SOLUTION AND PERFORMANCE ANALYSIS OF GEOLOCATION BY TDOA
SOLUTION AND PERFORMANCE ANALYSIS OF GEOLOCATION BY TDOA
复制标题
DOI：
10.1109/7.259534
复制
发表时间：
1993-10-01
影响因子：
4.4
通讯作者：
CHAN, YT
中科院分区：
文献类型：
--
作者：
HO, KC;CHAN, YT
一种地理定位方法是基于测量由四颗地球同步卫星中的三颗接收到的信号的到达时间差（TDOA）。对接收信号进行互相关以确定TDOA，并求解一组非线性方程以产生位置估计。对于三个或四个接收器的情况，推导出发射器位置的精确解。将该解决方案方法扩展到更多接收器是直接的。分析了系统的性能，给出了预测定位均方误差（MSE）和偏差的表达式，以及Cramer-Rao界。时差测量的精度和接收机与发射机之间的相对几何关系都影响定位精度。在偏差和均方误差公式中，几何因子充当TDOA方差的乘数。的几何因素对发射机的位置和卫星间距的依赖性的研究，以及仿真结果。
One method of geolocation is based on measuring the time difference of arrivals (TDOAs) of a signal received by three of four geostationary satellites. The received signals are cross-correlated to determine the TDOAs and a set of nonlinear equations are solved to produce the location estimate. An exact solution for the transmitter position is derived for the three or four receiver cases. Extension of the solution method to more receivers is straightforward. An analysis of the performance of the system is given, together with expressions for predicting the localization mean-square error (MSE) and bias, and the Cramer-Rao bound. Both precision in TDOA measurements and the relative geometry between receivers and transmitter affect the localization accuracy. The geometric factors act as multipliers to the TDOA variance in the bias and MSE formulae. A study of the dependency of the geometric factors on transmitter position and satellite spacings are provided, as well as simulation results.