高程信息辅助的地面辐射源时差定位方法

摘要

This paper proposed a modified iterative algorithm using TDOA measurements, for estimating the location of an unknown altitude source with the introduction of digital elevation model ( DEM). The proposed algorithm, with the constraint of the WCS-84 oblate spheroid earth model which can be modified at each iteration till convergence, could produce a more accurate source location estimate. The introduction of DEM effectively reduced the deg-radation of localization accuracy of an unknown altitude source. The theoretical analysis shows that the performance of the proposed algorithm surpasses that of the others. The simulation results indicate that it is computationally efficient and significantly improves the source location accuracy. With this algorithm, the localization accuracy of an unknown altitude source on the land approaches that of a source on sea level.%研究不同卫星接收同一辐射源时差对地面辐射源定位优化问题,针对高程的影响将导致定位精度恶化.为了消除高程的影响,使得对高程未知的地面辐射源定位的精度达到对海平面上辐射源定位的精度,提出了运用高程信息动态修正WGS -84地球模型进行辅助定位的算法.算法提出并使用了高程信息动态修正WGS - 84地球模型的思想,通过高程信息的引入快速准确地修正了WGS -84地球模型,有效抑制了地面辐射源高程未知导致的定位精度恶化.理论分析表明该算法的性能优于常规的时差定位算法,仿真证实了改进算法实现定位精度高,为设计提供有效参考.