基于短时相关和FFT的GPS L2C信号捕获算法  

A GPS L2C signal acquisition method based on the combination of short time correlation and FFT

作　　者：周航[1] 巴晓辉[1] 陈杰[1] 张洪伦 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《电子技术应用》2015年第10期81-83,87,共4页Application of Electronic Technique

基　　金：国家自然科学基金资助项目(61221004)

摘　　要：设计并实现了一种基于短时相关结合FFT的GPS L2 Civil(L2C)信号捕获算法。针对该算法,分析了本地码采用Return-to-Zero Civil-Moderate(RZ CM)码和Non Return-to-Zero Civil-Moderate(NRZ CM)码时的捕获性能,并采用码相位比较策略进一步提升发现概率。仿真结果表明,在选用RZ CM码并采用码相位比较策略时,该算法对载噪比为29 d BHz的信号发现概率在90%以上,对载噪比为28 d BHz的信号发现概率也能达到60%。An acquisition method based on the combination of short time correlation and FKF is designed and implemented for GPS L2 Civil （L2C） signal. The performance of both Return-to-Zero Civil-Moderate （RZ CM） and NonRetur-to-Zero Civil-Moderate （NRZ CM） replica code is analyzed in this paper. The strategy of code phase comparison is also used to improve detection probability. As shown in the simulation results, by using RZ CM replica code and code phase comparison strategy, the detection probability of this acquisition method is more than 90% for the signal with （Carrier to Noise Ratio）CNR at 29 dBHz, and is about 60% for the signal with CNR at 28 dBHz.

关 键 词：GPS L2C信号 短时相关 FFT 码相位比较 

分 类 号：TN927[电子电信—通信与信息系统]