How does satellites work on a gps

Once the signals have been isolated, the receiver can decode them and split them into individual frequencies. With this information the receiver produces a general position latitude, longitude, and height for the antenna. Later, the data collected by the receiver can be processed again by scientists to determine different things, including another set of position coordinates for the same antenna, this time with millimeter accuracy.

The third part of the system is the data center. The role of the data center is two fold. It both monitors and controls the global GPS stations, and it uses automated computer systems to retrieve and analyze data from the receivers at those stations. Once processed, the data , along with the original raw data, is made available to scientists around the world for use in a variety of applications. Since global GPS sites are constructed and monitored by different institutions all over the world, there are many different data center locations.

What is GPS? Website host: NOAA. Privacy policy. This page was last modified on February 22, For the desktop version of this page, rotate your device to landscape. Skip to content GPS. GOV Official U. Space Segment The space segment consists of a nominal constellation of 24 operating satellites that transmit one-way signals that give the current GPS satellite position and time.

Learn more Control Segment The control segment consists of worldwide monitor and control stations that maintain the satellites in their proper orbits through occasional command maneuvers, and adjust the satellite clocks. The ancient sailors of history would be flabbergasted by the speed and ease of pinpointing your location today. The Short Answer:. We know where they are because they constantly send out signals.

A GPS receiver in your phone listens for these signals. Once the receiver calculates its distance from four or more GPS satellites, it can figure out where you are. Earth is surrounded by navigation satellites. Credit: NOAA. GPS can be used to keep an eye on dangerous natural hazards, too! Tsunamis GPS can help provide early warning of tsunamis. Credit: mnlamberson.