Real Time Motion Tracking by Seismic Wave Analysis

Abstract

Acoustic source localization has been considered a great point of focus in order to solve a wide range of applications, including detection, tracking and even source classification. In surveillance applications there are different types of sensors used to provide many approaches to the problem of source localization. In this application we use arrays of seismic sensors which provide a reliable sensing solution to the problem of real time object tracking by analyzing the waves the object generates while it moves over the ground. The aim of this work is to provide the position in real time of an object moving over a designated area on a soccer field, using arrays of geophones connected to a dual core development kit called DIOPSIS 740, which comprises of a DSP and a microcontroller. The DSP is able to process 1 Gflops @ 1 MHz and counts with 4 stereo analog inputs suitable for this application. The geometry of the array and different algorithms used to determine the direction of arrival (DOA) were also matter of analysis in this work to finally implement a pair of uniform linear arrays and an algorithm based on time-delay estimation for the source tracking.