Delay quantization technique to reduce steering errors in digita

Details Delay quantization technique to reduce steering errors in digita Delay quantization technique to reduce steering errors in digita

1989-02-03

1990-11-06

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367123, G01S 1100

Patent

active

049691325

ABSTRACT:
Quantized delay values used in a digital beamformer are selected so as to minimize the derivative of the beamformer pattern. A first set of quantization error values, one for each hydrophone, is determined from the precise delay values and a second set determined by adding a shading factor times the sample period to each member of the first set. Each set of combinations of members of the first and second sets of error values is then examined to determine which set minimizes the derivative of the beamformer pattern. The quantized delay values are then determined by selecting the quantized delay value corresponding to the error value in the set which minimizes the derivative.

REFERENCES:
patent: 4003016 (1977-01-01), Remley
patent: 4170766 (1979-10-01), Pridham et al.
patent: 4233678 (1980-11-01), Brady, III
patent: 4643028 (1987-02-01), Kondo et al.
patent: 4688045 (1987-08-01), Knudsen

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