一种突发通信下扩频信号捕获及频偏跟踪方法  

An Approach of Acquiring Spread Spectrum Signal and Tracking Frequency Deviation under Burst Communication

作　　者：王爱荣[1] 雷刚[1] 岳三创[1] 

机构地区：[1]西安电子工程研究所,西安710100

出　　处：《火控雷达技术》2014年第4期42-44,59,共4页Fire Control Radar Technology

摘　　要：针对短时、突发式测控系统中直接扩频序列(Direct Spread Spectrum Sequence,DSSS)信号在大多普勒频偏下的即时捕获问题,在研究多普勒频偏对码捕获性能影响的基础上,提出了一种多载波通道并行、时域卷积匹配滤波捕获和基于快速傅里叶变换(Fast Fourier Transform,FFT)的载波跟踪方法,该方法结构简单,捕获与跟踪于一体,在FPGA中可以快速实现低信噪比条件下扩频信号的捕获并准确对多普勒频率进行校正跟踪。Aiming at intermediate acquisition issue of DSSS （ Direct Spread Spectrum Sequence ） signal in short-time burst test and control system, on basis of studying effect of Doppler frequency deviation on code acquisition performance, an approach of tracking carrier wave based on FFT （ Fast Fourier Transform） by using multiple carrier wave channel in parallel and time domain convolution matched filtering acquisition is presented. Being integrated with acquisition and tracking into one body, this approach is simple in structure; it can be used to implement ac-quisition of spread spectrum signal and perform correction tracking Doppler frequency accurately under condition of low signal –to-noise ratio fast.

关 键 词：DSSS 多普勒频偏 伪码捕获 FPGA 

分 类 号：TN911.7[电子电信—通信与信息系统]