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Using GPS Receivers
Sofwtare Design Considerations


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Qualitative Goals: A Reminder
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  • Adequate - Meets all of the requirements and satisfies all of the constraints
  • Reliable - Low probability of failure under normal operating conditions
  • Robust - Able to operate under a wide variety of condtions
  • Safe - Able to minmize the damage resulting from failure
  • Easy to Repair and Enhance
  • Easy to Understand/Document and Use
  • Easy to Re-use
High Level Issues
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  • Use of the observer pattern for the GPS receiver?
  • Need for a generic AVL subject/observer?
High Level Issues (cont.)
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  • Where should the checksum calculations be performed?
  • Need for buffering?
Low Level Issues
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  • Which sentences to process?
  • Longitude and Latitude formats
  • Intentionally missing fields in sentences
  • Possibility of intentionally misisng validation value
  • Units
There's Always More to Learn
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