综合孔径辐射计反演成像算法研究

Image Reconstruction and Inversion Algorithm of Synthetic Aperture Radiometer

高效的反演成像算法是综合孔径辐射计成像的关键技术之一。提出一种基于视场细分的改进反演成像算法,将视场细分成多个矩形子区域,利用反演亮温与可视度函数的傅里叶变换关系,得到每个子视场的反演亮温。通过理论证明和仿真计算表明:该算法可使系统中未消除的误差分量对亮温反演的影响最小,与常用的BG算法对比分析:表明了新算法的正确性和有效性,且计算速度快。

High efficiency image reconstruction and inversion algorithm is one of the key technologies for synthetic aperture radiometer. An improved method using subdivision of viewport is proposed for image reconstruction and inversion, in which the viewport is fractionized to a number of sub-viewport of rectangle areas in the algorithm, and the brightness temperature of sub-viewport is retrieved with method of Fourier transform relation between brightness temperature and Visibility Function. The theoretical proof and simulation analysis show that the effects of unavoidable system errors on image reconstruction and inversion are minimized by this method. Comparing with the BG algorithm indicates the validity and effectiveness of the new algorithm, and the computing speed is faster.