A High-Precision RF Time-of-Flight Measurement Method based on Vernier Effect for Localization of Wireless Sensor Networks
| Autor: | Sang-il KO, Go AIKAWA, Jun-ya TAKAYAMA, Shinji OHYAMA |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Sensors & Transducers, Vol 135, Iss 12, Pp 27-41 (2011) |
| Druh dokumentu: | article |
| ISSN: | 2306-8515 1726-5479 |
| Popis: | This paper presents the fundamental principles of a high-precision RF time-of-flight (ToF) measurement method based on the vernier effect, which enables the improvement of time measurement resolution, for accurate distance measurement between sensor nodes in wireless sensor networks. Similar to the two scales of the vernier caliper, two heterogeneous clocks are employed to induce a new virtual time resolution that is much finer than clocks’ intrinsic time resolution. Consecutive RF signal transmission and sensing using two heterogeneous clocks generates a unique sensing pattern for the RF ToF, so that the size of the RF ToF can be estimated by comparing the measured sensing pattern with the predetermined sensing patterns for the RF ToF. RF ToF measurement experiments using this heterogeneous clock system, which has low operating frequencies of several megahertz, certify the proposed RF ToF measurement method through the evaluation of the measured sensing patterns with respect to an RF round-trip time of several nanoseconds. |
| Databáze: | Directory of Open Access Journals |
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