GPS信号差分相干累积捕获技术  

GPS Signal Differemtial Coherent Accumulation Method Acquisition Algorithm Research

作　　者：胡辉[1] 袁媛[1] 路春[1] 

机构地区：[1]华东交通大学信息工程学院,江西南昌330013

出　　处：《哈尔滨理工大学学报》2012年第6期36-40,共5页Journal of Harbin University of Science and Technology

基　　金：江西省教育厅科学技术研究项目(GJJ10458);江西省工业支撑计划(赣财教[2010]229号)

摘　　要：针对传统GPS捕获算法不能实现微弱GPS信号捕获的问题,在实现长相干积分时间的前提下,采用差分相干累积法,在传统非相干处理的流程中引入了差分处理技术,使该算法融合了相干积分法和非相干积分法各自的优点,不仅解决了相干积分法对导航数据位翻转敏感的问题,而且减少了非相干积分法的平方损耗影响.此外,还对相干积分法和非相干积分法的弱信号捕获性能分别进行了比较分析.实验结果表明:在20 ms积分时间的条件下,差分相干累积法的灵敏度仅比灵敏度最高的相干积分法少1dB,而运算量仅为该算法的0.25%,最适于微弱GPS信号捕获.Traditional acquisition algorithm can not acquire the weak GPS signal in the realization of long coherent integration time conditions.This paper presents a differemtial coherent accumulation method by using the differential process technology which is introduced in the process of non-coherent processing,and makes this method combine the advantages of coherent integration method and non-coherent integration method.It not only solves the issue of coherent integration method that is sensitive to navigation data bit-reversed,and reduces square loss impact of non-coherent integration method.In addition,we compare it with the coherent integration and non-coherent integration method for weak signal acquisition performance.The results show that： in the 20ms integration time,the sensitivity of differential coherent accumulation method is only less than method with the highest sensitivity 1dB.While the computation is only 0.3% of the coherent integration algorithm,the differential coherent accumulation method is most suitable for weak GPS signal acquisition.

关 键 词：GPS捕获 灵敏度 相干积分法 非相干积分法 差分相干累积算法 运算量 

分 类 号：TN91[电子电信—通信与信息系统]