GPS 数字接收机中 C/A 码搜索算法与实现  

GPS C/A Code Search and Implement in GPS Receiver

作　　者：孙礼[1] 张其善[1] 

机构地区：[1]北京航空航天大学电子工程系

出　　处：《北京航空航天大学学报》1998年第5期506-509,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家重点科技攻关资助项目

摘　　要：从ＧＰＳ信号结构出发，介绍了ＧＰＳ时域／频域的二维序贯搜索原理．在虚警概率、检测概率与搜索速率分析的基础上，对几种序贯搜索方法性能进行了比较，提出并以实验验证了以并行１２通道扩频相关器为基础的ＧＰＳＣ／Ａ码捕获数字系统实现方案，改进的搜索算法的采用有效地缩短了码平均捕获时间并提高了捕获的可靠性，并成功地应用于ＧＰＳ数字接收机中．From GPS signal charcteristics,time/frequency two dimension sequential search principle is introduced in this paper.Three basic sequential search techniques and an improved search technique are compared with performances of false alarm probability,detection probability and searching rate.A digital system based on spread spectrum correlator is proposed and verified for GPS C/A code acquisition,while parameters are trade off for better performance.The improved search algorithm is adopted for shortening average acquisition time and improving acquiring reliability.It has been successfully used in digital GPS receiver.

关 键 词：接收机 伪随机码 卫星导航 算法 GPS 

分 类 号：TN967.1[电子电信—信号与信息处理]