微弱GPS信号矢量频率锁定环设计  

Vector frequency lock loop design for weak GPS signal

作　　者：罗士栋[1,2] 张洪伦 巴晓辉 陈杰 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《哈尔滨工程大学学报》2017年第12期1964-1968,共5页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(61376027)

摘　　要：载波跟踪环是传统独立式GPS接收机最脆弱的环节,针对弱信号环境下其比伪码跟踪环路更容易失锁的问题,本文给出一种基于矢量频率锁定环(vector-frequency lock loop,VFLL)的载波跟踪方法。给出VFLL理论推导及实现过程,并以最小二乘估计方法证明VFLL在载波跟踪性能上优于频率锁定环(frequency lock loop,FLL)。静止场景时9颗卫星实验结果显示,本文给出的方法能够实现14 d B/Hz微弱GPS信号的载波跟踪。In a traditional stand-alone GPS receiver, the carrier-tracking loop is the weakest link that loses hock more easily than the code-tracking loop in a weak signal environment. To solve this problem, a carrier-frequency tracking method based on vector-frequene） lock loop （VFLL） is presented. The details of theoretical derivation and implementation of VFLL are given, and the weighted least squares method proves that the tracking performance of VFLL is better than that of a frequency lock loop （FLL）. In a static scene, the experimental results by utilizing 9 satellites show that YFLL can maintain lock with C/No values as low as 14 dB/Hz.

关 键 词：微弱GPS信号 矢量跟踪 矢量频率锁定环 高灵敏度 频率锁定环 标量跟踪 载波跟踪 

分 类 号：TN967.1[电子电信—信号与信息处理]