Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1992-06-24
1993-09-21
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, H01Q 322
Patent
active
052473104
ABSTRACT:
A transmit/receive layer is provided adjacent to an array of antenna elements. The transmit/receive layer has an array of transmit receive modules, each module associated with one of the antenna elements. An analog to digital converter and a digital to optical converter of one of the modules couple an RF signal from the associated antenna element to optical fibers. An optical to RF converter in each of the modules converts an amplitude modulated optical transmit signal from an optical fiber to an RF transmit signal for transmission by the associated antenna element. Frequency down and up converters can be added to perform super heterodyne frequency conversion based on a reference frequency control signal transmitted over the optical fibers. At the ends of the optical fibers opposite to the transmit/receive layer, a receive layer, a transmit layer, transmit and receive beamforming layers, dedicated signal synthesizer, control signals, and amplitude modulated optical diode lasers and photodiodes are provided. The transmit layer provides an array of amplitude modulated laser diodes, each associated with one of the antenna elements. The receive layer provides an array of receive optical to digital converters coupled to the optical fibers. A matrix of switches selects appropriate signals from the M.times.N array of parallel receiving beams for subsequent radar target surveillance, tracking, and identification processing.
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Issing Gregory C.
McDonnell Thomas E.
Miles Edward F.
The United States of America as represented by the Secretary of
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