Weak GPS Signal Acquisition Method Using Variable Threshold  

作　　者：CONG Li MENG Hailuo QIN Honglei NIU Jingyi 

机构地区：[1]School of Electronics and Information Engineering, BeiHang University, Beijing 100191, China [2]No.205 Institute of China Weaponry Industrial Group, Xi'an, Shanxi 710065, China

出　　处：《Chinese Journal of Electronics》2013年第4期838-842,共5页电子学报（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China （No.61101077）.

摘　　要：Coherent integration and non-coherent ac- cumulation have been developed to acquire weak Global position system （GPS） signals. The threshold of acquisi- tion algorithm is fixed, and is determined by the weak- est signal. Strong signals and weak signals always coexist in the physical environment. A new method is presented for weak GPS signal acquisition using variable thresh- old. Through adjusting the thresholds with different non- coherent accumulation times, this method is applicable to all kinds of signals. It has wonderful acquisition efficiency through theory analysis and real signal verification, espe- cially when strong signals and weak signals coexist, it can greatly reduce acquisition time.

关 键 词：Global position system （GPS） Weak sig- nal ACQUISITION Variable threshold. 

分 类 号：TN919.32[电子电信—通信与信息系统] P228.4[电子电信—信息与通信工程]