一种适合逆合成孔径激光雷达的成像算法

摘要

逆合成孔径激光雷达是主动式有源成像雷达，能够实现高速运动物体的实时高分辨成像。但传统R-D算法很难得到目标的二维高分辨图像。提出一种适合逆合成孔径激光雷达成像的算法，通过时频分析法分析逆合成孔径激光雷达的回波信号特征，对光外差探测后的回波信号进行重排Wigner分布和Radon变换的处理，估计出目标的运动速度，通过构造有效的补偿因子，实现对目标的二维高分辨率成像。通过仿真实验得到了分辨率更高的图像，验证了此方法的有效性。%Inverse synthetic aperture laser radar is an active imaging radar; and the real-time imaging of moving target can be achieved in ultra-high resolution. Two-dimensional high-resolution images can’t be obtained by the traditional R-D algorithms. An Imaging algorithm for Inverse synthetic aperture laser radar is proposed in this paper. Characteris-tics of the echo signals are analyzed through the form of time-frequency analysis,then Wigner distribution and the Ra-don transform of detected echo signals are reset. After that, the speed of the moving target is estimated and through constructing an effective compensation factor, two-dimensional high-resolution imaging of the moving target are real-ized. High-resolution images are obtained by the simulation experiment and the effectiveness of this method is proved.