一种机载卫星通信终端频率捕获跟踪算法  

A Frequency Acquisition and Tracking Algorithm of Airborne Satellite Communication Terminal

作　　者：段勇存 王力男[1] 裴文端[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2016年第3期33-36,共4页Radio Communications Technology

摘　　要：作为一种特殊的卫星通信设备,机载卫星通信终端在工作环境上和普通通信终端有很大的区别。在终端通信过程中,多普勒频移变化给频率捕获和跟踪带来了很大的困难。针对机载终端通信过程中多普勒频移变化快的问题,提出一种多波束载波频偏估计算法。详细描述了频率捕获和同步跟踪的过程,通过利用相邻波束的频率校正信道,在每一个TDMA帧中搜索频率校正信息,可以在较短时间内锁定频率和定时信息。通过MATLAB对算法进行了仿真,结果表明该算法能有效地解决载波快速捕获与精确跟踪的问题。As a special satellite communication equipment,the airborne satellite communication terminal operates in an environment very different from common communication terminals.Under the circumstances of high Doppler shift,it is difficult to achieve frequency acquisition and tracking in the process of communication. To solve the problem that airborne terminal＇s Doppler frequency shift changes quickly in the process of communication,this paper presents a multibeam carrier frequency offset estimation algorithm.The process of frequency capture and synchronous tracking is described in detail. During this process,the algorithm searches frequency correction information of each TDMA frame by using the frequency correction channel of adjacent beam,in another word it can determine the initial frequency and timing information in a relatively short period of time. The algorithm is simulated by MATLAB,and the results show that it can effectively implement fast carrier acquisition and accurate tracking.

关 键 词：机载终端 相邻波束 多普勒频移 频率捕获跟踪 

分 类 号：TN929.5[电子电信—通信与信息系统]