Method for automatic focusing of radar or sonar imaging systems

Details Method for automatic focusing of radar or sonar imaging systems Method for automatic focusing of radar or sonar imaging systems

1998-05-28

2000-03-14

Gregory, Bernarr E.

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

Synthetic aperture radar

342159, 342194, 342195, 367 7, 367 87, 367 88, G01S 1390, G01S 1589

Patent

active

060378921

ABSTRACT:
Automatic focusing of radar or sonar imaging systems, for example, synthetic aperture radar (SAR) or synthetic aperture sonar (SAS) systems, is accomplished by using high order measurements, such as the quadruple product of the range compressed signal g(x). The phase error is estimated by a recursive or non-recursive algorithm from the phase of the quadruple product. The estimated phase error is applied to the range-compressed SAR or SAS image data which is then azimuth compressed to obtain the focused image data.

REFERENCES:
patent: 4924229 (1990-05-01), Eichel et al.
patent: 4999635 (1991-03-01), Niho
patent: 4999653 (1991-03-01), Niho
patent: 5043734 (1991-08-01), Niho
patent: 5184134 (1993-02-01), Niho et al.
patent: 5200754 (1993-04-01), Niho
patent: 5248976 (1993-09-01), Niho et al.
patent: 5608404 (1997-03-01), Burns et al.
patent: 5952955 (1999-09-01), Kennedy et al.
"Phase Gradient Autofocus--A Robust Tool for High Resolution SAR Phase Correction," by D.E. Wahl et al., IEEE Tranactions on Aerospace and Electronic Suystem, vol. 30, No. 3, Jul. 1994, pp. 827-835.
"Speckle processing method of synthetic-aperture-radar phase correction," by P.H. Eichel et al., vol. 14, No. 1, Jan. 1, 1989, Optical Society of America, Optics Letters, pp. 1-3.
"Phase-gradient algorithm as an optimal estimator of the phase derivative," by P.H.Eichel et al., vol. 14, No. 20, Oct. 15, 1989, Optical Society of America, Optics Letters, pp. 1101-1103.

Affiliated with

Also associated with

Rating

Method for automatic focusing of radar or sonar imaging systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for automatic focusing of radar or sonar imaging systems , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for automatic focusing of radar or sonar imaging systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-173707