3.4.11. Errors in GNSS Observations

Try these first

1. 1.

   What can cause signal blockage when using GNSS?

   Hint

   Think of where you find tall structures.

2. 2.

   What is multipath error?

   Hint

   Consider a bouncing ball.

3. 3.

   What is the main cause of multipath error in GNSS?

   • A. Signals being blocked
   • B. Reflection of signals off surfaces
   • C. Errors in satellite positioning

   Hint

   Think about how light bounces.

4. 4.

   True or False: Receiver clocks are generally more accurate than satellite atomic clocks.

   • True
   • False

   Hint

   Consider the reliability of different types of clocks.

5. 5.

   A GNSS receiver is positioned near tall buildings. It experiences a 3-meter error due to signal blockage. How could this issue be reduced if the receiver is frequently used in urban areas?

   Hint

   Think about how you could improve the environment around the GNSS receiver.

6. 6.

   Describe how you would measure and mitigate atmospheric delays when conducting a GNSS survey in varying weather conditions.

   Hint

   Consider what weather impacts signal travel times.