GPS-based Clock Synchronization in a Mobile, Distributed Real-Time System

  • Authors:
  • Bernhard Sterzbach

  • Affiliations:
  • GPP Gesellschaft fü/r Proze\'mbox{\'ss}rechnerprogrammierung mbH, Kolpingring 18a, 82041 Oberhaching, Germany/ e-mail: best@gppm.de

  • Venue:
  • Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part I
  • Year:
  • 1997

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Abstract

In a vehicle tracking system computersaboard moving vehicles determine periodically their geographicalposition and transmit it to a control center. This paper presentsa commercial vehicle tracking system as an example of a distributedreal-time system with mobile components and focuses on the issueof clock synchronization. The mobile components of the systemobtain highly accurate timing information from the Global PositioningSystem which is used to synchronize their local clocks to UTCworld time. Thus a tight clock synchronization is achieved withoutimposing additional load on the communication channels of thesystem.