An equivalent source method to determine complex excitation levels of antenna arrays from near-field measurements

2007 ◽  
Author(s):  
M.M. Leibfritz ◽  
F.M. Landstorfer ◽  
T.F. Eibert
Keyword(s):  
Antenna Arrays ◽  
Near Field ◽  
Field Measurements ◽  
Equivalent Source ◽  
Source Method ◽  
Equivalent Source Method

scholarly journals An Improved Algorithm for Noise Source Localization Based on Equivalent Source Method

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Zhongming Xu ◽  
Qinghua Wang ◽  
Yansong He ◽  
Zhifei Zhang ◽  
Shu Li ◽  
...  
Keyword(s):  
Source Localization ◽  
High Frequency ◽  
Noise Source ◽  
Near Field ◽  
Low Frequency ◽  
Equivalent Source ◽  
Source Method ◽  
Functional Equivalent ◽  
Acoustical Holography ◽  
Equivalent Source Method

Near-field acoustical holography (NAH) based on the equivalent source method (ESM) is an efficient method applied for noise source identification. Asl2-norm-based regularization cannot produce a satisfactory solution of the ill-conditioned problem in high frequency, the conventional ESM is restricted to relatively low frequency, and the resolution of conventional ESM in middle to high frequency remains a limitation open to investigation. This article presents an algorithm known as improved functional equivalent source method (IFESM), designed to enhance the resolution of conventional ESM. This method is developed in the framework of wideband acoustical holography (WBH) combining with functional beamforming (FB). Through numerical simulations, it is proved that the proposed method can localize noise with higher resolution compared with WBH and conventional ESM, and the ghosts on noise source map can be suppressed effectively. The validity and the feasibility of the proposed method are manifested by experiments including single-source and coherent-source localization.

A block bayesian compressive sensing method based on the equivalent source method for near-field acoustic holography

2021 ◽  
pp. 107754632110564
Author(s):  
Ming Zan ◽  
Zhongming Xu ◽  
Linsen Huang ◽  
Zhonghua Tang ◽  
Zhifei Zhang ◽  
...  
Keyword(s):  
Compressive Sensing ◽  
Sound Source ◽  
Near Field ◽  
Wave Number ◽  
Signal To Noise ◽  
Acoustic Holography ◽  
Equivalent Source ◽  
Source Method ◽  
Reconstruction Performance ◽  
Equivalent Source Method

The conventional equivalent source method for near-field acoustic holography is an effective noise diagnosis method using microphone array. However, its performance is limited by microphone spacing, so the effect is unsatisfied when the wave number is high. In this paper, to broaden the frequency suitability and improve the performance of sound source reconstruction with low signal-to-noise ratios, a block Bayesian compressive sensing method based on the equivalent source method is proposed. Numerical results show that this proposed method has a good reconstruction performance and makes wideband reconstruction possible. By changing the frequency, location, and signal-to-noise ratio of the sound source, the reconstruction performance of the proposed method can remain stable. Finally, the validity and practicability of the proposed method are verified by experiments.

A sparse equivalent source method for near-field acoustic holography

2017 ◽  
Vol 141 (1) ◽  
pp. 532-542 ◽  
Author(s):  
Efren Fernandez-Grande ◽  
Angeliki Xenaki ◽  
Peter Gerstoft
Keyword(s):  
Near Field ◽  
Acoustic Holography ◽  
Equivalent Source ◽  
Source Method ◽  
Equivalent Source Method
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