Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1996-12-30
1999-11-02
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342157, H01Q 322
Patent
active
059779110
ABSTRACT:
An active array radar system is controlled by photonic signals. The array of N antenna elements is divided into M subarrays, each having N/M antenna elements. Tunable lasers provide M optical wavelengths within non-overlapping bands. For reception, the microwave signals are optically modulated onto a single fiber for each subarray. Time delays are introduced for an offset between elements in a subarray and for an offset between subarrays. By using wavelength division multiplexing, a true time delay is attributed to each antenna element on the array. A non-coherent optical combiner having an array of N photodetectors demodulates the receive signals and recovers the coherent sum of the RF signals.
REFERENCES:
patent: 5247309 (1993-09-01), Reich
patent: 5374935 (1994-12-01), Forrest
patent: 5583516 (1996-12-01), Lembo
patent: 5751242 (1998-05-01), Goutzoulis et al.
patent: 5818386 (1998-10-01), Belisle
Russell, M., et al., "Photonically controlled, wavelength division multiplexing (WDM) active array," Society of Optical Engineers Meeting Proceedings, 9 pages.
Proposal for Photonically Controlled Active Array, Raytheon Technical Proposal, pp. i-iv and sections 2-1 -2-39, Jan. 30, 1995.
Green Leon
Preiss Joseph A.
Blum Theodore M.
Raytheon Company
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