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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
* Author to whom correspondence should be addressed.
Received: 11 October 2011; in revised form: 8 November 2011 / Accepted: 9 November 2011 / Published: 15 November 2011
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.
Keywords: doppler shift; ultrasonic LPS; kasami sequences; complementary set of sequences; loosely synchronous sequences
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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.
Paredes JA, Aguilera T, Álvarez FJ, Lozano J, Morera J. Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS. Sensors. 2011; 11(11):10765-10784.
Paredes, José A.; Aguilera, Teodoro; Álvarez, Fernando J.; Lozano, Jesús; Morera, Jorge. 2011. "Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS." Sensors 11, no. 11: 10765-10784.