一种基于伪距的罗兰C定位授时解算方法  

A solution method of positioning and timing based on pseudo distance assigning for Loran-C

作　　者：燕保荣[1,2] 李云[1,2] 郭伟[1,2] 华宇[1,2] YAN Bao-rong;LI Yun;GUO Wei;HUA Yu(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院精密导航定位与定时技术重点实验室,西安710600

出　　处：《时间频率学报》2020年第2期130-142,共13页Journal of Time and Frequency

基　　金：国家自然科学基金青年科学基金资助项目(11803040);中国科学院前沿科学重点研究资助项目(QYZDJ-SSW-JSC034)。

摘　　要：传统罗兰C定位解算方法受台链限制,测量的时延差中相关误差难以分离,鉴于此提出了一种基于伪距的定位授时解算方法。该方法以伪距观测量的基本构成为基础,对椭球面大地线距离进行线性化处理后再进行迭代计算。仿真计算结果表明:当测量伪距中不包含观测误差时,该方法能够实现椭球面的高精度定位授时。通过对实际传播路径上测量伪距的仿真,分析了随机噪声和二次时延等观测误差对定位及授时的影响。结果显示:与二次时延等误差相比,随机噪声对定位及授时准确度的影响并不明显,主要影响定位及授时的稳定度,而二次时延等误差则主要影响其准确度。伪距定位授时算法不受台链限制,误差源清晰,易于后期分离。综合本文分析可以得出:减少伪距观测值中二次时延等误差的影响,抑制随机噪声,可以有效提高罗兰C系统定位及授时的精度。The traditional Loran-C localization method is limited by the station chain,and it is difficult to separate the correlation errors from the measured delay difference.In view of this,a new method of positioning and timing based on pseudo distance is proposed.Based on the basic structure of the pseudo-range observation amount,the method linearizes the ellipsoidal geodesic distance and then computes it iteratively.The simulation results show that this method can realize the precise positioning and timing on the ellipsoidal sphere when the measurement error is not included.By simulating the measurement of pseudo distance on the actual propagation path,the influence of random noise and secondary delay observation error on the positioning and timing are analyzed.The results present that the effect of random noise on the accuracy is not obvious compared with the errors of secondary delay.The stability of positioning and timing is mainly influenced by the random noise,while the accuracy is mainly affected by the errors of secondary delay.Pseudo-range positioning and timing algorithm is not limited by the table chain,and the errors are easy to be separated later.Based on these analysis,it can be concluded that the accuracy of positioning and timing by Loran-C system can be improved effectively by reducing the influence of the secondary delay and reducing the random noise.

关 键 词：罗兰C 定位 授时 迭代算法 

分 类 号：P228.4[天文地球—大地测量学与测量工程]