Qualitative feature extraction from sensor data using short-time Fourier transform

Abolfazl Mahiari Amini

doi:10.1117/12.602578

25 May 2005 Qualitative feature extraction from sensor data using short-time Fourier transform

Abolfazl Mahiari Amini

Proceedings Volume 5817, Visual Information Processing XIV; (2005) https://doi.org/10.1117/12.602578
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

The information gathered from sensors is used to determine the health of a sensor. Once a normal mode of operation is established any deviation from the normal behavior indicates a change. This change may be due to a malfunction of the sensor(s) or the system (or process). The step-up and step-down features, as well as sensor disturbances are assumed to be exponential. An RC network is used to model the main process, which is defined by a step-up (charging), drift, and step-down (discharging). The sensor disturbances and spike are added while the system is in drift. The system runs for a period of at least three time-constants of the main process every time a process feature occurs (e.g. step change). The Short-Time Fourier Transform of the Signal is taken using the Hamming window. Three window widths are used. The DC value is removed from the windowed data prior to taking the FFT. The resulting three dimensional spectral plots provide good time frequency resolution. The results indicate distinct shapes corresponding to each process.

Citation Download Citation

Abolfazl Mahiari Amini "Qualitative feature extraction from sensor data using short-time Fourier transform", Proc. SPIE 5817, Visual Information Processing XIV, (25 May 2005); https://doi.org/10.1117/12.602578

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