The Global Positioning System (GPS) uses a constellation of 31 satellites orbiting the Earth at a high altitude. These satellites are strategically placed in six orbital planes, with four satellites in each plane. This arrangement ensures that at least four satellites are always visible from any point on Earth.
The GPS system relies on trilateration, which uses the time it takes for signals from multiple satellites to reach a receiver on Earth to calculate the receiver's position. Having multiple satellites provides redundancy and improves accuracy.
