低轨双星无源探测系统对运动辐射源的快速检测算法

摘要

A method for emitter locating and motion detecting is proposed for low earth-orbit( LEO) dual-satellite passive detection system which is unable to locate fast moving emitters when using time difference of arrival( TDOA) and frequency difference of arrival( FDOA) . Motion detection is implemented automati-cally using FDOA measurement and location result based on angle of arrival ( AOA ) measurement and TDOA measurement with single observation of the emitter. The algorithm can efficiently detect uniformly moving targets which move parallelly to the geodetic level even if measurement errors exist. Numerical sim-ulation demonstrates that the correct detection probability reaches 95% when emitters move faster than 60 m/s in LEO dual-satellite passive detection system.%针对时频差体制的低轨圆轨道双星无源探测系统不能对运动辐射源进行定位和辐射源是否运动进行判别问题，提出了一种通过单次观测实现运动辐射源定位与运动性判别的快速算法。该算法利用信号到达角与信号达到时差联合定位结果，结合信号到达频差对平行于大地水准面的匀速运动目标进行运动性检测，使系统在观测量存在误差条件下仍能有效进行目标运动性判别。将其应用到低轨双星无源探测系统中，仿真结果表明算法对速度大于60 m/s以上的辐射源具备优于95%的正确检测概率。