空间四站时差定位中的模糊及无解研究

将平面三站时差定位的基本原理加以推广，应用于空间四站时差定位系统中出现的模糊和无解现象的研究。根据仿真结果，找出了模糊分布与测量站布局之间的关系，提出了排除部分模糊区的方法；同时对无解产生的原因加以分析，并讨论了在无解情况下的次优定位方法。空间时差定位系统因其复杂性，比平面定位系统更容易出现模糊现象。因此，在设计各测量站的布局时，应当结合本文的分析和讨论，将所需的可控区设置在模糊区和无解区之外。

Study on the Ambiguity and Non-Solution of 4-Station TDOA Space Location Systems

This paper extends the theory of 3 -station 2D TDOA location, in order to apply it in space 4 -station TDOA location system to deal with its possible ambiguity and non - solution phenomena. With the help of simulation results, the relation between the distribution of ambiguity and measure stations is found, and the methods to eliminate part of the ambiguity are also presented. Meanwhile, the reasons to produce non - solution are analyzed, and the next -to -best location method under non -solution conditions is discussed. Because of its complexity, space TDOA location tends to produce ambiguity more easily compared with 2D TDOA location. Therefore, in the design of the distribution of stations within such a system, the controllable area must be set out of the area of ambiguity and non - solution, according to analysis and discussion in this paper.