A Spectrum Sensing Method Based on Cooperation of Multiple LEO Satellites

Abstract

The invention discloses a spectrum sensing method based on cooperation of multiple low-orbit satellites, which includes three parts: target signal enhancement, interference signal suppression and spectrum judgment. The target signal enhancement step uses multiple low-orbit satellites to form an array to make the Steering vectors are superimposed in phase in the direction of the target signal to improve the receiving strength of the low-orbit satellites to the target signal; the interference signal suppression step is to make the null direction of the pattern formed by the array satellites align with the direction of the interference signal under the above conditions. And through the correlation algorithm, the receiving strength in the null direction of the pattern is as small as possible, so as to suppress the interference signal to the greatest extent; the spectrum judgment step is to compare the received signal energy after the satellite array with the judgment threshold, and obtain the corresponding Probability of correct detection. The method can effectively improve the receiving signal-to-interference-noise ratio when multiple low-orbit satellites perform spectrum sensing on the target signal, and improve the perception performance of the target signal when there is an interference signal.

Description

technical field [0001] The invention relates to a low-orbit satellite spectrum sensing method based on multi-satellite cooperation, which belongs to wireless communication technology. Background technique [0002] With the increase and continuous development of wireless network requirements, the shortage of spectrum resources has received more and more attention. Cognitive radio technology allows unlicensed users to opportunistically use licensed users' frequency bands, thereby effectively improving the utilization of spectrum resources. , to a certain extent, can alleviate the problem of shortage of spectrum resources. At present, with the improvement of people's requirements for wireless communication, the quality of wireless communication based only on the ground network can no longer meet people's needs, which promotes the rapid development of the sky network, such as the proposal of the space-ground integrated network. In the space-ground integrated network, improving ...

AI Technical Summary

Problems solved by technology

For example, the long-distance transmission of the signal sent by the ground network will cause the signal strength value received by the star network to be very small, which will affect the detection performance of the star node to the ground node

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