A Method for Obtaining the Antenna Direction of LEO Broadband Satellite Communication Terminal Based on Ephemeris

Abstract

The invention discloses an ephemeris-based low-orbit broadband satellite communication terminal antenna direction acquisition method. The method comprises an ephemeris acquisition method, a satelliteselection method and a direction generation method. In the ephemeris acquisition method, a communication terminal receives a simplified and compressed single-satellite ephemeris broadcast by a singlesatellite through a broadcast receiving antenna; and the constellation ephemeris of the whole constellation is deduced according to the received single-satellite ephemeris. In the satellite selectionmethod, a target satellite needing to be aligned for initial access is selected according to the constellation ephemeris and the position of the communication terminal. In the direction generation method, an antenna direction of the communication terminal is calculated according to the target satellite. The ephemeris acquisition method, a satellite selecting strategy and a tracking method can be applied in a scene under the condition that the frequency resources are limited, the receive gain of a terminal antenna is extremely low, and the satellite needs to be continuously switched; and the problem of acquisition of basic satellite position information during the initial access of low-orbit broadband satellite communication is solved.

Description

technical field [0001] The invention relates to the technical field of low-orbit broadband satellite communication. More specifically, it relates to a method for acquiring the antenna direction of a low-orbit broadband satellite communication terminal based on ephemeris. Background technique [0002] In order to provide users with communication services with larger capacity and higher speed, the communication frequency of satellite communication has to choose a higher frequency band to meet the communication needs of larger bandwidth and faster speed. In order to make full use of frequency orbit resources and provide a communication experience closer to the ground network, low-orbit satellite communication is a good choice. The high-frequency communication frequency will make the beam angle of the user communication equipment antenna narrower. Using low-orbit communication satellites, the satellite position is not fixed, and the stored satellite position cannot be used for ...

AI Technical Summary

Problems solved by technology

The antenna in the existing geostationary orbit satellite communication can adopt the program tracking method, which has a certain similarity with the application scene of the present invention, but it only tracks one satellite, and its satellite position can be regarded as fixed, which is different from the present invention in ephemeris acquisition. , satellite selection, and pointing methods are different

Images