Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2005-11-04
2008-07-01
Issing, Gregory C (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
Reexamination Certificate
active
07394424
ABSTRACT:
The present invention concerns methods and apparatus for implementing a true-time-delay wideband digital beamformer. In true-time-delay wideband digital beamformers of the present invention, improved control over beam properties formed by the combination of the beamformer and a multi-element antenna coupled to the beamformer is achieved through finer control of delays imparted to data signals. In beamformers of the present invention, data is delayed using a coarse control that provides a delay in whole increments of a clock cycle of a digital clock reference and a fine control that provides a delay corresponding to a fraction of a whole clock cycle of the digital clock reference. In the true time delay method of the present invention, transmission and reception across a wide frequency band is accommodated. In the true time delay method of the present invention, multiple simultaneous beams are formed independently, beam-to-beam, across a wide frequency band.
REFERENCES:
patent: 5084708 (1992-01-01), Champeau et al.
patent: 5130717 (1992-07-01), Ewen et al.
patent: 5414433 (1995-05-01), Chang
patent: 7123882 (2006-10-01), Frazier
Fairfield David J.
Gallagher Fred
Jelinek Carl O.
Kaufman Steven L.
Smith Keith C.
Alkov Leonard A.
Issing Gregory C
Raytheon Company
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