We think of a satellite being a certain height over ... Of course, many people worked on GPS — known as NAVSTAR at its inception. It wasn’t even the first system of its kind.

M-Code is designed to give military receivers better defense against jamming, operate in dense vegetation, enhance their ability to track the GPS satellites ... flexible implementation of the ...

There are currently two satellite-based navigation systems deployed, the American controlled system known as GPS or Navstar and the Russian system GLONASS. There are a number of similarities between ...