Sundial: Using Sunlight to Reconstruct Global Timestamps

11 years 2 months ago
Sundial: Using Sunlight to Reconstruct Global Timestamps
Abstract. This paper investigates postmortem timestamp reconstruction in environmental monitoring networks. In the absence of a timesynchronization protocol, these networks use multiple pairs of (local, global) timestamps to retroactively estimate the motes' clock drift and offset and thus reconstruct the measurement time series. We present Sundial, a novel offline algorithm for reconstructing global timestamps that is robust to unreliable global clock sources. Sundial reconstructs timestamps by correlating annual solar patterns with measurements provided by the motes' inexpensive light sensors. The surprising ability to accurately estimate the length of day using light intensity measurements enables Sundial to be robust to arbitrary mote clock restarts. Experimental results, based on multiple environmental network deployments spanning a period of over 2.5 years, show that Sundial achieves accuracy as high as 10 parts per million (ppm), using solar radiation readings recorded...
Jayant Gupchup, Razvan Musaloiu-Elefteri, Alexande
Added 25 Nov 2009
Updated 25 Nov 2009
Type Conference
Year 2009
Where EWSN
Authors Jayant Gupchup, Razvan Musaloiu-Elefteri, Alexander S. Szalay, Andreas Terzis
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