Ultrasonic beacon-based Local Positioning System using Loosely Synchronous codes

Title	Ultrasonic beacon-based Local Positioning System using Loosely Synchronous codes
Publication Type	Conference Paper
Año de publicación	2007
Autores	del Perez, MC, Ureña, J, Hernández, Á, Marzziani, CD, Jimenez, A, Villadangos, JM, Álvarez, FJ
Idioma de publicación	English
Conference Name	5th IEEE International Symposium on Intelligent Signal Processing (WISP2007)
Volumen	1
Páginas	923 - 928
Editorial	IEEE
Conference Location	Alcalá de Henares, España
Fecha de publicación	03/10/2007
Numero ISBN	1-4244-0829-6
Palabras clave	Acoustic LPS, asynchronous detection, DS-CDMA, IFW, ISI, LS-codes, MAI.
DOI	10.1109/WISP.2007.4447594
URL	http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4447594
Abstract	This work presents the development of a Local Positioning System (LPS), based on the transmission of ultrasonic signals, which have been previously encoded by Loosely Synchronous (LS) codes. The LPS consists of several ultrasonic emitters located at known positions in the environment, and of a portable receiver that computes its position by measuring the Differences in Times of Arrival (DTOA) between a reference emitter and the others. LS codes exhibit an %Zero Correlation Zone (ZCZ) Interference Free Window (IFW) in the auto-correlation and cross-correlation functions. Therefore, if the relative time-offset of the codes are within the IFW, it is possible to have simultaneous emissions without interference, as well as to reduce the multipath effect.

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