基于椭球模型的超视距时差定位精度分析  

Positioning accuracy analysis of the over-the-horizon TDOA based on ellipsoid model

作　　者：王翔 周晨[2] 李江 张冬亮 WANG Xiang;ZHOU Chen;LI Jiang;ZHANG Dongliang(School of Computer and Information Engineering,Hubei University,Wuhan 430062,China;Department of Space Physics,Wuhan University,Wuhan 430072,China;China Electronics Technology Group Corporation No.10 Research Institute,Chengdu 610036,China)

机构地区：[1]湖北大学计算机与信息工程学院,武汉430062 [2]武汉大学空间物理系,武汉430072 [3]中国电子科技集团公司第十研究所,成都610036

出　　处：《导航定位学报》2021年第6期71-76,共6页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41704155);中国博士后科学基金项目(2017M622504,2019T120679)。

摘　　要：对流层散射能够实现无线电波的超视距传播。通过目标源信号经过对流层散射到达3个不同探测站的时间差的精确测定,可以实现目标源的高精度定位。为了分析对流层超视距散射三站时差定位精度,给出了基于地球椭球模型的超视距时差定位原理,建立了对流层散射超视距三站时差定位的误差方程,分析了3个不同探测站和散射体位置分布对目标源定位精度的影响。分析结果显示,三站间时差测量误差显著影响定位精度,而三站的站址测量误差和散射体位置误差对超视距定位精度的影响不明显,站站间的基线长度和站型分布对定位精度的分布有显著影响。Troposcatter supports the over-the-horizon propagation of the radio waves.Three detecting stations can passively measure the Time Difference of Arrival(TDOA)of the scattered signal by the troposphere from the target station.Based on WGS84 model,the three stations TDOA can accurately position the target signal.The purpose of this paper is analysis of positioning accuracy by the troposcatter over-the-horizon three-station TDOA in ellipsoid model.In this paper,positioning equations of the three-station TDOA with WGS-84 are analyzed.Geometric Dilution of Precision(GDOP)are calculated and presented.The GDOP results demonstrate that the measurement tolerance of time significantly affects GDOP,whereas the measurement tolerance of station positions and scatters position do not considerably influence the GDOP.The distance of the detecting stations and the topology of the three stations fairly impact on the topology of the GDOP.

关 键 词：对流层散射 椭球模型 超视距探测 三站时差定位 几何精度因子 

分 类 号：P228[天文地球—大地测量学与测量工程]