深空通信中基于FFT的高动态扩频信号的捕获  

Acquisition of High Dynamic SS Signal Based on FFT in Deep Space Communication

作　　者：焦健[1] 张钦宇[1] 李晖[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055

出　　处：《电讯技术》2007年第6期40-43,共4页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(60672089)

摘　　要：在深空通信中,航天器的高动态性使扩频信号引入了高Doppler频移,给捕获造成了巨大困难。针对如此之大的Doppler频移,提出了一种新的捕获方案,即基于FFT算法实现对Doppler频移进行一定程度的补偿,将沿码相位-Doppler频率的二维搜索简化为沿码相位的一维搜索;重点分析了深空通信环境中高速长PN码的捕获性能。理论分析和仿真结果表明,该方法大大缩短了捕获时间,是一种性能优良的伪码捕获方法。In the deep space communications, it has huge difficulty to acquire spread spectrum（SS） signals with high Doppler shifts for a receiver. A new receiver architecture is presented, which estimates the Doppler shift during the PN phase acquisition. This method can search the code phase and estimate the Doppler shifts simultaneously. The acquisition capability of the high speed long PN code in deep space communication systems is emphasized. The simulation and analysis show that the FFT- based method can efficiently accelerate the acquisition process.

关 键 词：深空通信 扩频信号 并行捕获 FFT算法 Doppler频移 相关 

分 类 号：TN911.7[电子电信—通信与信息系统]