Title :
On the Use of Magnetically Coupled Resonators for Chirp-Based Timestamping
Author :
De Angelis, Alessio ; Dionigi, Marco ; Moschitta, Antonio ; Carbone, Paolo ; Sisinni, Emiliano ; Ferrari, Paolo ; Flammini, Alessandra ; Rinaldi, Stefano
Author_Institution :
Dept. of Eng., Univ. of Perugia, Perugia, Italy
Abstract :
The knowledge of the time value at which an event of interest occurred is the typical feature needed to perform many kinds of postprocessing in distributed sensor networks. Consequently, network-based distributed systems must support time dissemination in order to ensure that relative clock errors among nodes remain below a certain threshold. Despite many protocols being well established for wired connections, the wireless sensor network paradigm required a new approach to address adverse characteristics of the wireless medium. In this paper, the adoption of low-frequency signaling is proposed for overcoming some issues of radio frequency transmissions when used for timestamping events. The proposed approach is characterized using numerical simulations and an experimental prototype, based on inductive coupling of tuned resonators. Experimental tests confirm the effectiveness and feasibility of this approach that achieves microsecond-order time recovery performance in practical system configurations.
Keywords :
clocks; resonators; wireless sensor networks; chirp-based timestamping; distributed sensor networks; inductive coupling; low-frequency signaling; magnetically coupled resonators; network-based distributed systems; radio frequency transmissions; relative clock errors; time dissemination; timestamping events; tuned resonators; wired connections; wireless medium; wireless sensor network paradigm; Chirp; Jitter; Numerical simulation; Synchronization; Wireless sensor networks; Magnetic coupling; synchronization; time dissemination; timestamping; wireless sensor networks (WSNs); wireless sensor networks (WSNs).;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2015.2463332