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On-line timestamping synchronization in distributed sensor architectures

Olivier Bezet and Véronique Cherfaoui

Presented at IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS 2005), San Francisco, California, March 7 - 10, 2005


This paper describes a solution for on-line timestamping in a distributed architecture embedded in an experimental vehicle. Interval timestamping is used, taking into consideration sensor latency, transmission delay and clock granularity. This solution does not change local system clocks, so that the network configuration can change without affecting timestamping precision. It uses the synchronous bus network clock to estimate the drift of all computer clocks and to exchange data timestamps with high precision. Experimental simulations show the advantages of this solution. The method is well adapted to dynamic applications, where data timestamping is important for real time considerations. An application in the field of intelligent vehicles is then described.

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