Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1998-10-22
1999-09-21
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342108, 342127, 342145, H01Q 302, H01Q 312
Patent
active
059559918
ABSTRACT:
An object is to provide a cheap digital beamforming radar apparatus. For achieving it, the radar apparatus of the present invention comprises a transmit section for radiating a transmit signal in the form of an electromagnetic wave, an array antenna comprised of a plurality of antenna elements for receiving an electromagnetic wave re-radiated from an object when the electromagnetic wave of the transmit signal reaches the object, as a receive signal, a switching device for connecting either one of the antenna elements to a predetermined terminal in an alternative way by a switching signal, a receive section for downconverting the receive signal obtained from the predetermined terminal by use of part of the transmit signal to generate a difference signal between the transmit signal and the receive signal and converting this difference signal to a digital signal, and a digital signal processing section for subjecting the digital signal from the receive section to a predetermined process to detect a distance to the object or a relative velocity of the object.
REFERENCES:
patent: 3103009 (1963-09-01), Baker
patent: 4121221 (1978-10-01), Meadows
patent: 4924234 (1990-05-01), Fujisaka et al.
patent: 5225839 (1993-07-01), Okurowski et al.
Phan Dao L.
Tarcza Thomas H.
Toyota Jidosha & Kabushiki Kaisha
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