How GPS Works | How GNSS Receivers Determine Your Location Using Satellite Signals?

GPS stands for Global Positioning System, and it helps you know where you are using special satellites far above Earth.

Imagine you have a toy phone that talks to four satellites in the sky, like friends calling out distances. Each satellite says, “I see you, and I’m 10,000 miles away!” Your phone listens carefully and uses those numbers to figure out exactly where you are on Earth, just like how you might use a map and some clues from your friends to find treasure.

Each satellite sends messages that tell your phone two things: what time it is and how far away you are. Your phone compares these times with its own clock. If one satellite says, “You’re 10,000 miles from me,” but another says, “You’re 12,000 miles from me,” your phone can draw circles around both satellites, where the circles meet is probably your location!

Your phone uses messages from at least four satellites to find you in 3D space, like knowing not just where you are on a map, but also how high up you are, like being on a airplane or a building.

Once it knows your position, it can show you directions, tell you the time, or even help your parents track where you went for ice cream!