5.2.3. Principles of GPS Operation

Try these first

1. 1.

   What method does GPS use to determine location?

   Hint

   It involves measuring distances from satellites.

2. 2.

   How many satellites are required for basic GPS positioning?

   Hint

   Think about why more than three is necessary.

3. 3.

   What does DOP stand for in GPS terminology?

   • Distance of Precision
   • Dilution of Precision
   • Data Optimization Point

   Hint

   It’s about accuracy in positioning.

4. 4.

   True or False: A minimum of three satellites is sufficient for a two-dimensional GPS position.

   • True
   • False

   Hint

   Three satellites will not determine height.

5. 5.

   If a GPS receiver detects signals from satellites A, B, C, and D with measured distances of 2000m, 1500m, 1800m, and 1700m respectively, how would you determine its location? Provide a detailed explanation of the trilateration method.

   Hint

   Visualize the process as intersecting spheres.

6. 6.

   Discuss how an urban environment impacts the satellite signals received by a GPS device. Specify potential errors that could arise.

   Hint

   Think about where buildings block signals.