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Sensors 2011, 11(11), 10765-10784; doi:10.3390/s111110765

Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS

Sensory Systems Research Group, University of Extremadura, 06006 Badajoz, Spain
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Received: 11 October 2011 / Revised: 8 November 2011 / Accepted: 9 November 2011 / Published: 15 November 2011
(This article belongs to the Special Issue Sensorial Systems Applied to Intelligent Spaces)
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Abstract

This work analyses the effect of the receiver movement on the detection by pulse compression of different families of codes characterizing the emissions of an Ultrasonic Local Positioning System. Three families of codes have been compared: Kasami, Complementary Sets of Sequences and Loosely Synchronous, considering in all cases three different lengths close to 64, 256 and 1,024 bits. This comparison is first carried out by using a system model in order to obtain a set of results that are then experimentally validated with the help of an electric slider that provides radial speeds up to 2 m/s. The performance of the codes under analysis has been characterized by means of the auto-correlation and cross-correlation bounds. The results derived from this study should be of interest to anyone performing matched filtering of ultrasonic signals with a moving emitter/receiver. View Full-Text
Keywords: doppler shift; ultrasonic LPS; kasami sequences; complementary set of sequences; loosely synchronous sequences doppler shift; ultrasonic LPS; kasami sequences; complementary set of sequences; loosely synchronous sequences
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Paredes, J.A.; Aguilera, T.; Álvarez, F.J.; Lozano, J.; Morera, J. Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS. Sensors 2011, 11, 10765-10784.

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