PGA METHOD AND APPARATUS FOR TRACKING TARGET BASED ON PHASE GRADIENT AUTOFOCUS

摘要

According to the present invention, there is provided a PGA-based target detection image generation method comprising: obtaining a SAR (Synthetic Aperture Radar) image of a target surface to be detected, extracting a pixel having a predetermined predetermined pixel value from the SAR image, and reconstructing the image Generating a pixel; and performing a pixel selection in a distance direction and an azimuth direction for each pixel of the reconstructed image, selecting an effective distance index based on a result of the pixel selection; Comparing the number of the effective distance indexes with a preset reference number, and when the number of the effective distance indexes is greater than the preset reference number, determining the selected effective distance index as a first distance index for autofocusing; And the direction of the reconstructed image when the number of the effective distance index is less than the preset reference number. Determining a second distance index for autofocus based on the line, and performing phase gradient autofocus based on the determined first distance index or the second distance index to obtain an image for target detection. It may comprise the step of generating.