Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1993-04-15
1994-10-04
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342154, 342157, H01Q 322
Patent
active
053530330
ABSTRACT:
A true time delay phased array is provided which includes a digital subarray interface in the transmit signal path. The digital transmit signal path interface includes a digital reference signal generation means and digital signal propagation means for supplying the digital reference signal to the subarray. Each subarray includes RF carrier signal generating means for generating an RF carrier signal phase coherent with the reference signal, a fiber optic true time delay circuit for applying an appropriate phase delay to the RF carrier and an appropriate true time delay to the modulation signal, and a waveform modulator for modulating the modulating signal onto the phase locked RF carrier signal to provide the transmit signal for the subarray. The present invention can be used in conjunction with existing digital interface technology for receive and control signal paths to provide an entirely digital subarray signal path interface.
REFERENCES:
patent: 5051754 (1991-09-01), Newberg
patent: 5231405 (1993-07-01), Riza
Newberg Irwin L.
Nussbaum Howard S.
Smalanskas Joseph P.
Wolfson Ronald I.
Wooldridge John J.
Alkov L. A.
Blum Theodore M.
Denson-Low W. K.
Hughes Aircraft Company
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