Vehicle classification in Sensor Networks using time-domain signal processing and Neural Networks

Authors:
Georgios P. Mazarakis;John N. Avaritsiotis
Affiliations:
Department of Electrical and Computer Engineering, National Technical University of Athens (NTUA), Athens, Greece;Department of Electrical and Computer Engineering, National Technical University of Athens (NTUA), Athens, Greece
Venue:
Microprocessors & Microsystems
Year:
2007

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Abstract

Vehicle classification is a demanding application of Wireless Sensor Networks. In many cases, sensor nodes detect and classify vehicles from their acoustic and/or seismic signature using spectral or wavelet based feature extraction methods. Such methods, while providing good results are quite demanding in computational power and energy and are difficult to implement on low-cost sensor nodes with limited resources. In this work, we investigate the use of a time-domain encoding and feature extraction method, to produce simple, fixed-size matrices from complex acoustic and seismic signatures of vehicles for classification purposes. Classification is accomplished using an Artificial Neural Network and a basic, L1 distance, archetype classifier. Hardware implementation issues on a prototype sensor node, based on an 8-bit microcontroller, are also discussed. For evaluation purposes we use real data from DARPA's SensIt project, which contains various acoustic and seismic signatures from two different vehicle types, a tracked vehicle and a heavy truck.