GLOBAL POSITIONING SYSTEM
The Global Positioning System (GPS) also called NAVSTAR is a satellite-based navigation system made up of at least 24 satellites. The U.S. Department of Defense (USDOD) originally put the satellites into space for military use, yet they were made accessible for civilian use in the 1980s. It is comprised of satellites, ground stations, and receivers. These satellites can tell the exact location where someone is situated. GPS works in any climate conditions, anyplace on the planet, with no subscription fees or setup charges
HOW GPS WORKS
Earth is surrounded by navigation satellites. Over 30 navigation satellites are zipping around high on the top of the Earth. GPS satellites encircle the Earth two times a day in a precise path. Every satellite sends a unique signal and orbital specifications that allow GPS devices to interpret and figure out the actual position of the satellite. …show more content…
The receiver gets a signal from the satellite. Then the satellites transmit the exact time the signals are sent. By deducting the time, the signal was sent from the time it was received, the system can tell how distant it is from each satellite. It also knows the exact position in the sky of the satellites, now they sent their signals. So, given the travel time of the GPS signals from three satellites and their exact position in the sky, the GPS receiver can determine the position in three dimensions - east, north and altitude.
There is a complexity. To calculate the time the GPS signals took to arrive, the GPS receiver needs to know the time very accurately. The GPS satellites have atomic clocks that keep very accurate time, but it's not possible to prepare a GPS receiver with an atomic clock. However, if the GPS receiver uses the signal from a fourth satellite it can solve the problem that lets it determine the accurate time, without an atomic
The Global Positioning System (GPS) also called NAVSTAR is a satellite-based navigation system made up of at least 24 satellites. The U.S. Department of Defense (USDOD) originally put the satellites into space for military use, yet they were made accessible for civilian use in the 1980s. It is comprised of satellites, ground stations, and receivers. These satellites can tell the exact location where someone is situated. GPS works in any climate conditions, anyplace on the planet, with no subscription fees or setup charges
HOW GPS WORKS
Earth is surrounded by navigation satellites. Over 30 navigation satellites are zipping around high on the top of the Earth. GPS satellites encircle the Earth two times a day in a precise path. Every satellite sends a unique signal and orbital specifications that allow GPS devices to interpret and figure out the actual position of the satellite. …show more content…
The receiver gets a signal from the satellite. Then the satellites transmit the exact time the signals are sent. By deducting the time, the signal was sent from the time it was received, the system can tell how distant it is from each satellite. It also knows the exact position in the sky of the satellites, now they sent their signals. So, given the travel time of the GPS signals from three satellites and their exact position in the sky, the GPS receiver can determine the position in three dimensions - east, north and altitude.
There is a complexity. To calculate the time the GPS signals took to arrive, the GPS receiver needs to know the time very accurately. The GPS satellites have atomic clocks that keep very accurate time, but it's not possible to prepare a GPS receiver with an atomic clock. However, if the GPS receiver uses the signal from a fourth satellite it can solve the problem that lets it determine the accurate time, without an atomic