基于FPGA的高动态扩频信号快捕系统的设计与实现  

Design and Implementation of the Acquisition of High Dynamic DSSS Signals Based on FPGA

作　　者：陈源[1] 袁嗣杰[1] 章兰英[1] 贾宁宁[1] 

机构地区：[1]装备指挥技术学院航天测控中心,北京101416

出　　处：《遥测遥控》2008年第6期47-52,共6页Journal of Telemetry,Tracking and Command

摘　　要：针对高动态扩频信号捕获时间较长的问题,提出利用非均匀采样产生2组相差半个伪码码元的正交信号,直接在基带信号上估计多普勒频偏的方法。方法减少了本地伪码捕获过程中的调整周期。通过软硬件程序仿真,证明了该方法的可行性,与传统捕获方法相比,大大减少了扩频信号的捕获时间。In order to solve the problem that it spends much time to acquire the high dynamic DSSS signals,this paper presents a method taking advantage of non-uniform sampling to generate two groups of orthogonal signals which have the phase difference a- bout 1/2 PN chip.This method directly estimates the Doppler shift at the base hand,and also decreases the period of adjusting the pseudo noise code in the course of acquisition process.The simulation results prove that compared with the traditional acquisition method of DSSS signas,this method can significantly reduce the time of acquisition process.

关 键 词：扩频信号 快速捕获 FPGA 

分 类 号：TN914.42[电子电信—通信与信息系统]