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Computationally efficient estimators for sequential and resolution-limited inverse problems. (English) Zbl 1349.62208
Summary: A common problem in the sciences is that a signal of interest is observed only indirectly, through smooth functionals of the signal whose values are then obscured by noise. In such inverse problems, the functionals dampen or entirely eliminate some of the signal’s interesting features. This makes it difficult or even impossible to fully reconstruct the signal, even without noise. In this paper, we develop methods for handling sequences of related inverse problems, with the problems varying either systematically or randomly over time. Such sequences often arise with automated data collection systems, like the data pipelines of large astronomical instruments such as the Large Synoptic Survey Telescope (LSST). The LSST will observe each patch of the sky many times over its lifetime under varying conditions. A possible additional complication in these problems is that the observational resolution is limited by the instrument, so that even with many repeated observations, only an approximation of the underlying signal can be reconstructed. We propose an efficient estimator for reconstructing a signal of interest given a sequence of related, resolution-limited inverse problems. We demonstrate our method’s effectiveness in some representative examples and provide theoretical support for its adoption.
62H12 Estimation in multivariate analysis
62H35 Image analysis in multivariate analysis
65F22 Ill-posedness and regularization problems in numerical linear algebra
94A12 Signal theory (characterization, reconstruction, filtering, etc.)
62P35 Applications of statistics to physics
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