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New insights and extensions of split-spectrum algorithms from an optimum distributed detection perspective

In this paper we approach Split-spectrum (SS) automatic detection from a distributed detection perspective. The basic idea is to implement an energy detector at the output of every band-pass filter, and then to fuse all the detections to generate a final decision for every time index. The individual detectors are optimally designed by using the subspace matched filter theory (briefly, every band-pass filter is equivalent to the projection into a tuned subspace). The fusion is also optimized by using the well established theory of distributed detection. The proposed detection algorithms are applied to the analysis of the ultrasonic NDE of the inner layer structure of the vault of a Spanish basilica. The results show the interest of the proposed new detection schemes