北斗弱信号快收敛载波跟踪算法

任志玲; 杨春燕; 牛江龙

doi:10.15892/j.cnki.djzdxb.2016.04.032

2016 , Vol. 36 >Issue 4: 125 - 127

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2016.04.032

摘要

针对传统载波跟踪环路对弱信号跟踪误差较大的问题,提出了线性卡尔曼滤波器载波跟踪算法,算法以载波相位差作为状态量,以鉴相器的输出作为观测量,将原增益矩阵与跟踪项相加作为线性卡尔曼滤波的增益矩阵。仿真实验结果表明,在信噪比为-30dB时,快速收敛算法仍能保持对信号的跟踪,而传统算法已经失锁,相对于传统载波跟踪算法,快速收敛的卡尔曼载波跟踪算法能够有效提高跟踪的精度,并且收敛速度较快。

关键词： 北斗卫星导航系统; 卡尔曼滤波; 载波跟踪; 弱信号

本文引用格式

任志玲 , 杨春燕 , 牛江龙 . 北斗弱信号快收敛载波跟踪算法[J]. 弹箭与制导学报, 2016 , 36(4) : 125 -127 . DOI: 10.15892/j.cnki.djzdxb.2016.04.032

Abstract

Since traditional carrier tracking loop has serious tracking error in the environment of weak signals, the Kalman filter tracking algorithm was proposed, in which carrier error is considered as statement and the phase detector is used as measurement. The filter gain is the add of former gain and the tracking term. The simulation results show that when SNR is 30 dB, the faster tracking algorithm can keep tracking the signals, while the traditional carrier tracking loop has lost the signals. The Kalman filter tracking algorithm can improve the performance of the carrier tracking loop compared with traditional algorithm, meanwhile, the convergence rate can be improved.

Key words： Beidou navigation satellite system; Kalman filter; carrier tracking; weak signal

[an error occurred while processing this directive]

参考文献

[1]	谢钢. GPS 原理与接收机设计[M]. 北京: 电子工业出版社, 2009: 320- 375.
[2]	董绪荣, 唐斌, 蒋德. 卫星导航软件接收机原理与设计[M]. 北京: 国防工业出版社, 2008: 133- 457.
[3]	WEI Yu. Selected GPS receiver enhancements for weak signal acquisition and tracking[D]. Calgary: The University of Calgary, 2007.
[4]	沈锋, 李伟东, 李强. 基于I/Q 支路相干积分观测滤波的GPS 接收机信号跟踪方法[J]. 电子与信息学报, 2015, 37 (1): 37- 42.
[5]	ZIEDAN N I, GARRISON JL. Extended Kalman filter based tracking of weak GPS signals under high dynamic conditions[C]// ION GNSS 17th International Technical Meeting of the Satellite Division, 2004: 20- 31.
[6]	王熙贏, 陈熙源. 强跟踪滤波器在高动态 GPS信号跟踪中的应用[J]. 东南大学学报(自然科学版), 2014, 44 (5): 946- 951.
[7]	JEE GI, KIM H S, LEE Y J. A GPS C/A code tracking loop based on extended Kalman filter with multipath mitigation[C]// Proceeding of the 15th International Technical Meeting of the Satellite Division of the Institute of Navigation, 2002: 446- 451.
[8]	PISAKI ML, JUNG H. Extended Kalman filter methods for tracking weak GPS signals[C]// Proceeding of the 15th International Technical Meeting of the Satellite Divison of the Institute of Navigation, 2002: 2539- 2553.
[9]	李理敏, 龚文斌, 刘会杰, 等. 基于自适应扩展卡尔曼滤波的载波跟踪算法[J]. 航空学报, 2012, 33 (11): 1319- 1328.
[10]	张婧, 茅旭初. 基于平淡卡尔曼滤波的微弱信号跟踪算法[J]. 上海交通大学学报, 2007, 41 (11): 1834- 1838.
[11]	孙枫, 刘希斌. 一种快速跟踪的卡尔曼滤波算法及其在舰船组合导航中的应用[J]. 中国惯性技术学报, 2000, 8 (4): 20- 23.

Options

文章导航