Cooperative spectrum sensing method based on GEO and LEO double-layer satellite network

Abstract

The invention discloses a cooperative spectrum sensing method based on a GEO and LEO double-layer satellite network. The cooperative spectrum sensing method comprises three functional modules including a task evaluation module, a strategy scheduling module and an information fusion module. Firstly, in a task evaluation module, a GEO satellite evaluates an overall task according to task input parameters, and the area, the number and the sensing precision of sensing targets are determined; and then, in a strategy scheduling module, the GEO satellite selects a single-satellite spectrum sensing strategy and a multi-satellite cooperative sensing strategy according to whether the single-satellite sensing precision can meet the task evaluation requirement or not. And finally, in an information fusion stage, the GEO respectively summarizes the perception data of each alliance, and judges a plurality of task targets. According to the method, seed satellite selection and coalition game are combined, the task requirements of different levels can be met for multi-target cooperative sensing, the missed detection probability and the false alarm probability which are contradictory in multi-satellite cooperative sensing are considered, the overall error rate of the two probabilities is effectively reduced, and the spectrum sensing performance is improved.

Description

technical field [0001] The invention relates to a collaborative spectrum sensing method based on a GEO and LEO double-layer satellite network, which belongs to wireless communication technology. Background technique [0002] Low-orbit satellites have the characteristics of wide coverage, short satellite-to-earth distance, low communication delay, and small propagation loss, and the constellation composed of multiple low-orbit satellites can achieve global (including two poles) seamless coverage, which can effectively overcome ground communication networks. Insufficient in coverage, it has broad application prospects. In recent years, in-depth research on low-orbit satellites has been carried out at home and abroad, and some companies have even proposed large-scale constellation systems composed of hundreds or thousands of LEO satellites, such as SpaceX and OneWeb, which represent the future development direction of satellite communications. On the other hand, with the devel...

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Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem of weak perception ability of LEO single satellite, the present invention provides a collaborative sensing method based on task-driven GEO and LEO double-layer satellite network, using GEO as the backbone node of the network to undertake task evaluation and implementation of collaborative algorithms, The LEO satellite senses the spectrum of the mission target according to the GEO command; in order to take into account the contradictory probability of missed detection and false alarm probability in the multi-satellite cooperative sensing, the present invention also proposes a multi-satellite cooperative algorithm based on the alliance game, and the number of mission targets As the number of divided alliances, LEO satellites form alliances to sense targets separately; the method of the present invention can improve spectrum sensing performance and reduce the overall error rate in spectrum detection

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