Route cognizing method of interstellar links of multi-level satellite communication system

Abstract

The invention discloses a route selection algorithm applied to a heterogeneous network of a multi-level satellite communication system, in which a cognitive routing algorithm based on learning is adopted and the problem of non-uniform link selection due to many end-to-end links in the heterogeneous satellite links is solved. Each link utilization rate value is cached in the route selection process, and by analyzing the link utilization rate at different moments and introducing a smoothing factor to predict the link utilization rate of the next moment, the conditions such as congestion time delay and the like around can be quickly and accurately sensed so as to achieve the aim of adaptively selecting the routing path, thereby balancing the whole load of the global heterogeneous network. The multi-layer satellite communication system comprises two satellites under a high orbit and a satellite on a medium-low orbit.

Description

technical field [0001] The invention relates to a cognitive routing algorithm applied to an interstellar link of a multi-level satellite communication system, belonging to the technical field of satellite communication. Background technique [0002] Satellite communication is the radio communication carried out by multiple earth stations (including land, water surface and atmosphere) on the earth using artificial communication satellites in the air as relay stations. The communication satellite consists of several transponders, several antennas, position and attitude control, telemetry and command, and power supply subsystems. Its main function is to transmit signals from various earth stations. [0003] According to the working orbit, satellite communication systems are generally divided into the following three categories: [0004] Low-orbit satellite communication system (LEO): 500-2000Km from the ground, the transmission delay and power consumption are relatively small,...

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Problems solved by technology

[0008] In this heterogeneous satellite communication system, the choice of routing is a primary consideration, because the continuous switching of nodes in the LEO system will cause link congestion, and the nodes of the GEO system will have long delays. In the system, different routing methods need to be considered for the communication systems of different layers. Inappropriate routing may not reflect the superiority of this heterogeneous multi-level space communication system, but will bring more serious problems.

[0009] According to the above, since the satellite link has the characteristics of long delay and high bandwidth, and there are many reachable links in the heterogeneous network, how to choose the appropriate path is a difficult problem.

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