孙正波
盲信号处理重点实验室 ??成都 ??610041
基金项目:国家自然科学基金(61304264)
详细信息
作者简介:任凯强：男，1989年生，博士生，研究方向为无源定位、误差校正和信号处理
孙正波：男，1975年生，高级工程师，研究方向为无源定位、参数估计等
通讯作者:任凯强 rkq308597871@126.com
中图分类号:TN91计量
文章访问数:1306
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被引次数:0
出版历程
收稿日期:2018-03-20
修回日期:2018-11-12
网络出版日期:2018-11-19
刊出日期:2019-02-01
Wide Area Difference Calibration Algorithm Based on Virtual Reference Station for Tri-satellite TDOA Geolocation System
Kaiqiang REN,,Zhengbo SUN
Science and Technology on Blind Signal Processing Laboratory, Chengdu 610041, China
Funds:The National Natural Science Foundation of China (61304264)
摘要
摘要:星历误差是导致同步三星时差定位系统定位误差的主要因素，该文针对传统差分校正算法在远离参考站区域对星历误差校正精度差的问题，提出一种基于虚拟参考站(VRS)的广域差分校正算法。首先证明两参考信号时差的差分残差近似为两参考站连线方向的线性函数；然后利用已有参考站的位置信息和参考信号的时差观测值，在目标辐射源位置处通过线性拟合构造一个VRS；最后将目标辐射源与VRS的时差观测值进行差分，从而实现对星历误差的高精度校正。仿真结果表明，相比传统差分校正算法，该方法可大范围消除星历误差对同步三星时差定位系统定位精度的影响，且定位精度可逼近CRLB。
关键词:同步三星时差定位系统/
星历误差/
差分校正/
虚拟参考站
Abstract:A wide area difference calibration algorithm based on Virtual Reference Station (VRS) for tri-satellite Time Difference Of Arrival (TDOA) geolocation system is proposed to solve the problem that traditional difference calibration algorithm can not eliminate the location error caused by ephemeris error completely, especially when the emitter source is far away from the calibration station. Firstly, TDOA measurements of the VRS, which is in the vicinity of emitter source, is estimated by using TDOA measurements of reference station. Then, in order to remove the effect of ephemeris error and synchronization error on location error, TDOA measurements of the VRS is subtracted from that of emitter source. Simulation results demonstrate that the proposed algorithm can almost eliminate the effect of ephemeris error on location error of tri-satellite TDOA geolocation system in wide area.
Key words:Tri-satellite Time Difference Of Arrival (TDOA) geolocation system/
Ephemeris error/
Difference Calibration (DC)/
Virtual reference station
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