Routing selection method based on uncertain link parameters in low earth orbit satellite network

Abstract

The invention belongs to the technical field of satellite communication, and particularly relates to a route selection method based on uncertain link parameters in a low earth orbit satellite network. The method comprises the following steps: acquiring a satellite network topological graph, and selecting a source satellite node and a target satellite node; calculating the shortest path between the source satellite node and the target satellite node and marking the shortest path; whether the source satellite node and the target satellite node are located at the same position on the orbit or not is judged, and if yes, the marked shortest path serves as the optimal path; otherwise, satellite nodes capable of forming a quadrangle are selected around the shortest path; adopting a membership function to describe uncertain parameters of links in the satellite network; according to the uncertain parameters, comprehensive evaluation values of all links in the quadrangle are calculated; selecting the path with the lowest link comprehensive evaluation value as the optimal route; according to the method, a complex satellite network environment is considered, path search is realized by reducing the search space of routing, and the routing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and relates to a routing method based on uncertain link parameters in a low-orbit satellite network. Background technique [0002] Satellite network is an important part of celestial integration network. With the rapid development of communication technology, it has been widely used in people's daily life. For example: telemedicine, weather forecasting and disaster relief and other fields. Low Orbit Earth (LEO) satellite networks have become a research hotspot at home and abroad due to their wide coverage, low transmission delay, small propagation loss, strong anti-destroy capability, and flexible networking methods. Since the LEO satellite constellation consists of multiple satellites, when the satellites cooperate to complete the data transmission in the network, the path selection between the source node and the destination node becomes diversified. Therefore, the research on ...

AI Technical Summary

Problems solved by technology

In addition, LEO satellites operate in a complex outer space environment, which will lead to uncertainties in link information. The stability of the inter-satellite link is poor, making the inter-satellite distance uncertain, resulting in the uncertainty of the delay information; on the other hand, people's evaluation criteria for the link information are also uncertain, in different There will be different evaluation criteria under different scenarios and requirements

Traditional satellite routing strategies are calculated based on certain link conditions, often ignoring the space environment in which the satellite is located

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