1. A three-frame difference moving target-tracking system for target track identification for use on a moving platform, the system configured to: perform a three-frame difference calculation on a first offset image, a second offset image and a reference image to generate a three-frame difference output image; and perform clutter suppression on the three-frame difference image by dividing the three-frame difference output image by a background image gradient to generate a clutter-suppressed output image, wherein the reference frame is updated for each subsequent performance of the three-frame difference calculation.