互相关干扰下微弱GPS信号的直接检测算法  

A Direct Detection Algorithm for Weak GPS Signals with the Presence of Cross-Correlation Interference

作　　者：董翔[1] 赵振维[1] 刘世萱[2,3] 王波[2,3] 刘海丰[2,3] 林乐科[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107 [2]山东省海洋环境监测重点实验室,山东青岛266001 [3]山东省科学院海洋仪器仪表研究所,山东青岛266001

出　　处：《全球定位系统》2013年第1期1-7,共7页Gnss World of China

基　　金：国家自然科学基金(批准号:61201097);山东省自然科学基金(批准号:ZR2012DL14);山东省科学院博士基金;宇航动力学国家重点实验室基金(批准号:2011ADL-DW0301);航天飞行动力学技术重点实验室开放基金(批准号:2012afdl033)

摘　　要：微弱GPS信号的检测是当前的研究热点之一。基于GPS C/A码的互相关干扰理论模型,详细分析研究了强弱信号间的相对载波多普勒频移对互相关干扰的影响,在此基础上,研究了一种新的基于相对载波多普勒频移的微弱GPS信号直接检测算法,该算法不需要对互相干扰进行扣除,计算量小、便于工程实现,仿真结果表明:当干扰信号高出弱信号29dB时,该算法依然可以达到90%以上的检测成功概率。Detection of weak GPS signals is one of the popular research topics. Based on the theoretical model of GPS C/A code cross-correlation interference, the effect of relative Doppler carrier on the interference is discussed in detail. Subsequently, a novel and efficient detection algorithm of weak GPS signals is investigated and analyzed. The new algorithm directly acquires the weak signals with the presence of cross-correlation interference, which is easy to implement and has a small amount of calculations, simulating results show that the success rate of the detection algorithm exceeds 90% when the level of interference signals is 29 dB higher than that of weak signals.

关 键 词：全球卫星定位系统 互相关干扰 相对多普勒频移 检测 

分 类 号：TN96[电子电信—信号与信息处理]