Close-range multi-target detection method and security check system based on millimeter wave SAR

The invention relates to a short-distance multi-target detection method and security check system based on a millimeter wave SAR, and the method comprises the steps: carrying out the processing of a target echo signal obtained through the detection of a plurality of short-distance targets through the millimeter wave SAR, obtaining a defocused SAR image, carrying out the multi-time iteration compensation of the defocused SAR image, and in each compensation process, carrying out the multi-time iteration compensation of the defocused SAR image, and selecting the current compensation optimal power value according to a weighted image criterion, estimating according to the optimal power value to obtain an error phase for compensation until an entropy value corresponding to the SAR image after iteration compensation converges, obtaining a focused SAR image, finally processing the focused SAR image by using a morphological method, determining the number of targets in the image, and obtaining a target image. And accor