Side looking SAR system

Details Side looking SAR system Side looking SAR system

2005-03-22

2005-03-22

Gregory, Bernarr E. (Department: 3662)

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

Synthetic aperture radar

C342S02500R, C342S02500R, C342S059000, C342S175000, C342S195000

Reexamination Certificate

active

06870500

ABSTRACT:
A synthetic aperture radar (SAR) processes radar has a transmit aperture and a receive aperture that is of a different size from the transmit aperture. The receive aperture is separated from the transmit aperture and is divided into a number of receive sub-apertures arranged in the elevation and azimuth directions. Circuitry is used to process the received radar signal coherently by phase shifting each receive sub-aperture signal by a time and/or frequency variant phase value and by summing the resulting signals from receive sub-apertures arrayed along the elevation direction, whereby the time and/or frequency variant phase value is generated in such a way that the radar echo signal is maximized in the summed signal as the radar transmit signal runs over the earth's surface.

REFERENCES:
patent: 4088978 (1978-05-01), Gilmour
patent: 4253098 (1981-02-01), Blythe
patent: 4325065 (1982-04-01), Caputi, Jr.
patent: 4462032 (1984-07-01), Martin
patent: 4727373 (1988-02-01), Hoover
patent: 4989008 (1991-01-01), Fujisaka et al.
patent: 5059966 (1991-10-01), Fujisaka et al.
patent: 5295118 (1994-03-01), Gilmour
patent: 5898399 (1999-04-01), Carrara et al.
IEEE Transactions on Geoscience and Remote Sensing, 27 (1989) Jul., No. 4, pp. 375-383 by Ronald Kwok et al. entitled Block Adaptive Quantization of Magellan SAR Data.
IEEE Transactions on Geoscience and Remote Sensing, 28 (1990) Jan., No. 1, pp. 88-96 by Fuk K. Li et al. entitled Studies of Multibaseline Spaceborne Interferometric Synthetic Aperture Radars.

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