How many signals can be simultaneously received from the GPS constellation of satellites at any location on the ground?

Receiving signals from the GPS constellation requires a minimum of four satellites to provide accurate positioning and to calculate three-dimensional coordinates (latitude, longitude, and altitude) as well as to synchronize the satellite clocks with the receiver's clock. Each satellite transmits a unique signal, and when these signals are processed together, it allows for the solution of the receiver's position with respect to time, utilizing the principles of trilateration.

While a receiver can technically pick up signals from more than four satellites at once, the fundamental requirement for obtaining a precise three-dimensional position is that four satellites must be in view. This is because the fourth satellite is crucial for resolving the timing discrepancies and ensuring the accuracy of the location calculation, effectively eliminating clock errors that can occur. Thus, the capability to receive signals from four or more satellites ensures optimal performance and reliability in GPS positioning.