N-1 ID card sending objects of the two satellites are automatically set as the N-1 ID cards of the other satellite, the position orbit information transmission frequency between the two satellites is increased to be N-1 times before the chain establishment, so that the angle calculation data sources for the two satellites to track and maintain are denser, and the calculation precision is improved.
According to another aspect of the invention, an autonomous link establishment system for low earth orbit satellite links based on Beidou short messages is provided, which is characterized by comprising:
this star information sending module: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
an inter-satellite link establishment module: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the satellite dynamic tracking module comprises: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing an inter-satellite link module: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
Preferably, in the inter-satellite link establishing module, if the link establishment condition is satisfied, the inter-satellite link is established with the intra-network low-orbit satellite satisfying the link establishment condition, that is, the inter-satellite distance is calculated by combining the position and orbit information of the satellite, and if the inter-satellite distance from the intra-network low-orbit satellite to another intra-network low-orbit satellite satisfies the link establishment condition and the inter-satellite distance from another intra-network low-orbit satellite satisfies the link establishment condition, and the inter-satellite communication antenna is started by the satellite and the intra-network low-orbit satellite satisfying the link establishment condition according to the angular information of the other intra-network low-orbit satellite obtained by calculation, and the beam of the respective inter-satellite antenna is directed to the other side, thereby completing the.
Preferably, in the module for closing an inter-satellite link, closing the inter-satellite communication antenna of another satellite of the link establishment when the link establishment condition is not satisfied means that the other satellite of the two link establishment that complete the inter-satellite link still continuously receives the position and orbit information calculated by the navigation device of the other party, and obtains the position and angle information of the current real-time satellite of the other party by orbit recursion to realize the continuous dynamic tracking of the beam until the relative distance or angle of the other satellite of the two satellite link establishment does not satisfy the link establishment condition, and closing the inter-satellite communication antenna.
Preferably, each satellite-borne Beidou short message device is provided with a plurality of short message ID cards according to the number of the whole network satellites, if the number of the total satellites in the whole network is N, each satellite-borne short message device of each satellite is provided with N-1 ID cards, when the chain is not established, each ID card sending object used by each satellite-borne short message device of each satellite is set as one fixed satellite in the network, the real-time position and orbit information of the satellite is sent to each satellite in the whole network at least once sending frequency of 60 seconds specified by a short message link protocol, when the two satellites have the chain establishment condition and the need of chain establishment is determined, all the N-1 ID card sending objects of the two satellites are automatically set as the N-1 ID cards of the other satellite, the position orbit information transmission frequency between the two satellites is increased to be N-1 times before the chain establishment, so that the angle calculation data sources for the two satellites to track and maintain are denser, and the calculation precision is improved.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the position and orbit information of each satellite in the network is transmitted to the Beidou short message link, so that the autonomous link establishment of the links among the networking satellites is realized, the participation of a ground station in the satellite networking is reduced, and the flexibility, reliability and efficiency of the link establishment of the networking satellites are improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of a design method of the present invention;
FIG. 2 is a diagram of the link transmission relationship between satellites of the networking satellite when no link is established in the present invention;
fig. 3 is a diagram of the link transmission relationship between networking satellites after the link is established in the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, the present invention provides an autonomous link establishment method for a low earth orbit satellite inter-satellite link based on a beidou short message, and more specifically, the method includes:
the method comprises the following steps of local satellite information sending: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
establishing an inter-satellite link: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the dynamic tracking of the satellite comprises the following steps: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing the inter-satellite link: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
In the inter-satellite link establishing step, if the inter-satellite link establishing condition is met, the inter-satellite link establishing with the intra-network low-orbit satellite meeting the link establishing condition is completed, namely the inter-satellite distance is calculated by combining the position and the orbit information of the satellite, and if the inter-satellite distance with the intra-network low-orbit satellite meeting the link establishing condition is met, and the inter-satellite communication antenna is started by the satellite and the intra-network low-orbit satellite meeting the link establishing condition when the inter-satellite communication antenna beam and the intra-network low-orbit satellite meeting the link establishing condition also meet the link establishing condition according to the angle information of the intra-network low-orbit satellite relative to the satellite obtained by calculation, so that the inter-satellite antenna beam points to the opposite.
In the step of closing the inter-satellite link, the inter-satellite communication antenna of the other satellite of the link establishment is closed when the link establishment condition is not met, namely the other satellite of the two links of the link establishment which completes the inter-satellite link still continuously receives the position and track information calculated by the navigation equipment of the opposite side, the position and angle information of the current real-time opposite side satellite is obtained through track recursion, the continuous dynamic tracking of the wave beam is realized, and the inter-satellite communication antenna is closed until the relative distance or angle of the other satellites of the two links of the link establishment does not meet the link establishment condition.
Each satellite-borne Beidou short message device is provided with a plurality of short message ID cards according to the number of satellites in the whole network, if the number of the total satellites in the whole network is N, each satellite-borne short message device of each satellite is provided with N-1 ID cards, when the link is not established, each ID card sending object used by the satellite-borne short message device of each satellite is set as one fixed satellite in the network, the real-time position and orbit information of the satellite is sent to each satellite in the whole network at the sending frequency of at least 60 seconds specified by a short message link protocol, when the two satellites have the link establishment condition and the link needs to be established, all the N-1 ID card sending objects of the two satellites are automatically set as N-1 ID cards of the other satellite, the position orbit information transmission frequency between the two satellites is increased to be N-1 times before the link establishment, so that the angle calculation data source for the two satellites to track and maintain is denser, and the calculation precision is improved.
In this embodiment, there are A, B, C, D four-satellite networks, as shown in fig. 2, each satellite is matched with a satellite-borne navigation device and a satellite-borne Beidou short message transceiver device, each Beidou short message transceiver device is equipped with three Beidou short message ID cards, each ID card is fixed as a fixed ID card of another fixed satellite in the network by default, if a card with an a satellite ID of a1 is fixed, short message communication is performed with a card with a B satellite ID of B1, and the communication frequency is set according to the minimum specified frequency of a short message link. Therefore, the position and orbit information of the satellite is acquired by other satellites in the network at the frequency specified by the Beidou short message link protocol.
As shown in fig. 3, each satellite settles the relative distance and angle between itself and each satellite in real time according to the position and orbit information sent by its satellite, taking A, B satellites as an example, when the relative distance and angle between two satellites solved by A, B satellites meet the requirement of establishing an inter-satellite data transmission link, the two satellites start the inter-satellite communication antenna, and input the calculated relative pointing angle to the inter-satellite communication antenna, and the inter-satellite communication antenna points the beam to the opposite satellite according to the pointing angle, thereby realizing the establishment of A, B inter-satellite data transmission link.
After the inter-satellite data transmission link is established, the two satellites can transmit the state identification of successful link establishment to the satellite-borne Beidou short message equipment of each satellite, the two-satellite Beidou short message equipment temporarily modifies the transmission objects of the ID cards into opposite satellites, and sequentially uses the ID cards to transmit the real-time position and the track information of the satellite to the opposite satellites at the interval of 1/4 time of the original interval (such as 60s), so that the transmission frequency of the track information of the position of the two satellites is improved, and the precision of resolving the azimuth angle of the satellite of the opposite satellite by the two satellites is improved.
And after the inter-satellite data transmission link is disconnected, the sending object of each ID card of the satellite-borne Beidou short message equipment is recovered to a default value.
The invention provides a low earth orbit satellite link autonomous link establishment system based on Beidou short messages, which comprises the following modules:
this star information sending module: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
an inter-satellite link establishment module: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the satellite dynamic tracking module comprises: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing an inter-satellite link module: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
In the inter-satellite link establishing module, if the inter-satellite link establishing module meets the link establishing condition, the inter-satellite link establishing module completes the inter-satellite link establishment with the intra-network low-orbit satellite meeting the link establishing condition, namely the inter-satellite distance is calculated by combining the position and the orbit information of the satellite, if the inter-satellite distance with the intra-network low-orbit satellite meets the link establishing condition, and the inter-satellite communication antenna is started by the satellite and the intra-network low-orbit satellite meeting the link establishing condition when the inter-satellite distance with the intra-network low-orbit satellite meeting the link establishing condition and the angle information of the other intra-network low-orbit satellite obtained by calculation relative to the satellite also meet the link establishing condition, and the inter-satellite antenna beams are.
In the module for closing the inter-satellite link, closing the inter-satellite communication antenna of the other satellite of the link establishment when the link establishment condition is not satisfied means that the other satellite of the two links of the link establishment which completes the inter-satellite link still continuously receives the position and track information resolved by the navigation equipment of the opposite side, and the position and angle information of the current real-time opposite side satellite is obtained through track recursion, so that the continuous dynamic tracking of the wave beam is realized, and the inter-satellite communication antenna is closed until the relative distance or angle of the other satellites of the two links of the link establishment does not satisfy the link establishment condition.
Each satellite-borne Beidou short message device is provided with a plurality of short message ID cards according to the number of satellites in the whole network, if the number of the total satellites in the whole network is N, each satellite-borne short message device of each satellite is provided with N-1 ID cards, when the link is not established, each ID card sending object used by the satellite-borne short message device of each satellite is set as one fixed satellite in the network, the real-time position and orbit information of the satellite is sent to each satellite in the whole network at the sending frequency of at least 60 seconds specified by a short message link protocol, when the two satellites have the link establishment condition and the link needs to be established, all the N-1 ID card sending objects of the two satellites are automatically set as N-1 ID cards of the other satellite, the position orbit information transmission frequency between the two satellites is increased to be N-1 times before the link establishment, so that the angle calculation data source for the two satellites to track and maintain is denser, and the calculation precision is improved.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. A low orbit satellite inter-satellite link autonomous link establishment method based on Beidou short messages is characterized by comprising the following steps:
the method comprises the following steps of local satellite information sending: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
establishing an inter-satellite link: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the dynamic tracking of the satellite comprises the following steps: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing the inter-satellite link: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
2. The autonomous inter-satellite link establishment method based on the beidou short message according to claim 1, wherein in the inter-satellite link establishment step, if the link establishment condition is satisfied, the inter-satellite link establishment with the intra-network low-orbit satellite satisfying the link establishment condition is completed by resolving the inter-satellite distance by combining the position of the satellite and the orbit information, and if the inter-satellite distance with the other intra-network low-orbit satellite satisfies the link establishment condition and the inter-satellite distance with the other intra-network low-orbit satellite obtained by the resolution also satisfies the link establishment condition with respect to the satellite angle information, the satellite and the intra-network low-orbit satellite satisfying the link establishment condition both start inter-satellite communication antennas and direct the respective inter-satellite antenna beams to the other side, thereby completing the inter-satellite link establishment.
3. The autonomous inter-satellite link establishment method based on the beidou short message for the low earth orbit satellite according to claim 1, wherein in the step of closing the inter-satellite link, the inter-satellite communication antenna of the other satellite of the link establishment is closed when the link establishment condition is not satisfied, which means that the other satellite of the two links establishment completing the inter-satellite link establishment still continuously receives the position and orbit information solved by the navigation equipment of the other party, the position and angle information of the current real-time other satellite is obtained through orbit recursion, and the continuous dynamic tracking of the beam is realized until the inter-satellite communication antenna is closed when the relative distance or angle between the other satellites of the two satellites of the link establishment does not satisfy the link establishment condition.
4. The autonomous building method of the links between the satellites of the low earth orbit satellite based on the Beidou short message according to any one of claims 1 to 3, wherein each satellite-borne Beidou short message device is provided with a plurality of short message ID cards according to the number of the satellites in the whole network, if the number of the satellites in the whole network is N, the satellite-borne short message device of each satellite is provided with N-1 ID cards, when the links are not built, each ID card transmitting object used by the satellite-borne short message device of each satellite is set as one fixed satellite in the network, the real-time position and orbit information of the satellite is transmitted to each satellite in the whole network at a transmitting frequency of at least 60 seconds specified by a short message link protocol, when two satellites have the link building condition and the links need to be built, all the transmitting objects of the N-1 ID cards of the two satellites are automatically set as the N-1 ID cards of the other satellite, so that the transmitting frequency of the orbit information between the two satellites is increased to N-1 times before the link building, therefore, the angle calculation data source for the two stars for link tracking and maintaining is more intensive, and the calculation accuracy is improved.
5. The utility model provides a low orbit satellite inter-satellite link is system of independently establishing a chain based on big dipper short message which characterized in that includes:
this star information sending module: the low-orbit satellites of each network set send the real-time position and the orbit information of the satellite calculated by the satellite-borne navigation equipment to the low-orbit satellites in other networks through the Beidou short message link in real time through the satellite-borne short message transceiver;
an inter-satellite link establishment module: after the low-orbit satellites of each networking continuously receive Beidou short message information which is sent by low-orbit satellites in other networks and contains real-time positions and orbit information of the low-orbit satellites in other networks through satellite-borne short message receiving and sending equipment, if a link building condition is met, the low-orbit satellites in the networks and the low-orbit satellites in the networks meeting the link building condition complete the building of inter-satellite links, and the low-orbit satellites in the networks which complete the building of the inter-satellite links are other satellites in the link building;
the satellite dynamic tracking module comprises: the low-orbit satellite of each network after building the chain continuously receives the position and the orbit information of other stars of the building chain, and according to the position and the orbit information of other stars of the building chain received, solve the relative position of other stars of the building chain relative to the present star in real time, continuously update the pointing angle of the inter-satellite antenna, make the inter-satellite antenna point and realize the continuous dynamic tracking of other stars of the building chain;
and closing an inter-satellite link module: and when the link establishment condition is not met, the inter-satellite communication antenna of the other satellite of the link establishment is closed, and when the link establishment is finished.
6. The autonomous inter-satellite link establishment system based on the beidou short message according to claim 5, wherein in the inter-satellite link establishment module, if the link establishment condition is satisfied, the inter-satellite link establishment with the intra-network low-orbit satellite satisfying the link establishment condition is completed by resolving the inter-satellite distance by combining the position of the satellite and the orbit information, and if the inter-satellite distance with the other intra-network low-orbit satellite satisfies the link establishment condition and the inter-satellite distance with the other intra-network low-orbit satellite obtained by the resolving also satisfies the link establishment condition with respect to the satellite angle information, the satellite and the intra-network low-orbit satellite satisfying the link establishment condition both start inter-satellite communication antennas and direct the respective inter-satellite antenna beams to each other to complete the inter-satellite link establishment.
7. The autonomous inter-satellite link establishment system based on the beidou short message low earth orbit satellite according to claim 5, wherein in the inter-satellite link establishment closing module, the inter-satellite communication antenna of the other satellite of the link establishment is closed when the link establishment condition is not satisfied, which means that the other satellite of the two links establishment completing the inter-satellite link establishment still continuously receives the position and orbit information solved by the navigation equipment of the other party, the position and angle information of the current real-time other satellite is obtained through orbit recursion, and the continuous dynamic tracking of the beam is realized until the relative distance or angle between the other satellites of the two links establishment does not satisfy the link establishment condition, and the inter-satellite communication antenna is closed.
8. The autonomous building system of the low earth orbit satellite link based on the beidou short message according to any one of claims 5 to 7, characterized in that each satellite-borne beidou short message device is equipped with a plurality of short message ID cards according to the number of the whole network satellites, if the number of the whole network satellites is N, then each satellite-borne short message device of each satellite is equipped with N-1 ID cards, when the link is not built, each ID card transmitting object used by each satellite-borne short message device of each satellite is set as one other fixed satellite in the network, the transmitting frequency of at least 60 seconds specified by the short message link protocol is used for transmitting the real-time position and orbit information of the satellite to each satellite in the whole network, when two satellites have the link building condition and the need of link building is determined, all the N-1 ID card transmitting objects of the two satellites are automatically set as the N-1 ID card of the other satellite, so that the transmitting frequency of the position orbit information between the two satellites is increased to N-1 times before the link building, therefore, the angle calculation data source for the two stars for link tracking and maintaining is more intensive, and the calculation accuracy is improved.
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