Method of minimizing leakage energy in a synthetic aperture rada

Details Method of minimizing leakage energy in a synthetic aperture rada Method of minimizing leakage energy in a synthetic aperture rada

1998-08-24

2000-08-29

Gregory, Bernarr E.

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

Synthetic aperture radar

342159, 342175, 342195, G01S 1390, G01S 1300

Patent

active

061115355

ABSTRACT:
A method of minimizing leakage energy in a synthetic aperture radar (SAR) system is based a Lagrangian function constructed from image-domain magnitude, and a "penalty function" based upon the choice of aperture. Broadly, the choice of penalty function is related to an estimate of undesirable energy lying outside of the main lobe of the impulse response introduced by the given aperture. Since there are no non-analytic constraints, the output image is purely an analytic function of the input, resulting in a more straightforward analysis and implementation while lessening the likelihood of pseudo-random phenomena. A tunable relative coefficient betveen the sidelobe energy estimate and the output magnitude allows control over a physically well-understood tradeoff between clutter contrast and point resolution. The generality of the technique may be extended to a multi-parameter minimization with possible applications in super-resolution, gap-filling, interferometry, and ultrasonic imaging, and ATR.

REFERENCES:
patent: 5068597 (1991-11-01), Silverstein et al.
patent: 5349359 (1994-09-01), Dallaire et al.
patent: 5644314 (1997-07-01), Ahmad et al.
patent: 5686922 (1997-11-01), Stankwitz et al.

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