Low-orbit multi-beam power positioning time service method and device

Abstract

The invention relates to a low-orbit multi-beam power positioning time service method and device. The method comprises the following steps: calculating a beam power value received by a user according to a satellite signal, free space transmission loss and a user receiving antenna gain; a satellite field angle is obtained according to the set relation between the user and a satellite, and when the user receives a plurality of beam signals, power observation noise is considered, and a multi-beam power observation equation set is established by using the satellite field angle and a beam power value received by the user; carrying out linear expansion on the multi-beam power observation equation set and solving a root of the multi-beam power observation equation set after linear expansion to obtain a pitch angle and an azimuth angle between the satellite and the user; and deducing the distance between the user and the satellite and the elevation level information of the user by using the link loss and the pitch angle and azimuth angle between the satellite and the user, and obtaining a positioning time service result. By adopting the method, the approximate position and the local time of the user can be obtained in a low-orbit satellite scene.

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