Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance and direction
Reexamination Certificate
2007-02-20
2009-02-24
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance and direction
C342S109000, C342S070000, C342S111000, C342S129000, C342S133000, C342S146000, C342S147000, C342S192000
Reexamination Certificate
active
07495604
ABSTRACT:
A sampled beat signal is cut out into two or more short time data in a time direction concerning each antenna component. From a frequency spectrum of the short time data, an interference element frequency of an interference wave is detected. From the interference element frequency of the interference wave, two or more candidates of the frequency before aliasing of the interference wave are produced, and phase correction is executed on each candidate. Digital Beamforming is executed on the corrected frequency so as to extract maximum peaks of the power of an azimuth direction, and the frequency candidate showing the maximum peak power is selected and the arrival azimuth of the interference element is estimated. A filter for suppressing the interference element is applied on the short time data from the estimated arrival azimuth of the interference element so as to suppress the interference element.
REFERENCES:
patent: 2004/0183719 (2004-09-01), Natsume et al.
patent: 11-231040 (1999-08-01), None
Nobuo Kikuma: “Adaptive Signal Processing by Array Antenna” (Japan, 1998).
Tim J. Nohara: “Adaptive Mainbeam Jamming Suppression For Multi-Function Radars,” Sicom Systems Ltd., Ontario, Canada. (Presented at the IEEE 1998 National Radar Conference, Daias, TX, May 12-13, 1998).
Natsume Kazuma
Sakamoto Mai
Watanabe Yuu
Yamano Chiharu
Brainard Timothy A
Buchanan & Ingersoll & Rooney PC
Denso Corporation
Tarcza Thomas H
Zielinski Robert F.
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