Dynamic logic algorithm used for detecting slow-moving or...

Details Dynamic logic algorithm used for detecting slow-moving or... Dynamic logic algorithm used for detecting slow-moving or...

2005-06-28

2005-06-28

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

C342S02500R, C342S02500R, C342S027000, C342S028000, C342S089000, C342S090000, C342S159000, C342S175000, C342S176000, C342S179000, C342S190000, C342S191000, C342S195000

Reexamination Certificate

active

06911933

ABSTRACT:
The present invention includes an application of a dynamic logic algorithm to detect slow moving targets. Show moving targets are going to be moving in the range from 0-5 mph. This could encompass troop movements and vehicles or convoys under rough terrain. The method can be defined as a seven step process of detecting slow moving targets using a synthetic aperture radar (SAR), said slow moving targets being objects of interest that are moving in the range from 0-5 mph, wherein this method is composed of the steps of receiving SAR signal history data having an SAR image; assuming a presence of slow moving target in a SAR image based-on range, cross-range position, and velocity; assuming a presence of clutter; assigning target and clutter models that are probability distribution functions (pdf) that are defined to account for every pixel in the SAR image, wherein the target is modeled using a sum of Gaussians fitted along the target shape model, while the clutter is modeled with a uniform distribution; computing a “target present” predetermined threshold value; converging the target model to a minimum variance value; and comparing the target model minimum variance value to the predetermined threshold to determine if a target is present or absent.

REFERENCES:
patent: 6400306 (2002-06-01), Nohara et al.
patent: 6426718 (2002-07-01), Ridgway
patent: 6518914 (2003-02-01), Peterson et al.
patent: 6608585 (2003-08-01), Benitz
patent: 6633253 (2003-10-01), Cataldo

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