附有伪距电离层估计的实时精密单点定位方法  

Real-time precise point positioning method with pseudo-range ionospheric estimation

作　　者：贾恒杰 杨帆 杨英仪 崔宫 JIA Hengjie;YANG Fan;YANG Yingyi;CUI Gong(Shaoguan Power Supply Bureau of Guangdong Power Grid Co.Ltd.,Shaoguan,Guangdong 512000,China)

机构地区：[1]广东电网有限责任公司韶关供电局,广东韶关512000

出　　处：《导航定位学报》2023年第2期211-217,共7页Journal of Navigation and Positioning

基　　金：广东电网有限责任公司科技资助项目(030200KK52180046)。

摘　　要：针对现有实时精密单点定位(PPP)方法解算精度较低的问题,提出一种附有伪距电离层估计观测值P1ION的实时PPP方法:将无电离层(IF)组合及伪距电离层估计观测值(P1ION)相结合,并与传统的无电离层组合模型(IFPPP)和非差非组合模型(UC-PPP)进行对比和分析;然后,通过国际全球卫星导航系统服务组织(IGS)的最终精密产品评估法国空间研究分析中心(CNES)的实时数据流产品(CLK93),包括卫星轨道、钟差改正数和实时电离层产品。实验结果表明,全球定位系统(GPS)和伽利略卫星导航系统(Galileo)轨道和时钟改正精度优于格洛纳斯卫星导航系统(GLONASS)和北斗卫星导航系统(BDS);相对于IGS电离层联合分析中心(IAACs)最终全球电离层产品(GIM),不同分析中心的实时电离层产品垂直总电子含量(VTEC)估计的标准差(STD)和均方根(RMS)分别为1.9~2.3个总电子含量单位(TECU)和1.9-3.2 TECU;与IF-PPP和UC-PPP相比,附加实时电离层产品约束的IF-PPP+P1ION方法的定位精度在东(E)、北(N)、天(U)方向分别提高了14.0%、3.7%和11.2%。Aiming at the problem of low calculation accuracy for current precise point positioning(PPP)methods,the paper proposed a real-time PPP method of combining the conventional ionospheric-free(IF)code and phase with extra code ionospheric-estimated measurement(P1ION):the ionosphere-free(IF)combination and P1ION were integrated,and comparatively analyzed with the traditional ionosphere-free PPP(IF-PPP)and the uncombined PPP(UC-PPP);then the quality of Centre National d'Etudes Spatiales(CNES)real-time precise products(CLK93),including orbit,clock corrections and ionospheric products were evaluated by the final products of the International Global Navigation Satellite System Services(IGS).Experimental result showed that the orbit and clock correction accuracy of global positioning system(GPS)and Galileo satellite navigation system(Galileo)would be better than that of global navigation satellite system(GLONASS)and BeiDou navigation satellite system(BDS);and the standard deviation(STD)and root mean square(RMS)evaluated by the real time ionospheric product vertical total electron content(VTEC)of different analysis centers with respect to final global ionosphere map(GIM)products of Ionosphere Associate Analysis Centers(IAACs)could vary from 1.9 to 2.3 total electron content units(TECU)and 1.9 to 3.2 TECU,respectively;meanwhile,compared with IF-PPP and UC-PPP,the RMS of east(E),north(N),and up(U)components of IF-PPP+P1ION with real-time ionospheric constraints would be improved by 14.0%,3.7%and 11.2%,respectively.

关 键 词：精密单点定位(PPP) 电离层延迟 伪距电离层观测值 伪距电离层估计 

分 类 号：P228[天文地球—大地测量学与测量工程]