摘要
针对全球定位系统(GPS)在高动态环境下信号跟踪精度不高以及容易失锁的问题,提出一种新的跟踪方法.采用锁频环(FLL)和锁相环(PLL)相融合的跟踪方式,利用判决因子对当前的跟踪状态进行判定,根据判决值对FLL和PLL输出赋予相应的权值,调整其相对作用的大小,从而将FLL和PLL在同一跟踪过程中更好地融合.仿真结果表明,该方法在环路噪声带宽较小的情况下能够成功地跟踪加速度为150 g的超高动态GPS信号.
To solve the problem of bad GPS tracking performance under high dynamic condition, a new tracking method integrated with frequency-locked loop (FLL) and phase-locked loop (PLL) was proposed. A judge factor is employed to define the current tracking state. In order to regulate the relative contribu- tion of FLL and PLL to the tracking process, the FLL and PLL outputs are given with different weights based on the judge factor. This weight adjustment can perform a better integration of FLL and PLL in the tracking process. The simulation results prove that the method can be used to track the GPS signal of 150 g acceleration with small noise bandwidth.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2012年第6期854-858,864,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金(40674002)
上海航天基金(0202)资助项目
关键词
全球定位系统
高动态跟踪
锁频锁相融合
权值调整
global positioning system (GPS)
high dynamic condition tracking
integration of frequency lock loop(FLL) and phase lock loop(PLL)
weight adjustment
作者简介
匡鸿博(1984-),男,江西吉安市人,硕士生,主要从事高动态GPS信号处理方面的研究;联系人:茅旭初,男,副教授,电话(Tel.):021-34204424,E-mail:maoxc@sjtu.edu.cn.