A Localized Fourier Extension Method for Piecewise-Smooth Inverse Source Reconstruction

We reconstruct a piecewise-smooth source in a Poisson equation on a semi-infinite strip from noisy solution values measured along an interior line. Applying the one-dimensional Dirichlet Laplacian to the observation reduces the inverse problem to regularized second-order differentiation followed by a boundedly invertible correction. The differentiated trace and the source differ by an analytic smoothing term and therefore have the same interior singular support and jump data. This structure motivates a localized Fourier extension method that combines two staggered detection partitions, GTSVD-regularized local derivative coefficients, mollified conjugate Fourier sums, and structure-aligned numerical differentiation. The source is then recovered by an exponentially decaying spectral correction. For an exact partition, the reconstruction inherits the piecewise differentiation rate $\mathcal O(δ^{(\bar s-2)/\bar s})$; local peak and partition perturbation estimates describe the additional effect of breakpoint errors. Comparisons with full-grid total-variation regularization and truncated Fourier inversion show competitive high-noise performance and a pronounced low-noise advantage of the localized method. Repeated Gaussian-noise tests confirm robustness in the moderate- and low-noise regimes.

Source: arXiv:2608.19193v1 - http://arxiv.org/abs/2608.19193v1 PDF: https://arxiv.org/pdf/2608.19193v1 Original Link: http://arxiv.org/abs/2608.19193v1