存在目标高度时平面三站时差定位精度分析

当目标高度比较大时，其对平面时差定位精度的影响已经不能忽略。本文分析了目标高度对距离差的影响情况，得出此情况下定位双曲线将向主辅站中垂线方向偏移的结论。并将定位方程在目标二维真实位置处作泰勒级数展开，获得定位误差向量与距离差变化情况的关系，在此基础上得到求解定位误差大小的表达式以及定位误差向量的方向向量的求取方法。最后结合随机定位误差分析得出总的定位误差表达式。仿真结果表明，定位精度分析结果与实际结果一致。

Precision Analysis in 2D Tri-station TDOA Location with Nonzero Object Height

When object height is large, its impact to 2D location precision in TDOA can not been neglected. The impact that object height brings to distance difference was analyzed, and the result was found that location hyperbola would deflect towards the perpendicular bisector of master station and assistance station. The location equation is expanded in Taylor series about the true object position, the insight relation between location error vector and distance difference error was found, based on this, the expressions that solve the location error and its direction vector were obtained. Eventually combining with random location error analysis the expression that solves total location error was obtained. Simulation results showed that the precision analysis is accurately consistent with the actual situation.