On Grid Compressive Sampling for Spherical Field Measurements in Acoustics

TL;DR

This paper introduces a practical compressive sampling method for reconstructing spherical acoustic fields using measurements on an equiangular grid, achieving accurate results with fewer samples than traditional methods.

Contribution

It develops a new compressive sampling technique for spherical fields that uses a practical equiangular grid, with theoretical guarantees and improved efficiency over existing methods.

Findings

Requires fewer measurements than Nyquist sampling.

Achieves over 20 dB better denoising with one-third of measurements.

Performs comparably to other guaranteed compressive sampling methods.

Abstract

We derive a compressive sampling method for acoustic field reconstruction using field measurements on a predefined spherical grid that has theoretically guaranteed relations between signal sparsity, measurement number, and reconstruction accuracy. This method can be used to reconstruct band-limited spherical harmonic or Wigner $D$-function series (spherical harmonic series are a special case) with sparse coefficients. Contrasting typical compressive sampling methods for Wigner $D$-function series that use arbitrary random measurements, the new method samples randomly on an equiangular grid, a practical and commonly used sampling pattern. Using its periodic extension, we transform the reconstruction of a Wigner $D$-function series into a multi-dimensional Fourier domain reconstruction problem. We establish that this transformation has a bounded effect on sparsity level and provide numerical studies of this effect. We also compare the reconstruction performance of the new approach to classical Nyquist sampling and existing compressive sampling methods. In our tests, the new compressive sampling approach performs comparably to other guaranteed compressive sampling approaches and needs a fraction of the measurements dictated by the Nyquist sampling theorem. Moreover, using one-third of the measurements or less, the new compressive sampling method can provide over 20 dB better denoising capability than oversampling with classical Fourier theory.