Wavelet based monitoring of system parameters

A method comprising:

• monitoring a parameter associated with a system at each of a plurality of sensors to provide respective sensor signals representing the parameter;
• decomposing each of the plurality of sensor signals via an inverse wavelet transform by inserting zeros into coefficients representing the sensor signal to provide a set of wavelet transform coefficients for each signal;
• convolving the decomposed sensor signals with low-pass and high-pass filters;
• monitoring the sets of wavelet transform coefficients for aberrant coefficients;
• and
• alerting an operator via a user interface if an aberrant coefficient is detected.

An industrial control system comprising:

• a plurality of sensors, each located at a specific point in the industrial control system and configured to monitor at least one of a power, voltage, current, flow rate, pressure, temperature, humidity, and chemical concentration associated with the industrial control system;
• a controller configured to receive a signal representing the monitored at least one parameter from each of the plurality of sensors and adjust a function of the system based on the received signals;
• respective discrete wavelet transform components associated with each of the plurality of sensors, each of the discrete wavelet transform components configured to provide a set of discrete wavelet transform coefficients representing a content of the signal for its associated sensor to a discrete wavelet transform monitoring component associated with the controller;
• a signal reconstruction component configured to reconstruct a portion of the signal if a discrete wavelet transform coefficients of the sets of discrete wavelet transform coefficients provided by the discrete wavelet transform components departs from a defined range of values associated with the coefficient;
• and
• a fault analysis component configured to evaluate the reconstructed the portion of the signal to identify an anomaly represented by the coefficient falling outside of the defined range of values.