A REFLECTION MODEL FOR ULTRASONIC TOF MEASUREMENTS FOR INDOOR APPLICATIONS

Ferdinand van der Heijden, Gloria Tuquerres, Paul Regtien

Abstract

An acoustic position measurement system is based on a time-of-flight (ToF) measurement of an acoustic tone burst. In indoor situations, the accuracy of the measurement is often affected by echoes generated by nearby objects around the measurement set-up. The problem how to model these echoes is addressed in the paper. Such a model is useful for the development of ToF measurement methods that can deal effectively with the echoes. The proposed model is a zero mean, non-stationary stochastic process statistically defined by its autocovariance function. We are able to specify this function by means of a few parameters. Experiments performed validate the proposed model. We show that the proposed autocovariance function and the one deduced from experimental data can approximately be brought in accordance.

Keywords

ultrasonic position measurement, reflection model, time-of-flight

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PWC-2003-TC7-006.pdf

DOI

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IMEKO TC

TC7 - Measurement Science

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