历元自差分的伪距定位算法  

Single point positioning based on self-difference method

作　　者：沈文波 蔡成林 曾武陵 万刚远 SHEN Wen-bo;CAI Cheng lin;ZENG Wu-ling;WAN Gang yuan(College of Information and Communication,GuiLin University of Electronic Technology,GuiLin 541004,China;School of Information Engineering,Xiangtan University,Xiangtan,411105,China;School of Network and Information Security,Xi'an University of Electronic Technology,Xi'an,710126.China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]湘潭大学信息工程学院,湖南湘潭411105 [3]西安电子科技大学网络与信息安全学院,西安710126

出　　处：《微电子学与计算机》2020年第4期7-11,共5页Microelectronics & Computer

基　　金：国家自然科学基金项目(61771150);广西重点研发计划项目(AB17129028);湖南省科技创新计划项目(2018GK2014);湖南省科技创新计划项目(2018RS3089);桂林电子科技大学研究生教育创新计划项目(2019YCXS033)。

摘　　要：针对单频伪距单点定位误差消除不干净,特别是电离层误差难以消除的问题,本文分析了伪距误差的组成,提出了利用误差的时间相关性来消除误差的历元间自差分法.针对广播星历误差大,精密星历不实时等问题,本文通过IGS提供的广播星历改正信息,实时修正广播星历得到的卫星位置偏差和钟差的偏差.本文分析了历元间自差分法的特点,得知历元间隔、初始点精度对其影响大,并用实测数据验证了这一观点.另外,通过与传统的单频伪距单点定位对比,可知在1秒历元间隔时,三维定位精度在1.2米左右,定位精度大幅提高.The error of single point positioning by single-frequency pseudorange is hard to eliminate,especially the ionospheric error does.In order to eliminate those errors,this paper analyzes the composition of the pseudo-range error and proposes the self-differential method between the epochs using the time correlation of the errors to eliminate them.In view of the problems of large broadcast ephemeris error and precise ephemeris not real-time,this paper corrects the satellite position deviation and the deviation of the clock difference obtained by the broadcast ephemeris,through the broadcast ephemeris correction information provided by IGS.In this paper,the characteristics of the self-differential method between epochs are analyzed.It is found that the epoch interval and the initial point precision have great influence on it,and the viewpoint is verified by the measured data.In addition,by comparing with the conventional single-frequency pseudo-single point positioning,it can be seen that the three-dimensional positioning accuracy is about 1.2 meters at a time interval of one second,and the positioning accuracy is greatly improved.

关 键 词：伪距单点定位 历元间自差分 伪距误差 广播星历误差 历元间隔 

分 类 号：P228.1[天文地球—大地测量学与测量工程]