逆合成孔径雷达目标等效旋转中心估计

Rotating center estimation for inverse synthetic aperture radar imaging

在大的目标观测视角下,为抑制散射中心的越分辨单元徙动影响,获得高质量的逆合成孔径雷达(ISAR)目标成像结果,不仅需要目标的相对转动信息,而且需要估计其等效旋转中心。该文通过等分目标回波获取2幅距离-D opp ler图像,并在图像域跟踪3个散射中心的位置变化信息,提出了一种目标转速和等效旋转中心联合估计方法。同时,分析了若干影响该方法性能的因素,为方法的正确实施提供了指导。数值仿真实验表明了等效旋转中心估计的必要性和本方法的有效性。

The estimate of the rotational center of a rotating object is quite important when estimating the rotational velocity. This paper presents a method to suppress the affect of motion through resolution cells to provide well-focused imaging results for the target being imaged by inverse synthetic aperture radar （ISAR） with large aspect angles. The system forms two range-Doppler images by equally dividing all the received echoes, then estimates the rotational velocity and the rotating center by tracking the position changes of more than three scattering centers. Simulations demonstrate the necessity of the rotating center estimates and the effectiveness of the current method.