How is the Line of Position (LOP) calculated using GPS satellites?

The Line of Position (LOP) is calculated by utilizing data transmitted from multiple GPS satellites. Each satellite sends out a unique time code that indicates the moment the signal was transmitted. A GPS receiver captures these signals and uses the time it took for each signal to reach the receiver to calculate the distance to each satellite, based on the speed of light.

This process allows the receiver to determine its position in three-dimensional space (latitude, longitude, and altitude) relative to the satellites. Essentially, the time difference in receiving signals from at least four satellites enables the GPS receiver to pinpoint its exact position on Earth, forming a precise Line of Position. This method relies on the synchronization of satellite signals and the calculation of time delays, which are critical for determining accurate geographic coordinates.