基于XFAST技术的L2 CM信号快速捕获算法研究  

Research on fast acquisition algorithm for L2 CM signal based on XFAST technique

作　　者：胡辉[1] 路春[1] 吴超 姚当 饶云峰[3] 

机构地区：[1]华东交通大学信息工程学院,江西南昌330013 [2]中国移动通信集团江西有限公司抚州分公司,江西抚州344000 [3]中国科学院国家授时中心,陕西西安710600

出　　处：《电子技术应用》2013年第11期118-121,共4页Application of Electronic Technique

基　　金：国家自然科学基金资助项目(61162015);江西省科技支撑计划项目(20123BBE50098)

摘　　要：L2C信号是美国GPS系统现代化新增的民用信号。由于GPS L2C信号周期较长,使用传统捕获技术,会因运算量大而导致捕获速度变慢。基于XFAST技术,实现了快速GPS L2 CM信号捕获算法,并推导了算法的处理增益,检测性能与运算量等指标。算法分析结果表明,当输入信噪比为-19 dB时,相干积分时间选为5 ms,本地折叠4段时,算法的处理增益为44 dB,在虚警概率为P fa=10-2条件下,检测概率为P d=0.863 2,此时与经典频域捕获方法相比,乘法运算节省了77.7%,加法运算节省了78.7%。L2C signal is a new civil signal in the modernization of the GPS system in the United States. Due to the long cy- cle of GPS L2C signal, traditional capture technology will led to slow operations, this article based on XFAST technology, imple- mentation of the GPS L2 CM signal fast acquisition algorithm. This article has analysis the key factors processing gain, detection performance and operation volume of this algorithm etc. According to analysis results by selecting integral time for 5 ms, local col- lapsed 4 paragraph processing way, the experimental results show that in -19 dB environment conditions, can accurate achieved fast acquisition, theory analysis results displayed the algorithm of processing gain for 44.078 2 dB, probability of false alarm conditions Pf,=10-2, detection probability for P,1=0.863 2; operation volume analysis indicates that multiplication operation has saved 77.7%, Additions for 78.7% savings.

关 键 词：GPS L2C 捕获 XFAST 

分 类 号：TP92[自动化与计算机技术]