一种二维干涉综合孔径辐射计近场成像算法

Near-filed imaging method of two-dimension interferometric synthetic aperture radiometer

提出了一种基于相位补偿的二维干涉综合孔径辐射计近场成像算法.从干涉综合孔径辐射计的成像原理和近场应用情况出发,分析了快速傅里叶变换(FFT,Fast Fourier Transform)反演算法在近场条件下存在的问题,并采用相位补偿的方法,提出了一种近场数值反演算法.对点目标用FFT算法和近场成像算法进行了成像仿真,仿真结果表明近场成像算法比FFT算法具有更高的空间分辨率.用一套8 mm波段二元干涉综合孔径辐射计对人工双点源场景进行了成像实验,实验结果证明了该近场算法的有效性.

A near-field imaging method of two-dimension interferometric synthetic aperture radiometer was presented. Based on the principle of the two-dimension interferometric synthetic aperture radiometer and the near-field condition, the shortcomings of FFT（fast Fourier transform） imaging method were analyzed, and a near-filed numerical imaging method by phase compensating was proposed. The imaging simulation of single point-target by FFT reverse algorithm and the near-filed reverse algorithm were carried out respectively. The simulation results show that the near-filed reverse algorithm has better resolution than FFT reverse algorithm. The imaging experiment of two separate man-made points with these two methods was accomplished, and the experiment results prove that the near-field imaging method is valid.