Method of evaluating the image quality of a synthetic aperture r

Details Method of evaluating the image quality of a synthetic aperture r Method of evaluating the image quality of a synthetic aperture r

1995-02-16

1996-04-30

Pihulic, Daniel T.

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

Synthetic aperture radar

342 43, 342191, G01S 1390

Patent

active

055128998

ABSTRACT:
An active reflector including an antenna, a frequency converter, and a delay circuit is placed at a location within an area to be detected by a synthetic aperture radar. The active reflector receives an incoming radio wave emitted by the synthetic aperture radar and changes its frequency or delay time. The resultant radio wave is transmitted as a reflected radio wave toward the synthetic aperture radar. As a result, the position of the active reflector image displayed on the screen of the synthetic aperture radar is shifted. The ambiguity is quantitatively detected from the pixel value at the original display position at which the active reflector image was displayed before it was shifted, thereby evaluating the image quality of the synthetic aperture radar.

REFERENCES:
patent: 4450447 (1984-05-01), Zebker et al.
patent: 4786906 (1988-11-01), Krogager
IEICE Transactions on Communications, vol. E75-B, No. 8, Aug. 1992, Tokyo JP pp. 791-793. M. Fujita `An active reflector for SAR calibration having a frequency shift capability`.
10th Annual International Geoscience & Remote Sensing Symposium, vol. 1, May 1990, Washington US. pp. 795-798. P. S. Daleman et al. `Experience with active radar calibrators for airborne SAR`.
IEEE Antennas and Propagation Society International Symposium, 28 Jun. 1993, Michigan US. pp. 1280-1283 J. J. Ahne et al. `Design and implementation of single antenna polarimetric active radar calibrators`.
IEEE Transactions on Microwave Theory and Techniques, vol. 40, No. 6, 1992, New York US. pp. 1063-1069. H. D. Jackson et al. `Development of the ERS-1 active radar calibration unit`.
Patent Abstracts of Japan vol. 10, No. 195 (P-475) (2251) 9 Jul. 1986.

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