太赫兹CSAR运动目标距离速度估计与重定位方法

A range velocity estimation and relocation method for ground moving targets of terahertz CSAR

摘要:

圆周合成孔径雷达(CSAR)中，由于雷达平台绕观测场景圆周飞行，雷达和地面目标之间的距离方程复杂，目标的距离向参数和方位参数之间有复杂的耦合关系，导致单独估计动目标距离向速度参数的难度加大。提出一种基于子孔径分解的太赫兹CSAR运动目标距离向速度估计方法，选择合适的子孔径角度，对CSAR进行子孔径分解，在子孔径条件下，通过小角度近似，可以实现运动目标距离向速度和其他参数间的解耦合，准确估计运动目标的距离向速度，实现运动目标的精确重定位。仿真和实测数据验证了该算法的有效性。

Abstract:

In Circular Synthetic Aperture Radar(CSAR), the range equation between radar and ground moving target is complicated because the radar platform flies around the circumference of the observation scene, and there is a complex coupling relationship between range direction parameters and azimuth direction parameters of target, which makes it difficult to estimate the range velocity of moving target independently. A method for estimating the range velocity of moving target in terahertz CSAR based on sub-aperture division is proposed. By selecting a suitable angle of sub-apertures, sub-aperture division is performed on CSAR. Under the condition of sub-aperture, the decoupling between the range velocity of moving target and other parameters can be realized by small angle approximation, and the range velocity of moving target can be accurately estimated, which can achieve accurate relocation of moving target. The effectiveness of the proposed algorithm is verified by simulation and measured data.