电讯技术2025，Vol.65Issue(5)：756-766,11.DOI:10.20079/j.issn.1001-893x.241127001
基于卡尔曼滤波的铱星信号多普勒跟踪方法与参数设计
Doppler Tracking Method and Parameter Design of Iridium Signal Based on Kalman Filtering
摘要
Abstract
To improve the positioning accuracy of low Earth orbit satellite navigation receivers,a Kalman-filtered Doppler tracking method that considers the characteristics of satellite motion and bursty signals is proposed.Utilizing Iridium as a case study,an adaptive adjustment algorithm for Kalman filter parameters is proposed with considering the highly dynamic characteristics and bursty structure of Iridium signals.It optimizes the filter noise covariance and other parameters by integrating Iridium orbital dynamics and receiver clock noise models.Additionally,it dynamically adjusts the parameters according to the carrier-to-noise ratio during tracking,thereby significantly enhancing the estimation accuracy of the Doppler frequency.Furthermore,the method enhances the Doppler frequency estimation accuracy during signal interruptions by iteratively predicting it according to the constraints of the historical estimation value.During the interruption of the burst signal,the Doppler frequency prediction provided by the Kalman filter is utilized to assist signal tracking,thereby improving the loop convergence speed.The results indicate that the error margin of the Doppler frequency deviation estimation is 9.29 Hz,which is 67.81％better than that of the fast Fourier transform(FFT)method.Furthermore,the prediction error of the Doppler frequency deviation during signal interruption is 13.12 Hz.In addition,the 2D Doppler positioning error reaches down to within 100 m,which is 54.6％better than that of the traditional FFT method.关键词
低轨卫星导航/铱星/多普勒频偏/卡尔曼滤波Key words
low Earth orbit satellite navigation/Iridium satellite/Doppler frequency/Kalman filter分类
信息技术与安全科学引用本文复制引用
陈小莉,朱溢涛,郭文飞,冯伟峻,田茂..基于卡尔曼滤波的铱星信号多普勒跟踪方法与参数设计[J].电讯技术,2025,65(5):756-766,11.基金项目
湖北省优秀中青年科技创新团队项目(T2022059) （T2022059）
