SYNTHETIC APERTURE RADAR DEVICE AND IMAGE REPRODUCING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To heighten accuracy in estimating the phase compensation quantity to obtain an image improved in resolution by suppressing the error of image correlation caused by speckle noise. SOLUTION: This synthetic aperture radar device is provided with a transmit-receive antenna 1; a wide-band transmit-receive part 2 amplifying signals collected by the transmit- receive antenna 1; an image reproducing processing part 3 for carrying out image reproducing processing, using an output signal from the wide-band transmit-receive part 2; an azimuth FFT part 4 performing the inverse Fourier transformation of an image in the proceeding direction of a platform; a spectrum dividing part 5 for dividing the Fourier transformed result of the image equally in a plurality of parts; an azimuth IFFT part 6 for performing the inverse Fourier transformation of the divided result; a picture element neighborhood averaging part 10 for performing the neighborhood averaging of the adjacent picture elements of the image obtained by inverse Fourier transformation; an image correlation part 7 for computing the correlation in all combinations of a plurality of images in the neighborhood averaged result of the picture elements; a phase compensating part 8 for computing the phase compensation quantity from the correlative result of the images to compensate the phase, and an image reproducing part 9 for reproducing the image from the phase compensated result.