多站时差定位性能试验评估技术

本文给出时差定位系统相关法时差测量误差模型,并以此为基础,建立了多站(大于3)时差定位性能试验评估方法.首先,给出了多站时差定位误差模型.其次,引入了信噪比对时差测量影响因素,提出了时差定位系统的相关法综合时间测量误差参数化模型.第三,给出了基于最小二乘法的综合时间测量误差参数估计方法,估计出综合系统参数和时间测量误差常数项.第四,给出了多站时差定位误差等效推算方法,该方法能够根据单条试验航线的时差定位数据,推算综合时间测量误差参数,进而获取任意位置的定位误差.最后进行了仿真验证,表明本文提出的时差定位性能试验评估方法优于传统固定时差测量误差模型定位性能试验评估方法.

Performance test and evaluation technology for multi-station TDOA location system

The time difference measuring error model of time difference of arrival (TDOA) location system is given, based on which performance test and evaluation technology for multi-station TDOA (more than 3) location system is established. Firstly, multi-station location error model is offered. Secondly, the signal noise ratio (SNR) is introduced into time difference influencing factor, and the integrated time measure error parameterized model of correlation method for TDOA location system is proposed. Thirdly, the integrated time measure error parameter estimation based on least square method is introduced to get synthetic system parameter and constant term of time measure error. Fourthly, location error equivalently reckoning method for multi-station TDOA system is presented, and this method can reckon the integrated time measure error parameter based on TDOA location test data of design airline, further to reckon positioning accuracy of arbitrary base station and source position. In the end, simulation results verify this theory, and show that this method excels the test and evaluation method of traditional fixed time difference measure error model.