GPS Jamming Signal Classification with CNN Feature Extraction in low Signal-to-Noise Environments

Feature extraction techniques for ultrasonic signal classification

In this paper, we present two feature extraction techniques for the classification of ultrasonic NDE signals acquired from weld inspection regions of boiling water reactor piping of nuclear power plants. The classification system consists of a pre-processing block that extracts features from the incoming patterns, and of an artificial neural network that assigns the computed features to a parti...

Signal Detection and Modulation Classification in Non-Gaussian Noise Environments

Study on Carrier Phase Tracking Receivers in Difficult GPS Environments – Issues on Signal to Noise Ratio and Signal Acquisition

Current applications of GPS typically require the antenna of the user’s receiver to have a clear view of sky in order to acquire and track the line-ofsight signals. However, there is an increasing interest in using GPS indoors or in environments where there may be signal blockage. These include general applications where the GPS signals are likely to be severely attenuated, such as emergency ‘E...

Feature Extraction Techniques for Ultrasonic Shaft Signal Classification

Discrete Wavelet Transform (DWT) coefficients of ultrasonic test signals are considered useful features for input into classifiers due to their effective timefrequency representation of non-stationary signals. However, DWT exhibits a timevariance problem that has resulted in reservations for its wide acceptance. In this paper, a new technique to derive a preprocessing method for time-domain A-s...

Time-Frequency Based Feature Extraction for Non-Stationary Signal Classification

Biosignal recordings are useful for extracting information about the functional state of an organism. For this reason, such recordings are widely used as tools for supporting medical decision. Nevertheless, reaching a diagnostic decision based on biosignal recordings normally requires analysis of long data records by specialized medical personnel. In several cases, specialized medical attention...