适用于非合作照射源的无源雷达运动目标成像方法

Moving target imaging method for passive radar applicable to non-cooperative illumination sources

针对运动目标的无源雷达成像,给出一种采用分布式接收孔径的成像方法。首先建立运动目标的回波信号模型,该模型无需任何发射源先验信息。而后基于分布式孔径接收到的回波数据稀少,以目标位置和速度为未知量采用广义似然比检验的方法进行成像,完成成像区域内运动目标的成像和速度估计。最后以WiMAX信号作为机会照射源进行仿真分析,结果表明所用方法能够有效实现无源雷达动目标成像。

An imaging method that uses the distributed apertures for passive radar imaging of moving tar gets is presented. First of all, we present the signal model of the moving targets, which does not require any information of the transmitting sources. Then, due to the limited number of received signals obtained via the dis tributed apertures, we formulate the imaging problem as a generalized likelihood ratio test （GLRT） with unknown target position and velocity and complete the target imaging and velocity estimation by applying the GLRT at each possible position and velocity. Finally, we perform simulations using the worldwide interoperability for microwave access （WiMAX） signals as an illuminator of opportunity and demonstrate the effectiveness of the proposed method.