Accession Number : ADA006251

Title :   Evaluation of Algorithms for Linear Array Beamforming on the AN/UYK-17 (XB-1) (V) Signal Processing Element,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Froscher,Judith N.

Report Date : 28 JAN 1975

Pagination or Media Count : 49

Abstract : An overview of linear passive array beamforming is presented, the respective advantages of time-domain and frequency-domain beamforming are examined with processing by the Signal Processing Arithmetic Unit (SPAU) in mind, and three frequency-domain beamforming algorithms are analyzed. The SPAU has two's complement, fixed-point, rounded arithmetic. Through SPAU simulation, the effects of quantization are studied for two cases. First, the effect that quantization error has on the suppression of a weak signal in the desired direction by a strong interfering signal is examined by the determination of discrepancies between 'ideal' and fixed-point response curves. Second, a statistical study is undertaken to ascertain whether the error due to finite register length produces any major divergence from perfect results when a weak signal response is polluted with noise. Finally, the three frequency-domain algorithms are studied with regard to the efficient use of the SPAU's hardware.

Descriptors :   *Signal processing, *Acoustic arrays, Linear arrays, Passive systems, Beam forming, Algorithms

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE