双站测向与测时差组合定位精度分析

Analysis of Coordinated Positioning Accuracy of Two Passive Radars

针对无源雷达测向与测时差组合定位问题,提出一种利用前者量测结果为后者构建假量测点和协方差的新方法,并采用凸组合法对测向与假量测结果进行融合,得出综合定位精度的分布。仿真结果表明,该方法能够有效地利用两种完全不同的量测数据,提高目标的定位精度,同时给出的GDOP理论值可以真实反映组合量测的性能,具有一定的应用价值。

Aimming at the coordinated positioning problem of passive radar measurements including target azimuth and time difference of arrival （TDOA）, a new algorithm of constructing a TDOA pseudo-measurement and its covariance by using the azimuth measurements is proposed. The geometric dilution of positioning （GDOP） accuracy is then derived from a weighted least square estimation between the TDOA pseudo-measurement and the azimuth measurements. The computer simulation shows that the algorithm can use two widely different measurements effectively and improve the target location precision greatly. Moreover, the theoretical GDOP can well represent the actual performance of such coordinated positioning system. It has some applied value in the future.