CN111585638B - Inter-satellite network communication method, communication satellite and system - Google Patents
Inter-satellite network communication method, communication satellite and system Download PDFInfo
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- CN111585638B CN111585638B CN202010319685.1A CN202010319685A CN111585638B CN 111585638 B CN111585638 B CN 111585638B CN 202010319685 A CN202010319685 A CN 202010319685A CN 111585638 B CN111585638 B CN 111585638B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18558—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
Abstract
The embodiment of the invention discloses an inter-satellite network communication method, a communication satellite and a system, and belongs to the technical field of satellite communication. The inter-satellite network communication method comprises the following steps: the method comprises the steps of receiving an information sending request, finding each node for establishing a communication link through a three-time sorting method, sequentially sending target coordinate information and node broadcast information to a next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing the communication link with a target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, sending the target response feedback to a sending end so as to establish a dynamic communication link from the sending end to the target, and transmitting the information of the sending end to the terminal node through the established dynamic communication link so as to enable the terminal node to send the information to the target. The invention can realize the on-orbit autonomous management of the satellite constellation, the on-orbit rapid reconstruction and the high-efficiency operation dynamic routing method.
Description
Technical Field
The invention relates to the technical field of communication satellites, in particular to an inter-satellite network communication method, a communication satellite and a system.
Background
The demand for satellite communications has increased in recent years. Compared with a synchronous orbit communication satellite, the low orbit communication satellite has the advantages of small communication delay and convenience for miniaturization of the terminal. However, to achieve the performance of low earth orbit communication satellites, global networking of the satellites must be implemented to ensure real-time and uninterrupted communication coverage on the ground. This situation has led to the development of inter-satellite link technology.
One key technology in the inter-satellite link technology is the inter-satellite link routing technology. The current developed relatively mature inter-satellite link routing technology is static routing technology. Taking an iridium satellite as an example, 66 satellites are distributed on 6 orbital planes, and each iridium satellite has four inter-satellite links, wherein two inter-satellite links are used for communication with front and back adjacent satellites in the same orbital plane, and the other two inter-satellite links are used for communication with adjacent satellites on left and right adjacent orbital planes. The network topology structure of the static routing technology is relatively simple, and the network relationship between the communication nodes is relatively fixed, but the disadvantages are also quite obvious: communication links can be established between all nodes of the satellite network by adopting a static routing method only in a fixed mode, communication congestion of some nodes can be caused in a communication hot spot area, and the communication efficiency of the network is reduced because some nodes are idle for a long time. In addition, when a node in the network is abnormal, the routing line adopting the node cannot be used, the reconstruction cannot be realized quickly, a new routing table needs to be allocated to the node in each network again, and the efficiency of the network node is low. In addition, the satellite constellation operation using the static routing method needs to depend on the support and management of global multi-ground stations, and the on-orbit autonomous management of the constellation cannot be realized.
Disclosure of Invention
The invention provides an inter-satellite network communication method, a communication satellite and a system, which can realize the on-orbit autonomous management of a satellite constellation, the on-orbit rapid reconstruction and the high-efficiency dynamic routing method.
The technical scheme is as follows:
the embodiment of the invention provides an inter-satellite network communication method, which comprises the following steps:
s1: receiving an information sending request of a sending end, wherein the sending end sends the information sending request and sends target information to a satellite node of a current sending end service area, the satellite node of the current sending end service area is an initial satellite, and the target information comprises at least one of identity and position information of a target;
s2: analyzing and calculating to obtain communicable time with surrounding satellite nodes according to received surrounding satellite node broadcast information, and performing first selection and sequencing on the surrounding satellite nodes according to the communicable time, wherein each satellite node in a satellite network transmits satellite node broadcast information to the surroundings in a broadcast mode, the satellite node broadcast information comprises at least one of speed, direction and link state of a satellite, and the surrounding satellite is a satellite in a communicable range of a starting satellite;
s3: according to the target information in the information sending request, determining surrounding satellite nodes in the target coordinate direction, and performing second selection and sequencing on the surrounding satellite nodes subjected to the first sequencing according to the relation between the surrounding satellite nodes and the target coordinate direction;
s4: according to the distance between the peripheral satellite nodes after the second selection and sorting and the target coordinates, performing third selection and sorting on the peripheral satellite nodes after the second sorting, and taking the peripheral satellite nodes which are sorted for the first time after the third sorting as next sending nodes;
s5: inquiring a next transmitting node in a broadcasting mode, confirming whether a link can be established, and if so, taking the next transmitting node as a new initial satellite, wherein the new initial satellite carries out steps S2-S5, and the next transmitting node of the new initial satellite is searched and selected in sequence until a terminal node which can establish a communication link with a target is found;
s6: sequentially sending the target coordinate information and the node broadcast information to the next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with a target so that the terminal node can be contacted with the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, and sending the target response feedback to a sending end so as to establish a dynamic communication link from the sending end to the target;
s7: and transmitting the information of the transmitting end to the terminal node through the established dynamic communication link so that the terminal node sends the information to the target.
In a preferred embodiment of the present invention, the step S5 of determining whether the link can be established further includes:
and if the link can not be established, sequentially selecting the surrounding satellite nodes as the next sending node according to the sequence after the third sorting.
In a preferred embodiment of the present invention, step S2 specifically includes:
calculating the communicable time and relative position relation between the initial satellite and the surrounding satellite nodes according to the received surrounding satellite node broadcast information;
and selecting surrounding satellite nodes with communicable time larger than the threshold time, and sequencing the surrounding satellite nodes with communicable time larger than the threshold time for the first time from long to short.
In a preferred embodiment of the present invention, step S3 specifically includes:
and selecting surrounding satellite nodes of the space orientation in the target coordinate direction from the surrounding satellite nodes after the first sequencing, and performing second sequencing on the surrounding satellite nodes of the space orientation in the target coordinate direction.
In a preferred embodiment of the present invention, the third selecting and sorting of the surrounding satellite nodes sorted for the second time in step S4 specifically includes:
and carrying out third selection on the surrounding satellite nodes after the second sorting and sorting according to the principle of near to far according to the distance.
In a preferred embodiment of the present invention, the step S7 of transmitting the originating information to the terminating node through the established dynamic communication link specifically includes: and transmitting the information of the transmitting end and the priority of the important information to the terminal node through the established dynamic communication link, so that the satellite node on the dynamic communication link transmits the information of the transmitting end according to the priority of the important information.
In a preferred embodiment of the present invention, step S5 further includes:
and if the node which can establish the communication link with the target cannot be found, outputting network busy information.
In a preferred embodiment of the present invention, the step S5 of determining whether the link can be established further includes:
and if the link can be established but the transmission data volume cannot meet the requirement, reducing the sending rate of the data packet in the transmitting-end information.
An embodiment of the present invention provides a communication satellite, including: a request module, a first ordering module, a second ordering module, a third ordering module, a node determination module in a communication link, a communication link establishment module and an information sending module, wherein,
the request module is used for receiving an information sending request of a sending end, wherein the sending end sends the information sending request and sends target information to a satellite node of a current sending end service area, the satellite node of the current sending end service area is a starting satellite, and the target information comprises at least one of identity and position information of a target;
the satellite network comprises a first sequencing module, a second sequencing module and a third sequencing module, wherein the first sequencing module is used for analyzing and calculating the communicable time with surrounding satellite nodes according to received surrounding satellite node broadcast information, and performing first selection and sequencing on the surrounding satellite nodes according to the communicable time, each satellite node in the satellite network transmits satellite node broadcast information to the surroundings in a broadcast mode, the satellite node broadcast information comprises at least one of the speed, the direction and the link state of a satellite, and the surrounding satellite is a satellite in a communicable range of a starting satellite;
the second sorting module is used for determining surrounding satellite nodes in the target coordinate direction according to the target information in the information sending request, and performing second selection and sorting on the surrounding satellite nodes subjected to the first sorting according to the relation between the surrounding satellite nodes and the target coordinate direction;
the third sorting module is used for carrying out third selection and sorting on the peripheral satellite nodes sorted for the second time according to the distances between the peripheral satellite nodes sorted for the second time and the target coordinates, and taking the peripheral satellite nodes sorted for the first time after the third sorting as next sending nodes;
the communication link node determining module is used for inquiring the next sending node in a broadcasting mode to determine whether the link can be established or not, and if the link can be established, the next sending node is used as a new initial satellite, wherein the new initial satellite performs the functions of the first sequencing module, the second sequencing module, the third sequencing module and the communication link node determining module, and the next sending node of the new initial satellite is searched and selected in sequence until a terminal node capable of establishing the communication link with the target is found;
the communication link establishing module is used for sequentially sending the target coordinate information and the node broadcast information to the next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with the target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, and sending the target response feedback to the sending end so as to establish a dynamic communication link from the sending end to the target;
and the information sending module is used for transmitting the information of the transmitting end to the terminal node through the established dynamic communication link so that the terminal node sends the information to the target.
In a preferred embodiment of the present invention, the first sequencing module is specifically configured to calculate a communicable time and a relative position relationship between the starting satellite and the surrounding satellite nodes according to the received surrounding satellite node broadcast information; and selecting surrounding satellite nodes with communicable time larger than the threshold time, and sequencing the surrounding satellite nodes with communicable time larger than the threshold time for the first time from long to short.
In a preferred embodiment of the present invention, the second sorting module is specifically configured to select surrounding satellite nodes with a spatial orientation in the target coordinate direction from the surrounding satellite nodes after the first sorting, and perform the second sorting on the surrounding satellite nodes with an orientation in the target coordinate direction.
In a preferred embodiment of the present invention, the third sorting module is specifically configured to perform a third selection on the surrounding satellite nodes sorted for the second time and sort the satellite nodes according to the distance from near to far.
In a preferred embodiment of the present invention, the information sending module is further configured to transmit the information of the origination and the priority of the important information to the terminating node through the established dynamic communication link, so that the satellite node on the dynamic communication link transmits the information of the origination according to the priority of the important information.
In a preferred embodiment of the present invention, the node determining module in the communication link is further configured to output network busy information if a node capable of establishing a communication link with the target cannot be found; and if the link can be established but the transmission data volume cannot meet the requirement, reducing the sending rate of the data packet in the transmitting-end information.
The embodiment of the invention provides an inter-satellite network communication system, which comprises: the communication satellite comprises an initial satellite for initiating communication and a plurality of surrounding satellite nodes, each communication satellite comprises a request module, a first sequencing module, a second sequencing module, a third sequencing module, a node determination module in a communication link, a communication link establishment module and an information sending module, wherein the communication link establishment module of the initial satellite is used for pointing to a next satellite node by adjusting an antenna beam so as to send target coordinate information and node broadcast information to the next sending node until a previous satellite node of a satellite terminal node points to a terminal node capable of establishing a communication link with a target by adjusting the antenna beam so as to finish transmitting the target coordinate information and the node broadcast information from the initial satellite to the terminal node.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by receiving an information sending request, finding each node for establishing a communication link by a three-time sorting method, sequentially sending target coordinate information and node broadcast information to a next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with a target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, sending the target response feedback to a sending end so as to establish a dynamic communication link from the sending end to the target, transmitting the information of the sending end to the terminal node through the established dynamic communication link so as to enable the terminal node to send the information to the target, compared with a satellite network adopting a static routing method which needs to establish more stations worldwide for on-orbit management, the inter-satellite network adopting the dynamic routing method of the invention does not determine the inter-satellite link connection relationship through a fixed routing table any more, the on-orbit autonomous management capability of the satellite network is improved, the dependence of satellite constellation management on ground stations is reduced, and the operation cost of the satellite constellation is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a flowchart illustrating steps of a method for inter-satellite network communication according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the starting satellite and surrounding satellite nodes of FIG. 1;
fig. 3 is a main block diagram of a communication satellite according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the inter-satellite network communication method, the communication satellite and the system according to the present invention will be made with reference to the accompanying drawings and the preferred embodiments.
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings. While the present invention has been described in connection with the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and specific embodiments thereof.
First embodiment
Fig. 1 is a flowchart illustrating steps of a method for inter-satellite network communication according to a first embodiment of the present invention. Fig. 2 is a schematic diagram of the starting satellite and surrounding satellite nodes of fig. 1. The method can realize the on-orbit autonomous management of the satellite constellation, the on-orbit rapid reconstruction and the high-efficiency operation dynamic routing method, and the method can be executed by the initial satellite initiating communication. Referring to fig. 1 and 2, the inter-satellite network communication method of the present embodiment may include the following steps S1-S7.
Step S1, receiving an information sending request from a sending end, where the sending end sends the information sending request and sends target information to a satellite node in a current sending end service area, the satellite node in the current sending end service area is a starting satellite, and the target information includes at least one of an identity and position information of the target.
The originating terminal may be any information transmission device that needs to transmit information via a satellite, such as the ground or the air, and the originating satellite 1 (shown in fig. 2) is the satellite that initiates the communication.
And step S2, according to the received broadcast information of the surrounding satellite nodes, analyzing and calculating to obtain the communicable time with the surrounding satellite nodes, and performing first selection and sequencing on the surrounding satellite nodes according to the communicable time.
Each satellite node in the satellite network transmits satellite node broadcast information to the surroundings in real time in a broadcast manner, so that an initial satellite receiving an information transmission request can receive the broadcast information transmitted by the surrounding satellite nodes, if the broadcast information transmitted by the surrounding satellite nodes 2, 3, 4, 5, 6, 7, 8 (shown in fig. 2) is received, it indicates that the surrounding satellite nodes 2, 3, 4, 5, 6, 7, 8 are within a communicable range of the initial satellite 1 initiating communication, the satellite node broadcast information can include at least one of the speed, the azimuth, and the link state of the satellite, the azimuth includes a direction and a position, the link state can include a motion state, and the surrounding satellite is a satellite within the communicable range of the initial satellite. The broadcast information may include call information and response information, and the response information may include spatial coordinate information of the satellite node, orbit information of the satellite node, timing information of the satellite node, and the like. According to the broadcast information, the initial satellite initiating communication can know the position, the motion state and the like of the surrounding satellite nodes at any time. The communication-capable time and relative position relation between the initial satellite initiating communication and surrounding satellite nodes can be calculated by the initial satellite initiating communication according to the positions and motion states of the surrounding satellite nodes, the surrounding satellite nodes with the communication-capable time larger than a threshold time (for example, 2 minutes) are selected, and the surrounding satellite nodes with the communication-capable time larger than the threshold time are sorted for the first time according to the principle that the communication-capable time is from long to short, because the satellite moves in real time, the first sorting is dynamic. In step S2, satellite nodes that can be used to establish a link are established with a certain communication-capable time length as a threshold value, and sorted according to the principle that the communication-capable time is from long to short, so that satellite nodes whose communication-capable time is short and whose communication-capable range is to be switched can be excluded.
Preferably, step S2 may specifically include: calculating the communicable time and relative position relation between the initial satellite and the surrounding satellite nodes according to the received surrounding satellite node broadcast information;
wherein, for example, as shown in fig. 2, the originating satellite 1 initiating the communication broadcasts information according to surrounding satellite nodes 2, 3, 4, 5, 6, 7; selecting surrounding satellite nodes with communication time longer than threshold time, performing first selection and sorting on the surrounding satellite nodes with the communication time longer than the threshold length according to the principle that the communication time is from long to short, screening out surrounding satellite nodes 2, 3, 4, 5 and 6 through the first selection, and sorting the surrounding satellite nodes 2, 3, 4, 5 and 6 according to the principle that the communication time is from long to short.
And step S3, according to the target information in the information sending request, determining surrounding satellite nodes in the target coordinate direction, performing second selection on the surrounding satellite nodes after the first sorting, and sorting according to the relation between the surrounding satellite nodes and the target coordinate direction.
The target (e.g., the target receiving end in fig. 2), that is, the destination of information transmission, may be, for example, a target device located on the ground or in the air, and the target information, that is, destination information to which the start satellite initiating communication is to transmit information, for example, target coordinates, a target coordinate direction, and the like.
Preferably, step S3 may specifically include: and selecting surrounding satellite nodes of the space orientation in the target coordinate direction from the surrounding satellite nodes after the first sequencing, and performing second sequencing on the surrounding satellite nodes of the space orientation in the target coordinate direction. The initial satellite initiating communication can determine which satellite nodes in the communicable range are in the target coordinate direction according to the target information, determine satellite nodes in the target coordinate direction capable of performing the next information transmission, that is, preferentially select surrounding satellite nodes in the target coordinate direction on the basis of step S2, for example, screen out surrounding satellite nodes 2, 4, 5, and 6 by second selection, and the screened surrounding satellite nodes are unchanged according to the sorting in step S2.
And step S4, according to the distance between the surrounding satellite nodes after the second selection and sorting and the target coordinates, performing third selection and sorting on the surrounding satellite nodes after the second sorting, and taking the surrounding satellite nodes after the third sorting and sorting as the next sending nodes.
Preferably, in step S4, the third selecting and sorting of the second sorted surrounding satellite nodes may specifically include: and carrying out third selection on the surrounding satellite nodes after the second sorting and sorting according to the principle of near to far according to the distance. Therefore, in step S4, in addition to step S3, a satellite node closer to the target distance may be preferentially selected, and for example, the surrounding satellite nodes 5 may be selected by the third selection, and the surrounding satellite nodes 5 may be used as the next transmission node.
Step S5, inquiring the next sending node by broadcast (for example, it may be the call information in the broadcast information), confirming whether the link can be established, if the link can be established, using the next sending node as a new starting satellite, wherein the new starting satellite performs steps S2-S5, i.e., steps S2-S5 are repeated, and the next sending node of the new starting satellite is sequentially searched and selected until a terminal node capable of establishing a communication link with the target is found.
Preferably, the step S5 of confirming whether the link can be established may further include: if the link cannot be established, sequentially selecting surrounding satellite nodes as a next sending node according to the sequence after the third sorting, for example, if the satellite node after the third sorting cannot establish the link, sequentially selecting the satellite node after the third sorting and sorting the second as the next node, and so on. Under the condition that a certain or a plurality of surrounding satellite nodes can not provide links, the surrounding satellite nodes can judge whether the links can be established or not according to the current link capacity of the surrounding satellite nodes, and the links are fed back to the initial satellite through the response process of the broadcast information. The initial satellite re-applies for the next sending node according to the feedback decision so as to eliminate the network congestion phenomenon.
Preferably, step S5 may further include: and if the node which can establish the communication link with the target cannot be found, outputting network busy information. If the feedback that the communication link cannot be established by all surrounding satellite nodes is received, judging that the surrounding satellite nodes cannot establish the communication link according to the feedback, and outputting network busy information, for example, the network busy information can be output to a ground user.
In step S5, confirming whether a link can be established may further include:
if the link can be established but the transmission data volume can not meet the requirement, the sending rate of the data packet in the sending-end information is reduced to eliminate the network congestion phenomenon.
Wherein each satellite node has congestion information feedback capability. When the surrounding satellite nodes can establish a communication link but the transmission data volume cannot meet the requirement, the surrounding satellite nodes can feed back the related information to the initial satellite 1, and the initial satellite 1 only needs to reduce the sending rate of the data packet in the sending-end information according to the received feedback, so as to eliminate the network congestion phenomenon.
And step S6, sequentially sending the target coordinate information and the node broadcast information to the next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with the target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through the satellite nodes of the communication link, and sending the target response feedback to the sending end so as to establish a dynamic communication link from the sending end to the target.
Wherein, the starting satellite 1 can send the target coordinate information and the node broadcast information (for example, call information in the broadcast information) to the next sending node in sequence until being transferred to the terminal node capable of establishing a communication link with the target for the terminal node to establish contact with the target, for example, the end node may send the call information in a broadcast message to the target, which may receive the call information, then the target sends a response feedback to the terminal node, the terminal node sends a broadcast information (for example, response information) response feedback, the broadcast information (for example, response information) response feedback is sequentially fed back to each intermediate satellite node until the broadcast information is fed back to the initial satellite 1, namely, the starting satellite 1 receives the target response feedback transmitted by the terminal node through the satellite nodes of the communication link in sequence, sends the target response feedback to the transmitting end, so as to establish a dynamic communication link from the transmitting end to the target, and the transmitting end can start to transmit information after receiving the response feedback.
Step S7, the information of the originating terminal is transferred to the terminating node through the established dynamic communication link, so that the terminating node sends the information to the target.
If the communication link is established in step S6, the originating terminal sends information to the originating satellite 1 in step S7, and the originating satellite 1 starts sending information, that is, the information is transmitted to the terminating node through the established dynamic communication link, so that the terminating node sends the information to a target, for example, a target receiving terminal in fig. 2, which may be a target device on the ground or in the air.
Preferably, the step S7 transmits the originating information to the terminating node through the established dynamic communication link, which specifically includes: the originating information and the priority of the important information (e.g., the priority may be pre-established) are communicated to the terminating node via the established dynamic communication link such that the satellite node on the dynamic communication link transmits the originating information according to the priority of the important information. The information carrying important information priority is sent to surrounding satellite nodes through the established communication link, so that the surrounding satellite nodes transmit the information according to the priority, and the congestion phenomenon in the dynamic link can be avoided. The congestion control is used for solving the problem of information transmission when a node or a link is busy, the step adopts priority to realize link congestion control, and data is transmitted according to the priority when congestion occurs.
In addition, preferably, the congestion control policy may also be adopted in the above step, so that when guidance information for establishing connection by a link is transmitted, the priority principle may be adopted to ensure establishment of the link channel first, so as to eliminate the network congestion phenomenon.
Preferably, after the step S7, the method further includes the steps of:
and after the information transmission is finished, the initial satellite sends the end information to all surrounding satellite nodes in the dynamic communication link, and all surrounding satellite nodes interrupt the link to release link resources after receiving the end information.
To sum up, in the inter-satellite network communication method provided in the embodiments of the present invention, each node that establishes a communication link is found by a three-time ranking method after receiving an information sending request, target coordinate information and node broadcast information are sequentially sent to a next sending node until being transmitted to a terminal node that can establish a communication link with a target to establish a contact between the terminal node and the target, a target response feedback transmitted by the terminal node sequentially passing through satellite nodes of the communication link is received, the target response feedback is sent to a sending end to establish a dynamic communication link from the sending end to the target, information of the sending end is transmitted to the terminal node through the established dynamic communication link, so that the terminal node sends the information to the target, compared with a satellite network that employs a static routing method that requires multiple global stations for on-orbit management, inter-satellite network inter-satellite communication that employs the dynamic routing method of the present invention no longer determines an inter-satellite link connection relationship through a fixed routing table, the on-orbit autonomous management capability of the satellite network is improved, the dependence of satellite constellation management on a ground station is reduced, and the operation cost of a satellite constellation is reduced;
in addition, each node can dynamically acquire the real-time state of the peripheral nodes by utilizing broadcast distribution information, each satellite node can quickly establish a communication link with the available satellite nodes by utilizing directional information transmission, and after the network satellite nodes are determined, the communication link is established by adjusting the beam direction of the antenna to the corresponding satellite node, so that the method is very quick;
in addition, the information such as the orbit, the speed and the like of the surrounding satellite nodes in a communicable range is dynamically updated between the network satellite nodes, the information of the full-network satellite nodes does not need to be created, and the dynamic connection between the network satellite nodes is realized. The utilization efficiency of the network satellite nodes can be improved, and the autonomous dynamic reconstruction of the network can also be realized;
in addition, the intelligent satellite node selection function is provided, and the proper next network satellite node can be automatically judged and selected according to the information of a communication initiator and a communication receiver and by utilizing the principles of short communication time of surrounding satellite nodes, the nearest distance to a target and the like, so that the contradiction that the shortest path is selected or the hop count of the selected node is the minimum in the link design is avoided, in addition, the network congestion phenomenon is eliminated through a congestion control strategy, and the smooth transmission of information is ensured.
The following are embodiments of the apparatus of the present invention, details of which are not described in detail in the embodiments of the apparatus, and reference may be made to the corresponding embodiments of the method described above.
Second embodiment
Fig. 3 is a main block diagram of a communication satellite according to a second embodiment of the present invention. The communication satellite can realize the on-orbit autonomous management, the on-orbit rapid reconstruction and the high-efficiency operation dynamic routing method. Referring to fig. 3, the communication satellite includes: a request module 30, a first ordering module 31, a second ordering module 32, a third ordering module 33, a node-in-communication-link determining module 34, a communication-link establishing module 35, and an information sending module 36.
More specifically, the request module 30 is configured to receive an originating information sending request, where the originating initiates the information sending request, and sends target information to a satellite node in a current originating service area, the satellite node in the current originating service area is an originating satellite, and the target information includes at least one of an identity and position information of the target.
A first sequencing module 31, configured to analyze and calculate, according to received broadcast information of surrounding satellite nodes, to obtain communicable time with the surrounding satellite nodes, and perform first selection and sequencing on the surrounding satellite nodes according to the communicable time, where each satellite node in a satellite network transmits satellite node broadcast information to the surroundings in a broadcast manner, the satellite node broadcast information includes at least one of a speed, an orientation, and a link state of a satellite, and the surrounding satellite is a satellite in a communicable range of a starting satellite;
the second sorting module 32 is configured to determine surrounding satellite nodes in the target coordinate direction according to the target information in the information sending request, perform second selection on the surrounding satellite nodes sorted for the first time, and sort according to a relationship between the surrounding satellite nodes and the target coordinate direction;
the third sorting module 33 is configured to select and sort surrounding satellite nodes sorted for the second time for the third time according to the distance between the surrounding satellite nodes sorted for the second time and the target coordinates, and use the surrounding satellite nodes sorted for the first time after the third time as a next sending node;
and a node-in-communication-link determining module 34, configured to query the next sending node in a broadcast manner, determine whether the link can be established, and if the link can be established, use the next sending node as a new initial satellite, where the new initial satellite executes the first sorting module, the second sorting module, the third sorting module, and the node-in-communication-link determining module, and sequentially searches and selects the next sending node of the new initial satellite until a terminal node capable of establishing a communication link with the target is found.
The communication link establishing module 35 is configured to sequentially send the target coordinate information and the node broadcast information to a next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with the target to establish a connection between the terminal node and the target, receive a target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, and send the target response feedback to the sending end to establish a dynamic communication link from the sending end to the target;
and the information sending module 36 is used for transmitting the information of the transmitting end to the terminal node through the established dynamic communication link so that the terminal node sends the information to the target.
Preferably, the first sequencing module 31 is specifically configured to calculate a communicable time and a relative position relationship between the starting satellite and surrounding satellite nodes according to the received surrounding satellite node broadcast information; and selecting surrounding satellite nodes with communicable time larger than the threshold time, and sequencing the surrounding satellite nodes with communicable time larger than the threshold time for the first time from long to short.
Preferably, the second sorting module 32 is specifically configured to select surrounding satellite nodes with the spatial orientation in the target coordinate direction from the surrounding satellite nodes after the first sorting, and perform the second sorting on the surrounding satellite nodes with the orientation in the target coordinate direction.
Preferably, the third sorting module 33 is specifically configured to perform third selection on the surrounding satellite nodes sorted for the second time and sort according to the distance from near to far.
Preferably, the information sending module 36 is further configured to transmit the originating information and the priority of the important information to the terminating node through the established dynamic communication link, so that the satellite node on the dynamic communication link transmits the originating information according to the priority of the important information.
Preferably, the node-in-communication-link determining module 34 is further configured to output network busy information if a node capable of establishing a communication link with the target cannot be found; and if the link can be established but the transmission data volume cannot meet the requirement, reducing the sending rate of the data packet in the transmitting-end information.
According to the above embodiment, the present invention also provides an inter-satellite network communication system, which includes: in the second embodiment, the plurality of communication satellites include an initial satellite initiating communication and a plurality of surrounding satellite nodes, each of the plurality of communication satellites includes a request module, a first sorting module, a second sorting module, a third sorting module, a node determination module in a communication link, a communication link establishment module, and an information transmission module, and the communication link establishment module of the initial satellite is configured to adjust an antenna beam direction to correspond to a next satellite node to transmit target coordinate information and node broadcast information to the next transmission node, until a previous satellite node of a satellite terminal node points to a terminal node capable of establishing a communication link with a target by adjusting the antenna beam direction, so as to complete transmission of the target coordinate information and the node broadcast information from the initial satellite to the terminal node.
To sum up, the communication satellite provided in the embodiment of the present invention finds each node establishing a communication link by a triple ordering method by receiving an information sending request, sequentially sends target coordinate information and node broadcast information to a next sending node until the node is transmitted to a terminal node capable of establishing a communication link with a target for the terminal node to establish contact with the target, receives a target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, sends the target response feedback to a sending end to establish a dynamic communication link from the sending end to the target, transmits the information of the sending end to the terminal node through the established dynamic communication link, so that the terminal node sends the information to the target, compared with a satellite network adopting a static routing method that requires globally establishing more stations for on-orbit management, inter-satellite network inter-satellite communication adopting the dynamic routing method of the present invention no longer determines an inter-satellite link connection relationship through a fixed routing table, the on-orbit autonomous management capability of the satellite network is improved, the dependence of satellite constellation management on a ground station is reduced, and the operation cost of a satellite constellation is reduced;
in addition, each node can dynamically acquire the real-time state of the peripheral nodes by utilizing broadcast distribution information, each satellite node can quickly establish a communication link with the available satellite nodes by utilizing directional information transmission, and after the network satellite nodes are determined, the communication link is established by adjusting the beam direction of the antenna to the corresponding satellite node, so that the method is very quick;
in addition, the information such as the orbit, the speed and the like of the surrounding satellite nodes in a communicable range is dynamically updated between the network satellite nodes, the information of the full-network satellite nodes does not need to be created, and the dynamic connection between the network satellite nodes is realized. The utilization efficiency of the network satellite nodes can be improved, and the autonomous dynamic reconstruction of the network can also be realized;
in addition, the intelligent satellite node selection function is provided, and the proper next network satellite node can be automatically judged and selected according to the information of a communication initiator and a communication receiver and by utilizing the principles of short communication time of surrounding satellite nodes, the nearest distance to a target and the like, so that the contradiction that the shortest path is selected or the hop count of the selected node is the minimum in the link design is avoided, in addition, the network congestion phenomenon is eliminated through a congestion control strategy, and the smooth transmission of information is ensured.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. An inter-satellite network communication method is characterized by comprising the following steps:
s1, receiving an information sending request of a sending end, wherein the sending end sends the information sending request and sends target information to a satellite node of a current sending end service area, the satellite node of the current sending end service area is a starting satellite, and the target information comprises at least one of the identity and the position information of the target;
s2, according to the received broadcast information of the surrounding satellite nodes, analyzing and calculating to obtain the communicable time with the surrounding satellite nodes, and performing first selection and sequencing on the surrounding satellite nodes according to the communicable time, wherein each satellite node in the satellite network transmits the broadcast information of the satellite nodes to the surroundings in a broadcast mode, the broadcast information of the satellite nodes comprises at least one of the speed, the direction and the link state of the satellite, and the surrounding satellite is the satellite in the communicable range of the initial satellite;
s3, according to the target information in the information sending request, determining the surrounding satellite nodes in the target coordinate direction, and according to the relationship between the surrounding satellite nodes and the target coordinate direction, performing second selection and sequencing on the surrounding satellite nodes subjected to first sequencing;
s4, according to the distance between the secondary selected and sequenced surrounding satellite nodes and the target coordinates, the secondary sequenced surrounding satellite nodes are selected and sequenced for the third time, and the tertiary sequenced surrounding satellite nodes are used as the next sending nodes;
s5, inquiring the next sending node in a broadcasting mode, confirming whether a link can be established, and if the link can be established, taking the next sending node as a new initial satellite, wherein the new initial satellite carries out the steps S2-S5, and the next sending node of the new initial satellite is searched and selected in sequence until a terminal node which can establish a communication link with a target is found;
s6, sequentially sending the target coordinate information and the node broadcast information to the next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with the target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, and sending the target response feedback to the sending end so as to establish a dynamic communication link from the sending end to the target;
and S7, transmitting the information of the originating terminal to the terminal node through the established dynamic communication link so that the terminal node sends the information to the target.
2. The method according to claim 1, wherein the step S5 of confirming whether the link can be established further comprises:
and if the link can not be established, sequentially selecting the surrounding satellite nodes as the next sending node according to the sequence after the third sorting.
3. The inter-satellite network communication method according to claim 1, wherein step S2 specifically includes:
calculating the communicable time and relative position relation between the initial satellite and the surrounding satellite nodes according to the received surrounding satellite node broadcast information;
and selecting surrounding satellite nodes with communicable time larger than the threshold time, and sequencing the surrounding satellite nodes with communicable time larger than the threshold time for the first time from long to short.
4. The inter-satellite network communication method according to claim 1, wherein step S3 specifically includes:
and selecting surrounding satellite nodes of the space orientation in the target coordinate direction from the surrounding satellite nodes after the first sequencing, and performing second sequencing on the surrounding satellite nodes of the space orientation in the target coordinate direction.
5. The inter-satellite network communication method according to claim 1, wherein the third selecting and sorting of the second sorted surrounding satellite nodes in step S4 specifically includes:
and carrying out third selection on the surrounding satellite nodes after the second sorting and sorting according to the principle of near to far according to the distance.
6. The method according to claim 1, wherein the step S7 is to transmit the information of the originating end to the terminating node through the established dynamic communication link, and specifically includes: and transmitting the information of the transmitting end and the priority of the important information to the terminal node through the established dynamic communication link, so that the satellite node on the dynamic communication link transmits the information of the transmitting end according to the priority of the important information.
7. The method according to claim 1, wherein step S5 further comprises:
and if the node which can establish the communication link with the target cannot be found, outputting network busy information.
8. The method according to claim 1, wherein the step S5 of confirming whether the link can be established further comprises:
and if the link can be established but the transmission data volume cannot meet the requirement, reducing the sending rate of the data packet in the transmitting-end information.
9. A communication satellite, comprising: a request module, a first ordering module, a second ordering module, a third ordering module, a node determination module in a communication link, a communication link establishment module and an information sending module, wherein,
the request module is used for receiving an information sending request of a sending end, wherein the sending end sends the information sending request and sends target information to a satellite node of a current sending end service area, the satellite node of the current sending end service area is a starting satellite, and the target information comprises at least one of identity and position information of a target;
the satellite network comprises a first sequencing module, a second sequencing module and a third sequencing module, wherein the first sequencing module is used for analyzing and calculating the communicable time with surrounding satellite nodes according to received surrounding satellite node broadcast information, and performing first selection and sequencing on the surrounding satellite nodes according to the communicable time, each satellite node in the satellite network transmits satellite node broadcast information to the surroundings in a broadcast mode, the satellite node broadcast information comprises at least one of the speed, the direction and the link state of a satellite, and the surrounding satellite is a satellite in a communicable range of a starting satellite;
the second sorting module is used for determining surrounding satellite nodes in the target coordinate direction according to the target information in the information sending request, and performing second selection and sorting on the surrounding satellite nodes subjected to the first sorting according to the relation between the surrounding satellite nodes and the target coordinate direction;
the third sorting module is used for carrying out third selection and sorting on the peripheral satellite nodes sorted for the second time according to the distances between the peripheral satellite nodes sorted for the second time and the target coordinates, and taking the peripheral satellite nodes sorted for the first time after the third sorting as next sending nodes;
the communication link node determining module is used for inquiring the next sending node in a broadcasting mode to determine whether the link can be established or not, and if the link can be established, the next sending node is used as a new initial satellite, wherein the new initial satellite performs the functions of the first sequencing module, the second sequencing module, the third sequencing module and the communication link node determining module, and the next sending node of the new initial satellite is searched and selected in sequence until a terminal node capable of establishing the communication link with the target is found;
the communication link establishing module is used for sequentially sending the target coordinate information and the node broadcast information to the next sending node until the target coordinate information and the node broadcast information are transmitted to a terminal node capable of establishing a communication link with the target so as to establish contact between the terminal node and the target, receiving target response feedback transmitted by the terminal node sequentially through satellite nodes of the communication link, and sending the target response feedback to the sending end so as to establish a dynamic communication link from the sending end to the target;
and the information sending module is used for transmitting the information of the transmitting end to the terminal node through the established dynamic communication link so that the terminal node sends the information to the target.
10. The communication satellite of claim 9, wherein the first sequencing module is specifically configured to calculate a communicable time and a relative position relationship between the start satellite and surrounding satellite nodes according to the received surrounding satellite node broadcast information; and selecting surrounding satellite nodes with communicable time larger than the threshold time, and sequencing the surrounding satellite nodes with communicable time larger than the threshold time for the first time from long to short.
11. The communication satellite of claim 9, wherein the second sorting module is specifically configured to select surrounding satellite nodes with a spatial orientation in the target coordinate direction from the surrounding satellite nodes sorted for the first time, and sort the surrounding satellite nodes with the orientation in the target coordinate direction for the second time.
12. The communication satellite of claim 9, wherein the third sorting module is specifically configured to select the surrounding satellite nodes sorted for the second time for the third time and sort the surrounding satellite nodes according to the distance on a near-to-far basis.
13. The communications satellite of claim 9, wherein the information sending module is further configured to communicate the originating information and the priority of the important information to the terminating node via the established dynamic communications link, such that the satellite node on the dynamic communications link transmits the originating information according to the priority of the important information.
14. The communication satellite of claim 9, wherein the node-in-communication-link determination module is further configured to output a network busy message if a node that can establish a communication link with the target cannot be found; and if the link can be established but the transmission data volume cannot meet the requirement, reducing the sending rate of the data packet in the transmitting-end information.
15. An inter-satellite network communication system, comprising: the plurality of communication satellites according to any one of claims 9 to 14, the plurality of communication satellites including an originating satellite initiating communication and a plurality of surrounding satellite nodes, the plurality of communication satellites each including a request module, a first ordering module, a second ordering module, a third ordering module, a node-in-communication-link determination module, a communication link establishment module, and an information transmission module, the communication link establishment module of the originating satellite being configured to transmit the target coordinate information and the node broadcast information to a next transmission node by adjusting an antenna beam pointing to a corresponding next satellite node until a previous satellite node of the satellite terminal nodes points to a terminal node that can establish a communication link with the target by adjusting the antenna beam pointing to complete the transfer of the target coordinate information and the node broadcast information from the originating satellite to the terminal node.
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| CN114844550A (en) * | 2021-01-31 | 2022-08-02 | 华为技术有限公司 | Satellite network routing method, device, equipment, system and readable storage medium |
| CN113411810B (en) * | 2021-05-24 | 2023-02-21 | 广东省大湾区集成电路与系统应用研究院 | Space-based Internet of things communication system |
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