基于北斗授时和星历的卫星跳频通信方法  

Frequency Hopping Communication Method for Satellites Using BeiDou Time Service and Ephemeris

作　　者：崔勇强[1] 陈曦[2] 熊华[3] 李洪星 

机构地区：[1]中南民族大学电子信息工程学院,湖北武汉430074 [2]武汉大学国际软件学院,湖北武汉430079 [3]湖北三峡职业技术学院,湖北宜昌443000 [4]上海航天电子技术研究所,上海201109

出　　处：《武汉大学学报（信息科学版）》2016年第12期1643-1648,共6页Geomatics and Information Science of Wuhan University

基　　金：中央高校基本科研业务费专项(CZQ16001)~~

摘　　要：提出了一种基于北斗授时和卫星星历实现跳频同步并且适用于卫星与地面站上下行链路的跳频通信方法。首先基于卫星星历,采用SGP4模型预测卫星轨道,计算卫星与地面站的相对位置和相对速度,然后估计电波传播时延和多普勒频偏,最后在地面站分别进行预校正与补偿,完成星地的高速跳频通信。仿真实验结果表明,与传统的跳频系统相比,该方法硬件复杂度低,电波传播时延估计精度优于300ns,归一化多普勒频偏估计精度优于1×10^(-8),开销为1%时跳频速率可达20 000Hops/s,具有优良的抗干扰和抗截获性能。In this paper,a novel Frequency Hopping（FH）communication scheme for communication between a satellite and ground station based on the Beidou time service and satellite ephemeris is proposed.Satellite orbits are predicted by the SGP4 model based on satellite ephemeris and the propagation delay and Doppler shift are estimated.The estimated results are used for pre-correction and compensation at the ground station.Results show that t propagation delay estimation accuracy is better than 300 ns,so the FH rate reaches 20 000Hops/s with a cost of 1%.The normalized Doppler shift error is less than 1×10^（-8）.The proposed method can operate under low SNR conditions or strong jamming,as it does not rely on the pilot or sync head.This optimized scheme has lower complexity and better anti-jamming capability.

关 键 词：北斗授时 卫星星历 SGP4模型 多普勒频偏 跳频速率 

分 类 号：P228.4[天文地球—大地测量学与测量工程] TN927[天文地球—测绘科学与技术]