一种强弱信号并存时的GPS弱信号检测方法  

GPS weak signal detection method when strong and weak signals coexist

作　　者：秦红磊[1] 孙兴丽[1] 丛丽[1] 薛瑞[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《解放军理工大学学报（自然科学版）》2013年第4期360-364,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61101077);国家973计划资助项目(2011CB707004);国家科技支撑计划资助项目(2011BAH24B02)

摘　　要：对于微弱GPS卫星信号的检测,一般采用增加预检测积分时间(PIT)的方法,每颗卫星采用相同的PIT。在实际环境中,很多情况是强弱信号并存的,采用相同的PIT会降低GPS信号检测的效率。为此,提出了一种可变门限的微弱GPS信号检测方法,即先采用较短的PIT对强信号进行检测,再采用较长的PIT对弱信号进行检测。通过对检测概率、虚警概率和漏警概率的分析和实际信号的测试验证,证明该方法可大大提高在强弱信号并存时GPS信号的检测效率。To detect weak GPS satellite signal, generally, the method is used of increase the Pre-detection integration time （PIT）, and each satellite uses the same PIT. In the actual environment, in many cases the strong signal and weak signal coexist, when the same PIT is used, the efficiency of the GPS signal to be detected is reduced. This paper proposed a variable threshold method for the weak GPS signal detec- tion, i.e. first strong signals were detected using the shorter PIT, and then using longer PIT detect weak signals. By analysis detection probability, false alarm probability, leakage alarm probability and signal tes- ting have proved that this method can greatly improve the GPS signal detection efficiency of the coexis- tence of the strong and weak signal.

关 键 词：GPS 微弱信号 捕获 检测概率 

分 类 号：TN967.2[电子电信—信号与信息处理]