Minimum number of satellite signals?

minimum number of satellite signals required by a GPS navigation system to make an accurate position fix is


a. 1


b. 2


c. 3


d. 4


what is the correct answer?|||in order to get a fully-constrained position based on GPS satellite signals alone, you need a minimum of 4 svs. Under certain conditions (and assumptions), you can get by with 3 but that really depends on the Nav engine of the GPS receiver in question.





A misconception is that more than 4 svs increases accuracy. That is incorrect. More satellites yields:


- a more statistically confident solution (due to overdetermination)


- the ability to detect a bad measurement of a satellite and possibly remove the bad measurement