Signal detection by means of orthogonal decomposition
JOURNAL OF INSTRUMENTATION(2018)
Abstract
Matched filtering is a well-known method frequently used in digital signal processing to detect the presence of a pattern in a signal. In this paper, we suggest a time variant matched filter, which, unlike a regular matched filter, maintains a given alignment between the input signal and the template carrying the pattern, and can be realized recursively. We introduce a method to synchronize the two signals for presence detection, usable in case direct synchronization between the signal generator and the receiver is not possible or not practical. We then propose a way of realizing and extending the same filter by modifying a recursive spectral observer, which gives rise to orthogonal filter channels and also leads to another way to synchronize the two signals.
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Key words
Data processing methods,Digital signal processing (DSP),Pattern recognition,cluster finding,calibration and fitting methods,Control and monitor systems online
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