High speed weighting signal generator for sidelobe canceller

Details High speed weighting signal generator for sidelobe canceller High speed weighting signal generator for sidelobe canceller

2006-10-31

2006-10-31

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

C342S378000, C367S087000, C367S905000

Reexamination Certificate

active

07129888

ABSTRACT:
A sidelobe canceller for a transducer arrangement such as an antenna or sonar transducer uses a main transducer and one or more auxiliary transducers. The auxiliary received signals are weighted by FIR filters or by multipliers, and the weighted auxiliary signals are summed, and the summed, weighted auxiliary signals are subtracted from the main signal to produce the desired low-sidelobe main signal. The weighting signals are generated in conventional manner from intermediate weighted signals. The intermediate weighting signals are produced by a reduced-hardware arrangement. When FIR filters are used, the signals being multiplied by weights include mutually delayed samples.

REFERENCES:
patent: 4217586 (1980-08-01), McGuffin
patent: 4688187 (1987-08-01), McWhirter
patent: 4941117 (1990-07-01), Yuen
patent: H1005 (1991-12-01), Gerlach
“Time and Order Recursive Multichannel Adaptive Filtering Techniques,” Ph. D dissertation by Yuen, University of Pennsylvania, 1988.
USPTO disclosure document H1005, “Gram-Schmidt Space-Time Adaptive Filter Using Transverse Orthonormal Ladder Filters,” published Dec. 3, 1991, Gerlach.

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