基于Forman法对遥感干涉图像进行相位校正的改进

相位误差的校正是傅立叶变换光谱仪器计算处理中的重要环节,Forman法是常用的校正方法之一.针对Forman法运算量大、实时性差的缺点,提出了对它的计算过程进行改进的方法.在分析Forman相位校正算法的基本原理和运算流程的基础上,充分运用傅立叶变换和卷积的性质,简化了计算过程,有效的提高了计算效率.重点研究了算法改进的方法和途径,并给出了其流程.最后,估计了改进前后方法的运算量和处理时间的对比.

A Improved Algorithm for Correction of Remote Sensing Interferograms based on Forman Method

The correction of phase error is an important step in the calculation of Fourier Transform Spectrometer in order to de- rive spectrum from asymmetry interferogram. The method given by Forman is one of those normally used correction methods. Based on the theory and procedure of Forman method,an improved algorithm is obtained by applying the quality of Discrete Fourier Transform as well as convolution. With simplified computing process,it provides a possible solution to the disadvantage of huge calculation and poor real- time operation of the original method. The approach of improvement is studied in detail with the flow illustrated. At the end,the compari- son of computation time between the two methods is given,which demonstrates higher efficiency of the improved one.