Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-12-27
2005-12-27
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S346000, C375S347000, C455S296000, C455S132000
Reexamination Certificate
active
06980614
ABSTRACT:
A beamforming system and method. The inventive beamforming system is adapted for use with an array antenna having a plurality of antenna elements and includes a Fast Fourier Transform (EFT) for transforming a signal received by an antenna into a plurality of frequency subbands. A plurality of adaptive processors are included for performing adaptive array processing on each of the subbands and providing a plurality of adaptively processed subbands in response thereto. A normalizing processor is also included for normalizing the adaptively processed subbands. In the illustrative embodiment, the signal is a Global Positioning System (GPS) signal and a digital multiplier for applying a weight to a respective frequency subband for each of the elements of the array. The weights are chosen to steer a beam in a direction of a desired signal. Normalization involves adjusting the amplitude of one or more of the subbands to remove any bias distortion due to the adaptive processing thereof.
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Miller Thomas W.
Reed Christopher W.
Alkov Leonard A.
Chin Stephen
File Erin M.
Raytheon Company
Vick Karl A.
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