摘要三星时差定位体制的原理是利用三颗卫星接收某一辐射源发射的信号，测量信号到达三颗卫星的时间差，确定两个独立的等时差双曲面，再加上地球面的约束，实现对辐射源的实时精确定位。67256

本课题主要讨论三星时差定位系统的定位算法和解时差配对模糊的方法。本文首先讨论了三星时差定位的两种算法——牛顿迭代法和最小二乘迭代法的原理和算法流程，再用MATLAB对这两种算法进行仿真，发现牛顿迭代法定位时间较短、复杂度较低，而最小二乘法则对初值较灵敏。为能有效消除高重频信号的配对模糊，本文接着对利用时差相关性的时差分选配对方法进行了仿真研究。最后，结合时差配对所得结果和两种定位算法，对时差分选配对算法做了改进，将所有可能的时差对代入牛顿迭代法定位得到辐射源位置，选取其中具有最小代价函数值的时差对作为真实配对，从而进一步排除了虚假时差对对三星时差定位性能的影响和干扰。

毕业论文关键词  三星时差定位  牛顿迭代法  最小二乘法  配对模糊  时差相关性

毕业设计说明书（论文）外文摘要

Title       Vague Pairing Suppression Technology in  Three-star Passive TDOA Location System              

Abstract

Three-star location system uses three satellites to receive signals emitted by a radiation source, and measures the time of arrival of the signals, then determines two hyperboloids of time lag, and achieves 

real-time precise location with the restriction of bound on the surface of the earth. 

The main research goals of the subject are positioning algorithm of three-star time-difference location system and vague paring suppression technology. Firstly, the article discusses the principle and iterative process of two time-difference location algorithms- Newton iterative method and least squares iterative method, then simulates the two algorithms with MATLAB, finding that Newton iterative method converges faster and has less complexity, but least squares method is sensitive to the initial value. To effectively eliminate the vague pairing of high-repetition-rate signal, the article simulates the sorting and pairing method using time difference correlation of TDOAs. Finally, the article integrates the result of time-difference pairs and the two location algorithm. The results of time-difference pairs are put into Newton iterative method for location estimation, and choose the time-difference pairs with the least cost function values as real. The method further excludes the interference of false time-difference pairs on the performance of three-star TDOA location.

Keywords  Three-star TDOA location   Newton iterative method        least squares iterative method   vague pairing   time difference correlation

目  录

第一章  绪论 1

1.1  无源定位技术概述 1

1.2  三星时差定位体制概述 1

1.3  当前发展现状 2

1.4  本课题的主要工作及章节安排 3

第二章  三星时差定位及时差配对模糊原理 4

2.1  时差定位坐标系 4

2.2  TDOA定位原理 6

2.3  高重频信号配对模糊的产生原理[9] 8

第三章  三星时差定位算法仿真分析