CN116865843B - System and method for distributing links between satellites of satellite system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to the technical field of satellite communication, and provides a system and a method for distributing links between satellites of a satellite system, wherein the system comprises the following steps: a cost calculation module; a minimum matching module; the cost calculation module is used for calculating the communication cost between satellites in the satellite system and the registration cost for establishing a communication link between the satellites, and determining the total cost of each satellite according to the communication cost and the registration cost; the minimum matching module is used for establishing a satellite communication diagram by taking each satellite in the satellite system as a node, a communication link between each satellite as an edge, and total cost as weight of the edge, and determining optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram. The invention abstracts the inter-satellite link allocation problem into the general graph matching problem in graph theory, and utilizes the cost and the satellite as nodes and edge weights in the graph and takes the minimum cost path as an allocation optimization strategy, thereby improving the operation and optimization efficiency of the satellite communication system.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a system and a method for distributing links between satellites of a satellite system.
Background
With the increasing demands of broadband communication, wireless communication and global communication, satellite communication systems are becoming an important field as a communication method with wide area coverage and high bandwidth. However, satellite communication systems suffer from problems such as limited bandwidth resources, high transmission delays, susceptibility of inter-satellite links to interference, etc.
Inter-satellite link optimization refers to a technique that improves the performance and efficiency of satellite communication systems by optimizing the link parameters and configuration between satellites. The technology can maximally utilize limited bandwidth resources, improve the bandwidth utilization rate of the satellite communication system, and increase the capacity of the satellite communication system by optimizing inter-satellite links, thereby improving the overall performance of the satellite communication system.
For inter-satellite link allocation optimization, the existing method is mostly a graph theory-based heuristic algorithm, and the method refers to searching an optimal or near optimal solution for solving the problem by combining heuristic search and knowledge of graph theory. However, this method requires continuous iterations in solving the optimal solution or near optimal solution to obtain the final result. The iterative process takes a lot of time, which is not allowed in the practical use process, because one of the key indexes of the communication is real-time, and if the optimization process requires a lot of time, the satellite communication may have a phenomenon of insufficient bandwidth or insufficient capacity when the optimization is completed. Therefore, how to increase the solving speed of the optimization algorithm is a problem to be solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system and a method for distributing links between satellites of a satellite system, which aim to solve the technical problem that the real-time performance of link distribution between satellites caused by adopting iterative computation in the prior art cannot meet the requirements of satellite communication.
In a first aspect of the present invention, there is provided an inter-satellite link distribution system for a satellite system, comprising:
a cost calculation module;
a minimum matching module;
the cost calculation module is used for calculating the communication cost between satellites in a satellite system and the registration cost for establishing a communication link between satellites, and determining the total cost of each satellite according to the communication cost and the registration cost;
the minimum matching module is used for establishing a satellite communication diagram by taking each satellite in the satellite system as a node, a communication link between each satellite as an edge and total cost as weight of the edge, and determining optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram.
Optionally, the cost calculation module specifically includes:
a communication cost calculation unit;
the communication cost calculation unit determines the communication cost between satellites in the satellite system according to the time delay between the two satellites.
Optionally, the satellites in the satellite system include an overseas satellite and an anchor satellite, and the time delay between the two satellites is determined based on the types of the two satellites participating in the communication.
Optionally, the expression for determining the communication cost between satellites in the satellite system is specifically:
wherein,representing anchor satellite->The communication cost of the overseas satellite and the overseas satellite is-1, the communication cost of the overseas satellite and the anchor satellite is 0, and the communication cost of the anchor satellite and the overseas satellite is 1.
Optionally, the cost calculation module specifically includes:
a registration cost unit;
the registration cost unit determines the registration cost for establishing a communication link between satellites in a satellite system according to the number of connections between a target satellite and the same non-target satellite.
Optionally, an expression for determining a registration cost for establishing a communication link between satellites in the satellite system is specifically:
wherein,representing the target satellite and->The non-target satellites establish a matrix of variance costs, i.e. registration costs,indicating the number of visible particles of the target satellite, +.>Representing the cumulative number of connections of the target satellite, +.>Representing the average cumulative number of connections for the target satellite.
Optionally, the cost calculation module specifically includes:
a total cost unit;
the total cost unit determines the total cost of each satellite according to the communication cost and the registration cost, and the expression of the total cost is specifically:
wherein,for the total cost->For communication costs->For registering costs->And->The communication cost weight and the registration cost weight, respectively.
Optionally, the minimum matching module specifically includes:
a satellite communication diagram establishing unit;
an optimal link allocation unit;
wherein the satellite communication diagram establishing unit takes each satellite in the satellite system as a nodeThe communication link between each satellite is taken as side +.>Total cost as weight of edge +.>Establishing a satellite communication map->；
Wherein the optimal link allocation unit is based on the satellite communication diagramAnd determining the optimal link allocation of the satellite system by the matching path with the minimum weight.
Optionally, the determining the optimal link allocation for the satellite system uses a modified flowering algorithm in the satellite communications mapThe matching path with the smallest weight is searched, the matching path is used as a link allocation optimal strategy, and the expression of the searching process of the improved flowering algorithm is specifically as follows:
wherein,indicating whether a link is established, 1 is established, 0 is not established,/>And->Respectively are provided withThe serial numbers of the two satellites are represented,the total cost of the satellite with the number i and the satellite with the number j in the satellite communication diagram is shown.
In a second aspect of the present invention, there is provided a method for allocating links between satellites in a satellite system, including:
calculating the communication cost between satellites in a satellite system and the registration cost for establishing a communication link between satellites, and determining the total cost of each satellite according to the communication cost and the registration cost;
and establishing a satellite communication diagram by taking each satellite in the satellite system as a node, taking a communication link between each satellite as an edge and total cost as an edge weight, and determining optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram.
The invention has the beneficial effects that: the system and the method for distributing the links among satellites of the satellite system abstract the link distribution problem among satellites into a general graph matching problem in graph theory. The node cost and the registration cost are calculated through the cost calculation module, the minimum matching module takes the cost and the satellite as the node and the edge weight in the graph, and a minimum cost path is searched in the graph by utilizing an improved flowering algorithm, and the minimum cost path is taken as an allocation optimization strategy. Because the distribution problem is abstracted into the graph matching problem, the improved flowering algorithm can be used for quickly obtaining the optimal distribution strategy, thereby improving the running and optimizing efficiency of the satellite communication system.
Drawings
FIG. 1 is a schematic diagram of a link distribution system between satellites of a satellite system according to the present invention;
fig. 2 is a flow chart of a method for allocating links between satellites in a satellite system according to the present invention.
Reference numerals:
10-a cost calculation module; 20-minimum matching module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
referring to fig. 1, fig. 1 is a schematic structural diagram of an inter-satellite link distribution system of a satellite system according to an embodiment of the present invention.
As shown in fig. 1, an inter-satellite link distribution system of a satellite system includes: a cost calculation module 10 and a minimum matching module 20.
It should be noted that, the cost calculating module 10 is configured to calculate a communication cost between satellites in a satellite system and a registration cost for establishing a communication link between satellites, and determine a total cost of each satellite according to the communication cost and the registration cost; the minimum matching module 20 is configured to establish a satellite communication diagram with each satellite in the satellite system as a node, a communication link between each satellite as an edge, and a total cost as a weight of the edge, and determine an optimal link allocation of the satellite system based on a matching path with a minimum weight in the satellite communication diagram.
Specifically, because of the graph-based heuristic algorithm adopted by the existing inter-satellite link allocation optimization, the process of solving the optimal solution or the near optimal solution generally needs to iterate continuously to obtain a more accurate result, but a great amount of time consumed by the iteration continuously has irreconcilable contradiction with the real-time required by satellite communication in practical application, such as the problem that the bandwidth or capacity of the current satellite communication is insufficient when the optimization is completed.
In this embodiment, the total cost of satellite communication is obtained by calculating the satellite communication cost and the calculation cost respectively, then a satellite communication graph is established based on the total cost and each satellite node, the inter-satellite link allocation problem is abstracted into a general graph matching problem in graph theory, and the optimal allocation strategy of the inter-satellite link is determined by obtaining the cost path with the minimum weight in the satellite communication graph.
In a preferred embodiment, the cost calculation module 10 specifically includes: and a communication cost calculation unit. The communication cost calculation unit determines the communication cost between satellites in the satellite system according to the time delay between the two satellites.
In particular, satellites in the satellite system include overseas satellites and anchor satellites, and the time delay between the two satellites is determined based on the types of the two satellites participating in the communication. The expression for determining the communication cost between satellites in the satellite system is specifically as follows:
wherein,representing anchor satellite->The communication cost of the overseas satellite and the overseas satellite is-1, the communication cost of the overseas satellite and the anchor satellite is 0, and the communication cost of the anchor satellite and the overseas satellite is 1.
The anchor satellite refers to a fixed satellite, and the overseas satellite refers to a satellite that moves all the time. In this embodiment, the communication cost calculation unit evaluates the node cost with reference to a time delay determined by the types of the two satellites involved in the communication, that is, different communication costs are respectively given depending on whether the two satellites involved in the communication are anchor satellites or overseas satellites. In a satellite communication system, anchor satellites are the main communication nodes, the positions of which are fixed, and the communication switching between the anchor satellites generates higher cost, so that the anchor satellites are used for the communicationHas a value of 1, overseasIn the satellite time movement, communication can be realized only after the satellite enters the communication range of the anchor satellite in general, so that the communication cost of the overseas satellite and the overseas satellite is-1, the communication cost of the overseas satellite and the anchor satellite is 0, and the lower the cost is, the higher the distribution level is.
In this embodiment, different communication costs are given to each satellite according to whether two satellites participating in communication are anchor satellites or overseas satellites, which is used as a part of consideration in measuring the priority of link allocation between satellites, so that the effectiveness of the optimal allocation strategy is ensured while the operation efficiency of the satellite communication system is improved.
In a preferred embodiment, the cost calculation module 10 specifically includes: registering the cost unit. The registration cost unit determines a registration cost for establishing a communication link between satellites in the satellite system based on the number of connections between the target satellite and the same non-target satellite.
Specifically, an expression for determining the registration cost for establishing a communication link between satellites in a satellite system is:
wherein,representing the target satellite and->The non-target satellites establish a matrix of variance costs, i.e. registration costs,indicating the number of visible particles of the target satellite, +.>Representing the cumulative number of connections of the target satellite, +.>Representing the average cumulative number of connections for the target satellite.
It should be noted that, the registration cost calculating unit is responsible for calculating the cost of establishing a communication link by a satellite, and when a satellite establishes a link with the same satellite for multiple times, the observation data is redundant, which wastes the link resources of the satellite. In this embodiment, the registration cost unit evaluates the node cost by the number of connections between the target satellite and the non-target satellite, and determines the registration cost by calculating a variance cost matrix for establishing the link. When the number of times that one satellite is connected with the same satellite is increased, the variance cost is increased gradually, and the distribution level of the link is reduced; variance costs are minimal when one satellite never establishes contact with another satellite.
In this embodiment, according to the number of links established between the target satellite and the non-target satellite involved in communication, the registration cost is determined by calculating the variance cost matrix of the established links, which is used as another part of consideration in measuring the priority of link allocation between satellites, so as to ensure the effectiveness of the optimal allocation strategy while improving the operation efficiency of the satellite communication system.
In a preferred embodiment, the cost calculation module 10 specifically includes: and (5) a total cost unit.
The total cost unit determines the total cost of each satellite according to the communication cost and the registration cost, and the expression of the total cost is specifically:
wherein,for the total cost->For communication costs->For registering costs->And->The communication cost weight and the registration cost weight, respectively.
In the present embodiment, after the communication cost and the registration cost are obtained by the cost calculation module 10, the total cost of each satellite is determined according to different weight settings. Thereafter, the allocation of communication links may be optimized by targeting the sum of the total costs of the links to be minimized after each satellite within the satellite system has been allocated links for optimal link allocation based on the total cost of the acquired satellites.
In a preferred embodiment, the minimum matching module 20 specifically includes: the satellite communication diagram establishing unit and the optimal link distribution unit.
The satellite communication diagram establishing unit takes each satellite in the satellite system as a nodeThe communication link between each satellite is taken as side +.>Total cost as weight of edge +.>Establishing a satellite communication diagramThe method comprises the steps of carrying out a first treatment on the surface of the Said optimal link allocation unit is based on said satellite communication map->And determining the optimal link allocation of the satellite system by the matching path with the minimum weight.
Based on the principle of optimizing the allocation of the communication links with the goal of minimizing the total cost of the links in the present application, in this embodiment, the inter-satellite link allocation problem is first abstracted into a general graph matching problem in graph theory, where the graph matching problem is based on that each satellite is used as a nodeThe communication link between each satellite is taken as side +.>Total cost as weight of edge +.>Established satellite communication diagram->Through satellite communication map->The matching path with the minimum weight is determined by the weight of the edges between each node, and the optimal solution of the link distribution is calculated in a non-iterative mode as an optimal strategy of the link distribution, so that the problems of poor real-time performance and inadaptation to satellite communication in the inter-satellite link distribution in the prior art are solved.
In a preferred embodiment, the determining of the optimal link allocation for the satellite system uses a modified flowering algorithm in the satellite communications mapThe matching path with the smallest weight is searched, the matching path is used as a link allocation optimal strategy, and the expression of the searching process of the improved flowering algorithm is specifically as follows:
wherein,indicating whether a link is established, 1 is established, 0 is not established,/>And->Representing two satellites respectivelyIs used for the number of the sequence number of (c),the total cost of the satellite with the number i and the satellite with the number j in the satellite communication diagram is shown.
In the present embodiment, a satellite communication map is usedImproved bloom algorithm is used in determining optimal link allocation for satellite systems, i.e. by applying the algorithm to the satellite communication map->On the basis of the method, the state (1 is established, not 0 is established) of establishing a link between satellites when the weight (total satellite cost) is minimum is obtained to serve as an obtained optimal solution of link allocation, so that the optimization of link allocation in a satellite system is realized, and the running and optimizing efficiency of the satellite communication system is improved.
Therefore, the present embodiment proposes a satellite-to-satellite link distribution system, which abstracts the inter-satellite link distribution problem into a general graph matching problem in graph theory. The node cost and registration cost are calculated by the cost calculation module 10, the minimum matching module 20 takes the cost and satellite as the node and edge weight in the graph, and the minimum cost path is searched in the graph by utilizing the improved flowering algorithm, and the minimum cost path is taken as the allocation optimization strategy. Because the distribution problem is abstracted into the graph matching problem, the improved flowering algorithm can be used for quickly obtaining the optimal distribution strategy, thereby improving the running and optimizing efficiency of the satellite communication system.
Referring to fig. 2, fig. 2 is a flow chart of a method for allocating links between satellites in a satellite system according to an embodiment of the present invention.
As shown in fig. 2, a method for allocating links between satellites in a satellite system includes the steps of:
s1: calculating the communication cost between satellites in a satellite system and the registration cost for establishing a communication link between satellites, and determining the total cost of each satellite according to the communication cost and the registration cost;
s2: taking each satellite in the satellite system as a node, taking a communication link between each satellite as an edge, taking the total cost as the weight of the edge, establishing a satellite communication diagram, and determining the optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram;
in this embodiment, the link allocation problem between satellites is abstracted into a general graph matching problem in graph theory, and the cost and satellites are used as nodes and edge weights in the graph, and the minimum cost path is used as an allocation optimization strategy, so that the operation and optimization efficiency of the satellite communication system is improved.
The specific implementation of the inter-satellite link distribution method of the satellite system is basically the same as the embodiments of the inter-satellite link distribution system of the satellite system, and will not be described herein.
In describing embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "inner", "outer", "inside", "outside", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Wherein "inside" refers to an interior or enclosed area or space. "peripheral" refers to the area surrounding a particular component or region.
In the description of embodiments of the present invention, the terms "first," "second," "third," "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" and a fourth "may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In describing embodiments of the present invention, it should be noted that the terms "mounted," "connected," and "assembled" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, unless otherwise specifically indicated and defined; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of embodiments of the invention, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
In describing embodiments of the present invention, it will be understood that the terms "-" and "-" are intended to be inclusive of the two numerical ranges, and that the ranges include the endpoints. For example, "A-B" means a range greater than or equal to A and less than or equal to B. "A-B" means a range of greater than or equal to A and less than or equal to B.
In the description of embodiments of the present invention, the term "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An inter-satellite link distribution system for a satellite system, comprising:
a cost calculation module;
a minimum matching module;
the cost calculation module is used for calculating the communication cost between satellites in a satellite system and the registration cost for establishing a communication link between satellites, and determining the total cost of each satellite according to the communication cost and the registration cost;
the minimum matching module is used for establishing a satellite communication diagram by taking each satellite in the satellite system as a node, a communication link between each satellite as an edge and total cost as weight of the edge, and determining optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram.
2. The inter-satellite link distribution system according to claim 1, wherein the cost calculation module specifically comprises:
a communication cost calculation unit;
the communication cost calculation unit determines the communication cost between satellites in the satellite system according to the time delay between the two satellites.
3. The inter-satellite system inter-satellite link distribution system according to claim 2, wherein the satellites in the satellite system include an overseas satellite and an anchor satellite, and the time delay between the two satellites is determined based on the types of the two satellites participating in the communication.
4. An inter-satellite link distribution system according to claim 3, wherein the expression for determining the cost of communication between satellites in the satellite system is:
；
wherein,representing anchor satellite->The communication cost of the overseas satellite and the overseas satellite is-1, the communication cost of the overseas satellite and the anchor satellite is 0, and the communication cost of the anchor satellite and the overseas satellite is 1.
5. The inter-satellite link distribution system according to claim 1, wherein the cost calculation module specifically comprises:
a registration cost unit;
the registration cost unit determines the registration cost for establishing a communication link between satellites in a satellite system according to the number of connections between a target satellite and the same non-target satellite.
6. The inter-satellite link distribution system according to claim 5, wherein the expression for determining the registration cost for establishing a communication link between satellites in the satellite system is:
；
wherein,representing the target satellite and->Variance cost matrix of link established by non-target satellite, i.e. registration cost, < >>Indicating the number of visible particles of the target satellite, +.>Representing the cumulative number of connections of the target satellite, +.>Representing average accumulation of target satellitesNumber of connections.
7. The inter-satellite link distribution system according to claim 1, wherein the cost calculation module specifically comprises:
a total cost unit;
the total cost unit determines the total cost of each satellite according to the communication cost and the registration cost, and the expression of the total cost is specifically:
；
wherein,for the total cost->For communication costs->For registering costs->And->The communication cost weight and the registration cost weight, respectively.
8. The inter-satellite link distribution system according to claim 1, wherein the minimum matching module specifically comprises:
a satellite communication diagram establishing unit;
an optimal link allocation unit;
wherein the satellite communication diagram establishing unit takes each satellite in the satellite system as a nodeThe communication link between each satellite is taken as side +.>Total cost as weight of edge +.>Establishing a satellite communication map->；
Wherein the optimal link allocation unit is based on the satellite communication diagramAnd determining the optimal link allocation of the satellite system by the matching path with the minimum weight.
9. The inter-satellite link distribution system according to claim 8, wherein said determining optimal link distribution for the satellite system uses a modified flowering algorithm in the satellite communications mapThe matching path with the smallest weight is searched, the matching path is used as a link allocation optimal strategy, and the expression of the searching process of the improved flowering algorithm is specifically as follows:
；
wherein,indicating whether a link is established, 1 is established, 0 is not established,/>And->Respectively representing the sequences of two satellites, +.>The total cost of the satellite with the number i and the satellite with the number j in the satellite communication diagram is shown.
10. A method for assigning links between satellites in a satellite system, comprising:
calculating the communication cost between satellites in a satellite system and the registration cost for establishing a communication link between satellites, and determining the total cost of each satellite according to the communication cost and the registration cost;
and establishing a satellite communication diagram by taking each satellite in the satellite system as a node, taking a communication link between each satellite as an edge and total cost as an edge weight, and determining optimal link allocation of the satellite system based on a matching path with the minimum weight in the satellite communication diagram.
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