Target ranging method based on synthetic aperture focused images

The invention discloses a target ranging method based on synthetic aperture focused images. The target ranging method disclosed by the invention comprises the following steps of: step 1, obtaining an equally-spaced line array camera position image sequence vertical to a target sight line by virtue of a small-hole imaging model camera, and taking a image of the camera position at the intersection point of a line array and a target sight line as a reference image; step 2, dividing a measurable distance range into a plurality of distance sections, and obtaining an aberration corrected and superposed image corresponding to each distance section, wherein each distance section is corresponding to one aberration corrected and superposed image; step 3, calculating the similarity between a neighbourhood area of each pixel in the reference image and a corresponding area in each aberration corrected and superposed image, and selecting the pixels as ranging pixels, wherein the changing ranges of the distances of the similarity of the pixels along with the aberration corrected and superposed images are greater than a preset threshold; and step 4, finding the distance section corresponding to the aberration corrected and superposed image with the maximum similarity, namely, the distance section in which target points corresponding to the ranging pixels are located. The target ranging method disclosed by the invention has the advantages of being low in realization cost, high in anti-interference capacity, simple in algorithm, and the like.