Using GPS Receivers

JMU

Using GPS Receivers
Sofwtare Design Considerations

Prof. David Bernstein
James Madison University

Computer Science Department

bernstdh@jmu.edu

Qualitative Goals: A Reminder

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

Use of the observer pattern for the GPS receiver?
Need for a generic AVL subject/observer?

High Level Issues (cont.)

Where should the checksum calculations be performed?
Need for buffering?

Low Level Issues

Which sentences to process?
Longitude and Latitude formats
Intentionally missing fields in sentences
Possibility of intentionally misisng validation value
Units