基于差波束逆合成孔径雷达成像的角运动参数估计方法

Angle Motion Parameters Estimation Based on Inverse Synthetic Aperture Radar Imaging for Difference Beam

针对单脉冲三维成像时的目标角运动估计问题,提出一种基于差波束逆合成孔径雷达成像的新的角运动参数估计方法.该方法利用了各阶运动参数对差波束回波谱宽度的不同贡献以及熵与谱宽度的关系,通过最大熵和最小熵分别对0阶和1阶以上角运动参数进行搜索,得到全局最优估计.有别于传统比幅测角方法,所提方法通过全局搜索得到目标的角运动参数,可以较好地抑制角闪烁的发生.对飞机目标角运动参数估计过程的仿真结果表明,与传统高分辨测角方法相对比,所提方法的平均误差降低了72%.

Aiming at the problem of angle motion estimation in monopulse three-dimension imaging, a novel angle motion parameters estimation method based on the inverse synthetic aperture radar imaging for difference beam is presented. Using the relation between spectrum width and entropy and the different contributions devoted by each angle motion parameter to the echo spectrum width of the difference beam, the global optimal estimation is obtained through searching the angle motion parameters of zero and higher order via max-entropy and min-entropy respective ly. Compared to the conventional amplitude-comparison angular estimation method, the proposed method can suppress the angle glint better since the angle motion parameter of target is obtained by global searching. Simulations show that the average error of the proposed method is reduced 72 % of the traditional method.