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J. Mitaroff-Szecsenyi, P. Priller, T. Sauter:
"Compensating Software Timestamping Interference from Periodic Non-Interruptable Tasks";
Poster: 22nd IEEE International Conference on Emerging Technologies And Factory Automation (ETFA 2017), Limassol; 09-12-2017 - 09-15-2017; in: "Proceedings of the 22nd IEEE International Conference on Emerging Technologies And Factory Automation", (2017), 1 - 4.

For distributed measurements to be consistently
aligned a global notion of time within the network is necessary.
Clock synchronization performance is hampered by delays and
jitter accumulated not only in the network, but also in the
timestamping procedures of the devices being synchronized. The
resources available on such sensors are often constrained, both
by cost and power consumption. Software solutions on single processor
systems are common. While the synchronization process
is critical, it usually has a supporting role and therefore cannot
be assumed to have the highest priority. This paper analyzes the
influence of periodic, non-interruptable tasks (e.g. measurements)
on the timestamping process, presents mathematical models for
simulation and a modified median filter to efficiently deal with
these errors.