BHU-2D干涉综合孔径微波辐射计反演算法研究

Reverse Algorithm of BHU-2D Interferometric Synthetic Aperture Radiometer

BHU-2D干涉综合孔径微波辐射计是北京航空航天大学电磁工程实验室研制的一套10单元、T形阵列、8mm波段二维干涉综合孔径原理样机,文章针对其在实验室环境下的快速傅立叶变换(FFT)反演算法和G矩阵反演算法进行了计算机仿真。在FFT算法中,分析了校正残余误差对反演成像的影响;在G矩阵算法中,分析了成像距离误差和可视度测量误差对反演成像的影响。最后用BHU-2D干涉综合孔径微波辐射计对"U"形人造目标进行了实际成像,实验结果和仿真结果取得了较好的一致性,结果表明在BHU-2D干涉综合孔径微波辐射计中FFT反演算法比G矩阵反演算法具有更好的实用性和稳定性。

BHU-2D interferometric synthetic aperture radiometer is a two-dimensional radiometer prototype developed by Electro-Magnetic Engineering Lab of BeiHang University, it works at the 8mm wave band and consists of ten antennas and receiver elements arranged with T-shaped array. Aiming to image in the lab environment, computer simulation of FFT reverse algorithm and G-matrix reverse algorithm are carried out respectively . In the simulation, impact of calibration remainder errors in FFT reverse algorithm is analyzed, and impact of distance error and visibility measure errors in G-matrix reverse algorithm are analyzed. At last, image experiment of the U shaped man-made target is carried out. The experiment results are consistent with the simulation results, and show that in the BHU-2D interferometric synthetic aperture radiometer, FFT reverse algorithm is more practicable and robust than the G-matrix reverse algorithm.