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Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
| Título | Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation |
| Tipo de publicación | Journal Article |
| Año de publicación | 2011 |
| Autores | Villadangos, JM, Ureña, J, Garcia, JJ, Mazo, M, Hernández, Á, Jiménez, A, Ruíz, D, Marzziani, CD |
| Idioma de publicación | English |
| Revista académica | Sensors |
| Volumen | 11 |
| Número | 11 |
| Páginas | 10326 - 10342 |
| Fecha de publicación | 11/2011 |
| Lugar de publicación | Basilea |
| Palabras clave | generalized cross-correlation; ultrasonic LPS; phase transform; Kasami codes |
| ISSN | 1424-8220 |
| DOI | 10.3390/s111110326 |
| Resumen | In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic Local Positioning System (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (Direct-Sequence Code Division Multiple Access) technique. Every beacon has been associated to a 255-bit Kasami code. The detection of signal arrival instant at the receiver, from which the distance to each beacon can be obtained, is based on the application of the Generalized Cross-Correlation (GCC), by using the cross-spectral density between the received signal and the sequence to be detected. Prior filtering to enhance the frequency components around the carrier frequency (40 kHz) has improved |
| DOI | 10.3390/s111110326 |