基于多普勒频谱相关的加速运动目标ISAR成像

ISAR imaging of accelerating targets based on Doppler spectrum correlation

针对具有较大加速度的机动目标使传统平稳目标逆合成孔径雷达(inverse synthetic aperture radar,ISAR)成像算法失效的情况,提出了一种基于多普勒频谱相关的加速目标ISAR成像算法。该方法通过多普勒频谱相关消除加速度引起的方位二次相位散焦,并根据回波的能量分布,通过门限设置自适应地抑制多线性调频分量信号处理时产生的交叉项。最后,仿真以及实测数据的成像结果证明了该算法的有效性。

The acceleration of maneuvering targets can make the traditional inverse synthetic aperture radar （ISAR） imaging algorithm invalid. An effective ISAR imaging algorithm for these targets is proposed. The second-order phase terms caused by the acceleration are eliminated via correlation in the Doppler spectrum. To suppress the cross-terms of multi-component linear frequency modulated （LFM） signals, an adaptive correlation algorithm is presented by setting proper threshold values. Finally, the simulation and imaging results of measured data prove the validity of this algorithm.