Here's how it works:
* Satellites: A constellation of at least 24 satellites orbit the Earth at a high altitude. These satellites continuously transmit radio signals containing precise time information and their orbital position.
* Receivers: GPS receivers, like the ones in your phone or car navigation system, pick up these signals from multiple satellites.
* Triangulation: By measuring the time it takes for the signals to reach the receiver, the receiver can calculate the distance to each satellite. Knowing the distance to at least four satellites allows the receiver to pinpoint its location using a process called trilateration (a 3D version of triangulation).
Other satellite navigation systems:
While GPS is the most widely used, there are other similar systems:
* GLONASS (Russia): The Global Navigation Satellite System is a Russian alternative to GPS.
* Galileo (European Union): The European Union's global navigation satellite system.
* BeiDou (China): China's global navigation satellite system.
All of these systems work on the same basic principles, using a network of satellites to provide precise location information.
