卫星通信中多普勒频偏的预校正  

Doppler shift estimation and pre-compensation of satellite communication

作　　者：孙川[1] 梅顺良[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电波科学学报》2006年第2期224-228,共5页Chinese Journal of Radio Science

摘　　要：在低轨道卫星通信中,由于多普勒效应,无线电信号会产生频率偏移现象,这为接收机设计带来了一定的困难。一种新方法可用于消除多普勒频偏的影响:根据卫星与地面接收站之间的相对位置和速度,可预先计算出信号的多普勒频偏。据此实时地修正接收机中数字频率合成器输出的本振频率,以达到消除多普勒频偏的目的。For low earth orbit （LEO） satellite communication, a frequency shift from the Doppler effect can cause some design difficulty of the receiver. A new method for compensate influence of the Doppler shift is presented in this paper. According to relative position and velocity between satellite and ground station, the amount of Doppler shift during communication time are beforehand calculated, then resonance frequency of the DDS is adjusted in real time to compensate the frequency shift and eliminate the effect of Doppler.

关 键 词：低轨道卫星通信 轨道参数 多普勒频偏 直接数字频率合成器 

分 类 号：TN927[电子电信—通信与信息系统]