Using GPS Receivers

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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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