Side looking SAR system
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United States of America Patent
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Mar 22, 2005
Grant Date -
Aug 5, 2004
app pub date -
Mar 30, 2004
filing date -
Mar 15, 2001
priority date (Note) -
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status (Latency Note)
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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.
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