Global Positioning System is, without a doubt, one of the most useful inventions of the late 20th century. It made it significantly easier for ships, airplanes, cars, and hikers to figure out where they are with high degree of accuracy.

However, the satellites are just a part of what makes GPS possible. While I’ll discuss their motion in depth, over the course of this blog post I’ll also explain how the satellites help a GPS receiver determine where it is, and I’ll dive into the clever methods the system uses to make sure the signals sent all the way from space are reliably decoded on Earth.

We’ll start by creating a positioning system that can tell us where we are. Our initial approach will be quite simple, but we’ll step-by-step improve upon it to build an understanding of the positioning method used by GPS.

Awesome explanation about GPS. I am a big fan of Bartosz Ciechanowski work, his explanations are clear and have cool interactive examples.