4.3.1. Triangulation and Trilateration

Try these first

1. 1.

   What is trilateration?

   Hint

   Think about how we use satellites for positions.

2. 2.

   Why do we need four satellites to determine a 3D position?

   Hint

   Visualize how a box unfolds in space.

3. 3.

   What is the key method used to determine a position in GPS?

   • Triangulation
   • Trilateration
   • Positioning

   Hint

   Think about using distances from satellites.

4. 4.

   True or False: A GPS receiver can determine its location using signals from three satellites.

   • True
   • False

   Hint

   Picture the dimensions you need.

5. 5.

   Explain the effect of atmospheric conditions on satellite signals as a function of distance. Consider how this affects trilateration accuracy.

   Hint

   Think about light passing through glass—distortions can occur.

6. 6.

   Calculate the error margin for a GPS positioning system when there are only three satellites in use. Discuss the implications for altitude accuracy.

   Hint

   Use geometric shapes to visualize the limits of your positioning.