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This paper presents the design of a scalable multi-axis control system that incorporates efficient data sharing using EtherCAT multicast over a set of homogeneous motion controllers. By associating each shared variable with a global clock-based timestamp and a dirty flag and by ensuring total order of distributed writes, the proposed system enables a cluster-architecture motion control environment...
In this paper a novel synchronization method for wireless sensor networks with star topology is presented. We address timing synchronization using low frequency real-time clocks in all nodes. A beacon-driven TDMA-protocol for bidirectional node/base communication is used. Between the beacons, which are sent by the base station, lie the superframe time intervals to handle data transmission from node...
In this paper, we introduce a cross-layer, application-oriented communication protocol for Wireless Sensor Networks (WSN). TSTP - Trustful Space-Time Protocol - integrates most services recurrently needed by WSN applications: Medium Access Control (MAC), spatial localization, geographic routing, time synchronization and security, and is tailored for geographical monitoring applications. By integrating...
Clock synchronization is a necessary feature in in-vehicle time- and safety-critical networks. The reason is that exact timing information has to be maintained in nodes, for instance for time stamps of messages that are important for safety-critical functions. A common time base has to be established at start-up time before time-sensitive data handling can begin. In vehicular applications, this clock...
Worst-case synchronization error is probably the most interesting performance index of clock synchronization protocols when used in real-time control applications. It depends on several factors, among which jitters on timestamp measurements and thermal variations in oscillators, which are very difficult to replicate in real systems. As a consequence, it makes little sense comparing the errors measured...
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