3.4.7. Working of a GNSS

Try these first

1. 1.

   What is pseudo-range?

   Hint

   Think about how distance is measured.

2. 2.

   How many satellites are needed for basic position fixing?

   Hint

   Recall the trilateration process.

3. 3.

   What does the term 'pseudo-range' refer to?

   • A direct measurement of distance
   • A calculated distance based on signal travel time
   • An error in positioning

   Hint

   Think about how distance is measured using time.

4. 4.

   True or False: Trilateration requires signals from at least three satellites.

   • True
   • False

   Hint

   Recall the definition of trilateration.

5. 5.

   A GNSS receiver receives signals from four satellites. The pseudo-ranges calculated are 20000 m, 15000 m, 18000 m, and 17000 m. Describe how you would determine the receiver's location, considering potential errors.

   Hint

   Apply the cascading process of trilateration and consider all four measurements.

6. 6.

   In a hypothetical scenario, if a new satellite is launched, and its signals are delayed due to solar activity, how would you adjust the system to maintain accuracy in positioning?

   Hint

   Think about how other satellites can compensate for signal issues.