低信噪比直序扩频导航信号的自适应捕获算法研究  

Adaptive Acquisition Algorithm for Low S/N DS/SS Navigation Signal

作　　者：杨朝斌[1] 

机构地区：[1]四川大学计算机学院,四川成都610064

出　　处：《四川大学学报（工程科学版）》2009年第5期217-220,共4页Journal of Sichuan University (Engineering Science Edition)

摘　　要：为解决低信噪比下直序扩频导航信号的捕获,提出了一种自适应捕获算法。该算法基于相干相关模型及FFT,提高了后测信噪比、缩短了捕获时间。对GPS C/A信号的捕获进行了仿真实验,结果表明此算法明显优于非相干相关算法,可提供约2 dB左右处理增益,捕获灵敏度达到-175 dBW。该算法可以运用于其它类似的卫星定位与直序扩频测距信号的伪码精确跟踪及相位测量中。A adaptive acquisition algorithm,based on coherent correlation model and FFT,is presented for DS/SS navigation signal under low signal to noise ration.By this algorithm,the S/N after testing is improved and acquisition time is become shorted.The simulation results of GPS C/A signal acquisition indicated that the performance of this algorithm is better than non-coherent correlation,about 2 dB gain is gotten and the signal-175 dBW at sensitivity level can be acquired.This algorithm is applicable to tracking a...

关 键 词：信噪比 直序扩频(DS/SS) 自适应相干相关 捕获 快速傅立叶变换 

分 类 号：TN966[电子电信—信号与信息处理]