3.4.11.2. Table of GPS error budget

Try these first

1. 1.

   What is ephemeris error?

   Hint

   Think about satellite positioning.

2. 2.

   What type of delay does the ionosphere cause?

   Hint

   Which layer of the atmosphere are we referring to?

3. 3.

   What is the primary cause of ephemeris errors?

   • Satellite clock errors
   • Inaccurate satellite positions
   • Receiver errors

   Hint

   Think about which error is tied to satellite locations.

4. 4.

   True or False: Multipath errors can occur in environments with large buildings.

   • True
   • False

   Hint

   Consider the environment's impact on signal pathways.

5. 5.

   If a GNSS receiver measures a distance of 500 meters, but abnormal atmospheric conditions introduce a ionospheric delay of 5 meters and multipath errors of 1.0 meter, what is the corrected distance?

   Hint

   Subtract the total error from the measured distance.

6. 6.

   A GNSS unit experiences a 3-meter clock error, a 2-meter ephemeris error, and a 1.5-meter receiver error. What is the total positioning error experienced?

   Hint

   Add up all the errors to find the total error.