宇航学报 ›› 2012, Vol. 33 ›› Issue (8): 1041-1047.doi: 10.3873/j.issn.1000-1328.2012.08.007

• 制导、导航与控制 • 上一篇    下一篇

基于卡尔曼滤波器的高动态GPS载波跟踪环

沈锋, 贺瑞, 吕东泽, 周宇   

  1. 哈尔滨工程大学自动化学院,哈尔滨 150001
  • 收稿日期:2011-04-28 修回日期:2011-06-20 出版日期:2012-08-15 发布日期:2012-08-22
  • 作者简介:10001328(2012)08104107
  • 基金资助:
    国家自然科学基金(61001154);中国博士后科学基金(20100480979)

Kalman Filter Based High Dynamic GPS Carrier Tracking Loop

SHEN Feng, HE Rui, LV Dong   

  1. College of Automation, Harbin Engineering University, Harbin 150001,China
  • Received:2011-04-28 Revised:2011-06-20 Online:2012-08-15 Published:2012-08-22

摘要:

为解决传统锁相环(PLL)在高动态环境下对全球定位系统(GPS)信号的跟踪精度问题,将自适应渐消滤波和二级卡尔曼滤波相结合研究了一种新的自适应二级卡尔曼滤波算法,并且提出了一种利用新息协方差计算渐消因子的方法,通过自适应渐消因子在线调节误差协方差矩阵补偿不完整信息的影响,使滤波器在系统模型不完整或者噪声统计特性不准确时仍接近最优。基于自适应二级卡尔曼滤波算法提出了一种高动态GPS载波跟踪环的设计方案。仿真结果表明,提出的方案较传统PLL的跟踪精度有显著提高,频率跟踪精度提高到 9.28Hz .



关键词: 高动态GPS, 二级卡尔曼滤波, 渐消因子, 自适应算法, 载波跟踪

Abstract: In order to solve the accuracy problem that the traditional phase locked loop(PLL) tracks the global positioning system(GPS) signal in the high dynamic environment , combining the adaptive fading Kalman filter with the two\|stage Kalman filter, this article studies a new adaptive two\|stage Kalman filter is studied in this paper, and proposes a method of calculating the fading factor according to innovation covariance is proposed to compensate the effect of incomplete information by on\|line adjusting of the error covariance through the fading factor, and ensure that the filter is optimal when the information of the system model and noise statistics is incomplete. A structure of high dynamic GPS carrier tracking loop is proposed based on adaptive two\|stage kalman filter. The simulation results show that this scheme have a obvious improvement of tracking accuracy compared with the traditional PLL, and the frequency tracking accuracy is improved to 9.28Hz .

Key words: High dynamic GPS, Two-stage Kalman filter, Fading factor, Adaptive algorithm, Carrier tracing

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