Wide Area Difference Calibration Algorithm Based on Virtual Reference Station for Tri-satellite TDOA Geolocation System
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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。
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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.
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表 1 仿真场景
名称 经度(°) 纬度(°) 高程(km) 辐射源 130.00 30.00 0.00 参考站1 120.00 40.00 0.00 参考站2 120.00 20.00 0.00 参考站3 140.00 35.00 0.00 参考站4 110.00 30.00 0.00 卫星1 100.00 0.00 35788.12 卫星2 110.00 0.00 35788.12 卫星3 140.00 0.26 35788.12 
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