TDOA定位技术的基本原理和算法

重点研究基于时间测量值的蜂窝无线定位算法。在分析现有无线定位技术和定位算法的基础上,本文选择了以到达时间差(TDOA)定位算法为研究重点。首先,介绍了两种比较典型的TDOA定位算法:CHAN算法和Taylor级数展开法。并在多种信道环境下对这两种基本定位算法进行了仿真比较。为了详细评价这两种算法的定位性能,本文在理想的信道环境和典型的实际信道模型(COST259和T1P1)下,研究了多种对算法定位性具有影响作用的参数,其中包括:蜂窝小区大小、参与定位基站的个数、测量设备的误差、信道中的NLOS误差等。

Principle and algorithm of TDOA location technology

This thesis researches the wireless location algorithms based on time-related measurements in the Wireless Cellular Network.By analyzing existing basic techniques and algorithms in wireless location,this thesis selects the TDOA algorithm for emphases of research.First,we introduce two typical algorithms as Taylor algorithm and CHAN algorithm.Furthermore,we analyze and compare them by simulation under some common mobile channel environment.In order to evaluate the performance of the two basic algorithms in detail,the perfect channel and two typical mobile communication channel model(COST 259 and T1P1) are employed for future detailed simulation.In simulations,many relative parameters which may effect the performance of the location algorithms are examined,such as the cell size,the number of the base stations taking part in the location service,equipment measurement errors,NLOS effect etc.