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逆合成孔径成像激光雷达是一种新型主动式有源成像系统,其优势就是可以获得比逆合成孔径雷达更高的分辨率,和更接近光学图片的效果。首先,对逆合成孔径技术的基本原理进行了描述。然后,对数据逆合成孔径激光成像雷达数据模型进行分析。再次,给出了一种基于时频分析的逆合成孔径激光成像雷达成像方法,该方法结合“CLEAN”技术,估计出回波数据的瞬时多普勒谱,利用了回波数据中的二次相位信息,得到瞬时多普勒图像,可以避免距离多普勒算法成像时由于二次相位引起的图像散焦,有效提高了图像质量。最后,实验数据证明了该方法的有效性。
Inverse synthetic aperture imaging lidar is a new type of active active imaging system, the advantage is that you can get higher resolution than inverse synthetic aperture radar, and closer to the effect of optical images. First, the basic principle of inverse synthetic aperture technique is described. Then, the data inverse synthetic aperture laser imaging radar data model is analyzed. Thirdly, an inverse synthetic aperture laser imaging radar imaging method based on time-frequency analysis is given. This method combined with the “CLEAN” technique to estimate the instantaneous Doppler spectrum of the echo data, The second phase information to obtain instantaneous Doppler images, which can avoid the image defocus caused by secondary phase when imaging from Doppler distance and effectively improve the image quality. Finally, the experimental data prove the effectiveness of the method.