高动态条件下直扩信号快速同步技术研究  

Fast Synchronization of DSSS Signal in High Dynamic Environment

作　　者：王子龙[1] 侯建[1] 

机构地区：[1]北京电子工程总体研究所,北京100854

出　　处：《现代防御技术》2013年第6期102-107,共6页Modern Defence Technology

摘　　要：针对高动态条件下,短周期伪码直扩信号的快速同步问题进行了研究。分析了高动态条件下大多普勒频率对解码的影响,并对现有捕获方法进行了讨论。在此基础上提出了能够快速消除大多普勒频率影响的同步方案,且进行了仿真,验证了该方案能够在严格的硬件资源要求下保证同步的快速性。该同步方案采用FFT伪码分析法对直扩信号进行捕获,利用基于FFT的频率估计方法消除多普勒频率对解码的影响,利用延迟锁定环路消除伪码延迟对解码的影响。The issue of fast synchronization in high dynamic environment for the short cycle PN （pseudo noise）code DSSS （direct sequence spread spectrum） signal is discussed. The adverse effect of large Doppler frequency on decoding is analyzed, so are the existing acquisition methods. Then a reason- able synchronization method is given to fast eliminate the effect of large Doppler frequency. Simulation shows that this method can guarantee the fast speed of synchronization under restricted hardware require- ment. This method adopts the FFT （fast Fourier transformation）-based PN-code an signal acquisition and the FFT-based frequency estimation to eliminate the infection the delay-locked loop to eliminate the infection of PN code phase deviation. aly of sis method used for Doppler frequency,

关 键 词：高动态 快速同步 直扩 

分 类 号：TN914.4[电子电信—通信与信息系统]