Patent Document ID: 4616227
Application ID: 06630200
Patent Status: 1

Claim One:
1. In an image reconstruction system for reconstructing an image from data collected by a synthetic aperture radar carried by a flying object, a method of reconstructing a synthetic aperture radar image comprising: a first step of determining Doppler rate time change data as a space variant component in the azimuth direction from the orbit data of said flying object and from earth model data, a second step of determining coordinate transformation data of the image after range compression from said Doppler rate time change data so that said Doppler rate after said transformation is fixed; a third step of performing geometric transformation by resampling the pixel value of the image after range compression using said coordinate transformation data; a fourth step of executing compression processing of the image after said geometric transformation, in the azimuth direction using fast Fourier transformation; a fifth step of determining coordinate inverse transformation data by inverse geometric transformation of the image after azimuth compression to a coordinate system equivalent to that of an original image; and a sixth step of reconstructing the image by resampling the pixel value of the iamge after azimuth compression, using said inverse transformation data.