After introduced the current research situation in this field , the advantages and disadvantages of tdoa location is discussed in the chapter one , which illustrated the widely practical prospect of tdoa location . in the chapter two of this paper , the tdoa extraction technology used for continual - wave signal is discussed 论文首先对无源定位特别是无源时差定位技术的国内外研究现状进行了论述，分析了时差定位方法相对于其它定位方法的优缺点，说明时差定位方法在各个领域具有广泛的应用前景。
Time difference of arrival ( tdoa ) location system , namely the hyperbola location , is an important passive location method . using the time difference of signals arrived to three or more different stations , we can determine the position of the target wanted to be located . because of its high precision and fast location advantages , it is widely used in practice . but its precision depends on time delay estimation , so researching fast and exact time delay estimation method become a hot topic in tdoa location system 无源时差定位又称为双曲线定位,是一种重要的无源定位方法,它通过处理三个或更多个接收站采集到的信号到达时间数据,从而对辐射源进行定位。时差定位系统具有精度高、定位快等优点,在工程中得到了广泛的应用。但是时差定位系统的精度主要取决于时延估计的精度,因此,研究快速、准确的时延估计方法成为时差定位系统中一个十分重要的课题。
The study in this paper based on the national fifteen tackling key problem - " life detection and orientation of earthquake emergency response system " and project of no . 10 research institute of china electronics technology group corporation - " pulse radar target detection and location technology " , has completed the study and simulation of the relative technology of tdoa , which was a theoretical and technological supporting to the two projects 本论文在国家十五重点科技攻关课题“地震救助生命搜索与定位技术研究”和中国电子科技集团第十研究所“脉冲辐射源监测和定位技术”国际合作项目中，完成了对其中时差定位相关技术的研究和仿真，为工程项目的实施提供理论和技术支持。
The localization of mobile object is accomplished by nonlinear kalman filter . based on the formulae of localization errors , the rules are analyzed , which describe the relationship between the localization precision and the constellation factors , such as constellation shape , the height of satellite . the method to design the constellation is presented with the help of these rules 论文利用非线性kalman滤波设计了三星时差定位星座对运动目标的定位定速算法；根据定位误差的解析公式，利用仿真方法分析了三星时差定位星座的星座构型和卫星高度等因素对定位精度的影响规律，并依据定位精度影响规律，研究了三星时差定位星座的星座设计问题。
