转角速度矢量估计和三维ISAR成像

Angular Velocity Vector Estimation and Three Dimension ISAR Imaging

逆合成孔径雷达成像中,观测目标通常具有明显的几何特性,且随目标转角的变化,其在成像平面的投影也随之变化。提出了利用Radon变换估计线性几何目标在各次"快照"的变化位置,估计雷达视线角和转角速度的方向,并对其三维位置和二维ISAR像建立映射关系,获得三维图像。由于Radon变换对直线检测具有很强的鲁棒性,该文的方法在已知目标转角模值的条件下对转角方向实现高精度估计,在此基础上可以对线性几何目标实现三维重构。仿真结果验证了算法的正确性。

In inversed synthetic aperture radar images,the observed targets usually consist of some dis-tinctive geometric parts.The images of these parts in the image plane rotate with the varying rotation angle between target and radar.In this paper,a technique to estimate the directions of line of sight and rotation an-gular velocity is proposed.Based on detecting the location difference of linear geometry of the target ob-served,both the directions and the location parameters of the linear geometry can be solved.Subsequently,the mapping relationship between the two dimensional ISAR image and the three dimensional location can be built.Because of the precision and preponderance in linear estimating of Radon transform,the technique is ef-fective.Numeric simulation result proves the validity of the presented approach.