三星时差定位系统的多时差联合定位方法

摘要

Location precision of radiant source is the primary performance of passive location system, and how to improve location precision is an important problem which always attracts attention. In three satellites Time Difference Of Arrival (TDOA) passive location system, location precision of single pulse location is limited by the error of TDOA measure. For improving location precision of radiant source, multi-TDOA location algorithm which estimates the position of target combining all the TDOAs is proposed in this paper. The new algorithm calculates three satellites’ positions at the arrival time of each pulse firstly, and then combines all pulses’ TDOA equations and earth equation, lastly estimates the position of radiant source using least square algorithm. The result of simulations shows that the new algorithm can improve location precision of radiant source, and it is a steady and effective location method with higher location precision.%　　辐射源的定位精度是无源被动定位系统重要的性能指标，如何提高定位精度也是一直被关注的重点问题。在三星时差定位系统中，由于时差的测量精度有限，单脉冲时差定位的精度受到限制。为了提高辐射源定位精度，该文提出一种多时差联合定位方法，即综合利用多个脉冲的时差进行定位。该方法首先计算每个脉冲到达时刻的三星位置，然后联立所有脉冲的时差方程及地球方程，利用非线性最小二乘方法估计辐射源的位置。仿真结果表明该方法能够提高辐射源的定位精度，是一种定位精度比较高的、稳定而有效的定位方法。