Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Reexamination Certificate
2006-05-25
2009-11-17
Sotomayor, John B (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
C342S02500R, C342S02500R, C342S180000, C342S191000
Reexamination Certificate
active
07619554
ABSTRACT:
In a passive radar system a space-borne transmitter broadcasts wide-band digitally modulated signals over a region and illuminates the region. A receiver antenna is oriented to receive radiation from at least one portion of the region. The portion is an area viewed by the receiver antenna. A reference antenna is oriented toward the transmitter, the reference antenna receives a portion of the wide-band digitally modulated signal. A coherent processing time duration is selected based on: a radar cross-section of a target within the viewed area, a bandwidth of the wide-band digitally modulated signal, and the viewing angle of the receiver antenna. The received signal from the receiver antenna is coherently processed with a reference signal from the reference antenna, over a time interval greater than the coherent processing time duration.
REFERENCES:
patent: 7194139 (2007-03-01), Sariel et al.
patent: 2008/0088508 (2008-04-01), Smith
patent: 2008/0165048 (2008-07-01), Shklarsky
patent: 2009/0102705 (2009-04-01), Obermeyer
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