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Improving System Clock Precision With NTP Offline Skew Correction

Author(s): Wolfgang Kiess, Stephan Zalewski, Martin Mauve.
Title: Improving System Clock Precision With NTP Offline Skew Correction
Published: MedHocNet 2007: Proceedings of the The Sixth Annual Mediterranean Ad Hoc Networking Workshop, pp. 159--164, Corfu, Greece, June 2007
Abstract: The precision of computer clocks in personaldigital assistant (PDA) class devices is typically quite low,they can easily drift more than 5 seconds per day. This isproblematic when such devices are used for mobile ad-hocnetwork experiments, in which it is often necessary thatdevices distributed over a large area perform a certainaction like sending packets simultaneously. We present inthis paper a simple method that improves clock precisionwith standard Linux software components. This methodis experimentally evaluated and it is shown that the clockprecision in the devices used (HP iPAQ5550 and SharpZaurus SL-6000) improves by two orders of magnitude.
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