Psst! This Note's for You
Broadcast from a fleet of orbiting satellites, Global Position Satellite (GPS) signals bathe the earth. These signals are detected by handheld GPS receivers. Each unit analyzes the detected signals, calculating the travel time between satellite and ground. From this data, the unit determines the distance to each satellite. These distances are triangulated and their point of overlap is identified as the receiver's ground position.
published online February 1, 2003
After you log in, you'll remain logged in on this computer for up to three months, or until you click the Log Out button at the top of the page.
