Sundial: Using Sunlight to Reconstruct Global Timestamps
| Autor: | Andreas Terzis, Alexander S. Szalay, Răzvan Musăloiu-E., Jayant Gupchup |
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| Rok vydání: | 2009 |
| Předmět: |
Sunlight
Offset (computer science) Computer science Real-time computing Clock drift 020206 networking & telecommunications 02 engineering and technology 7. Clean energy Light intensity 13. Climate action 020204 information systems 0202 electrical engineering electronic engineering information engineering Day length Timestamp Sundial |
| Zdroj: | Lecture Notes in Computer Science ISBN: 9783642002236 |
| DOI: | 10.1007/978-3-642-00224-3_12 |
| Popis: | This paper investigates postmortem timestamp reconstruction in environmental monitoring networks. In the absence of a time-synchronization 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 at 20 minute intervals. |
| Databáze: | OpenAIRE |
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