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Take Home Exercises
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Take Home Exercise #5


Navigate to the Corvallis website:  Introduction to GPS

After reviewing the content in the Corvallis website, answer the questions below in either
a Microsoft Word document or directly within an email body.
When complete, save the document in the following format: <Thx5lastname.doc> (.docx is also acceptable).
Attach your word document to an email and send to instructor by the due date.

1.  If uncorrected, what is the range of accuracy (in meters) that is obtainable from a GPS?  What technique will improve the accuracy to within 5 meters or less? (Ch.1)

2.  Based on the example given in Ch. 2, what information do you need to know in order to calculate your position?

3.  What information is stored in a GPS almanac? (Ch. 3)

4.  Define Ephemeris errors.  Explain the process implemented to correct for these errors. (Ch. 3)

5.  Explain how GPS determines the distance between satellite and receiver. (Ch. 4)

6.  For a GPS receiver to provide a 3-D position (position + elevation), a fourth satellite is required.  Why? (Ch. 5)

7.  What is Multipath error?  What is Selective Availability error? (Ch. 6)

8.   Define and explain DOP. (Ch. 7)

9.  How does differential correction allow GPS positions to be computed at a much higher level of accuracy? (Ch. 8)

10.  Explain how both technologies (GPS and GIS) are enhanced significantly when used together rather than separately. (Ch. 11)

Last Updated: 12/31/2014
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