Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Combined with primary radar system
Patent
1994-04-06
1996-01-23
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Combined with primary radar system
G01S 1374
Patent
active
054868300
ABSTRACT:
An active, phase-coded, time-grating transponder and a synthetic-aperture radar (SAR) and signal processor means, in combination, allow the recognition and location of the transponder (tag) in the SAR image and allow communication of information messages from the transponder to the SAR. The SAR is an illuminating radar having special processing modifications in an image-formation processor to receive an echo from a remote transponder, after the transponder receives and retransmits the SAR illuminations, and to enhance the transponder's echo relative to surrounding ground clutter by recognizing special transponder modulations from phase-shifted from the transponder retransmissions. The remote radio-frequency tag also transmits information to the SAR through a single antenna that also serves to receive the SAR illuminations. Unique tag-modulation and SAR signal processing techniques, in combination, allow the detection and precise geographical location of the tag through the reduction of interfering signals from ground clutter, and allow communication of environmental and status information from said tag to be communicated to said SAR.
REFERENCES:
patent: 4786906 (1988-11-01), Krogager
patent: 4839658 (1989-06-01), Kathol et al.
Williamson et al., "A Coded Radar Reflector For Remote Identification of Personnel and Vehicles", The Record of the 1993 IEEE National Radar Conference, 1993, pp. 186-191.
Axline, Jr. Robert M.
Sloan George R.
Spalding Richard E.
Chafin James H.
Moser William R.
Ortiz Luis M.
Pihulic Daniel T.
The United States of America as represented by the United States
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