基于低轨单星的钟差修正定位方法  

Research on Clock Correction Positioning MethodBased on Low Earth Orbit Single Satellite

作　　者：苏佳[1] 靳晓会 易卿武 孙洪驰 SU JiaJIN Xiaohui;YI Qingwu;SUN Hongchi(School of Information Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;National Key Laboratory of Radar Single Processing,Xidian University,Xi’an 710071,China;State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang 050081,China)

机构地区：[1]河北科技大学信息科学与工程学院,石家庄市050018 [2]西安电子科技大学雷达信号处理全国重点实验室,西安市710071 [3]卫星导航系统与装备技术国家重点实验室,石家庄市050081

出　　处：《大地测量与地球动力学》2025年第5期482-487,共6页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2021YFF0603903)。

摘　　要：针对传统定位方法在单星情况下定位精度差、收敛速度慢、受钟漂影响较大的问题,提出钟差修正的伪距/多普勒联合定位模型,将钟差数学模型与伪距观测方程、多普勒观测方程结合,通过钟差数学模型与多普勒观测方程同时估测钟漂,消除接收机钟漂变化对定位精度的影响。在仿真场景下,对所提方法进行验证,结果表明,钟差修正的伪距/多普勒联合定位在不同工况下的最优定位精度可达219 m,相较于多普勒定位方法提升59.4%;伪距测量误差为1 m时,定位精度达169 m,收敛时间在300 s左右;频率测量误差为0.5 Hz时,定位精度在140 m左右。Aiming at the problems of poor positioning accuracy,slow convergence speed,and large influence of clock drift in the case of single-satellite positioning methods,a joint pseudo-ranging/Doppler positioning model with clock-difference correction is proposed,which combines the mathematical model of clock-difference with the pseudo-ranging observation equations and Doppler observation equations,and eliminates the influence of the change of the receiver’s clock-difference on the positioning accuracy through the simultaneous estimation of clock drift by the mathematical model of clock-difference and the Doppler observation equations.The proposed method is validated in a simulation scenario,and the results show that the optimal positioning accuracy of the pseudorange/Doppler joint positioning with clock difference correction can reach 219 m under different working conditions,which is 59.4%higher than that of the Doppler localization method;when the pseudorange measurement error is 1 m,the positioning accuracy can be up to 169 m,and the convergence time is around 300 s;when the frequency measurement error is 0.5 Hz,the positioning accuracy can be around 140 m.

关 键 词：低轨卫星 钟差修正 伪距 多普勒 

分 类 号：P228[天文地球—大地测量学与测量工程]