Sparse Reconstruction Of Far-field Scattering Acoustic Field Upon Near-field Measurement

The scattering characteristics of underwater targets are the basis for target detection,recognition and active echo reduction.The application of active echo reduction based on near-field measurement and far field reconstruction in this pape.It is verified that the equivalent source method is also applicable to the reconstruction of scattering acoustic field.This paper analyzes the influence of detection frequency,equivalent source parameters and the number of measurement points on the reconstruction of scattering acoustic field by simulation and measured data.The problem of acoustic field reconstruction is determination of the number of measuring points.In this paper,the equivalent source is sparsely represented to achieve sparse reconstruction of scattering acoustic field with few measurement points.Based on the compressed mode equivalent source model,a singular value decomposition method based on the transfer matrix between the equivalent source point and each direction of the far field is proposed.This method solves the problem of determining the sparsity and the number of measuring points.The effectiveness of this method is demonstrated by simulation and experimental data.The effective independence method and singular value decomposition method are used to optimize the near field measurement array structure.The number of measuring points is further reduced on the premise of accurate acoustic far field prediction.