一种低轨卫星通信的定时提前计算方法

A timing advance calculation method for Low Earth Orbit satellite communication

摘要:

低轨(LEO)卫星网络作为地面网络的重要补充，是未来天地一体化网络的重要组成部分。由于LEO卫星的高移动速度以及星地通信的大传播距离造成了高传播时延，因此需要新的针对LEO卫星星地通信背景的上行链路的定时提前量(TA)的计算策略。本文基于LEO卫星的星地通信场景，介绍了TA及其在协议中的规定，并针对LEO卫星的特点，提出一种LEO卫星通信的定时提前计算方法。通过仿真分析验证了所提方案的有效性，为LEO卫星星地通信系统的设计提供了参考。

Abstract:

As an important supplement to the terrestrial network, the Low Earth Orbit(LEO) satellite network is an important part of the future earth-earth integrated network. However, due to the high moving speed of LEO satellites and the long propagation distance of satellite-ground communication, large propagation delay is caused, therefore a new calculation strategy for the Timing Advance(TA) of the uplink in the satellite-ground communication background of LEO satellites is needed. Based on the satellite-earth communication scenario of LEO satellite, TA and its provisions in the protocol are introduced firstly. Then, according to the characteristics of LEO satellite, a timing advance calculation method of LEO satellite communication is proposed. The effectiveness of the proposed scheme is verified by simulation analysis, which provides a reference for the design of satellite-earth communication system of LEO satellite.