Application of Hermite Fractional Time Delay Filter in Simulation of Inverse Beamforming of Sonar Signal Source

doi:10.3969/j.issn.1000-1093.2019.07.016

Abstract

Abstract: For the phenomena that amplitude-frequency and group delay characteristics of traditional fractional delay filters deteriorate at the high-frequency band of signal, a time delay filter based on the Hermite interpolation polynomial is proposed to approximate the system function of the ideal non-integer delay filter. A Farrow-type structure is established to solve the excessive attenuation and variable delay in the high-frequency part of array sonar signal source simulation. Simulated and experimental results show that the frequency response of Hermite fractional delay filter is better than that of the traditional fractional delay filter, and the mean square error in the entire normalized frequency band is only 8.18%. In beamforming, the Hermite fractional delay filter has a smaller attenuation at the high frequency band, making its beam pattern have a smaller sidelobe level. The mean square errors of simulation and experimental signals are kept in about 0.97%, which verifies the effectiveness of Hermite fractional delay filter. Key

Key words: fractionaldelayfilter, Hermiteinterpolationpolynomial, time-domainbeamforming, Farrowtypedesign

CLC Number:

TN929.3

WANG Lening， YU Min， YAO Zhixiang, ZHANG Xiaoliang. Application of Hermite Fractional Time Delay Filter in Simulation of Inverse Beamforming of Sonar Signal Source[J]. Acta Armamentarii, 2019, 40(7): 1460-1467.

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第40卷
第7期2019 年7月兵工学报ACTA
ARMAMENTARIIVol.40No.7Jul.2019

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