Can someone explain How GPS works?

Answer 1

There are three standard orbits for GPS satellites, and each orbit has four satellites spaced at regular intervals on the orbit. The orbits are chosen so that every point on earth will always have at least three GPS satellites above the horizon at the same time.

Each satellite has a super-accurate atomic clock on board, and each satellite broadcasts time signals to the ground continuously, as well as an identification signal for that particular satellite.

Your GPS receiver in your car (or boat or plane) receives signals from three or more satellites; and it is also programmed with the orbital parameters for the orbits. Your receiver compares the time signals from the satellites overhead and notes the time differences between the arrival times of each satellite's time signal.

Since the signals are broadcast simultaneously (thanks to the atomic clocks on board), the time differences at the receiver are due to the differences in distance travelled by the radio signal from each satellite. The receiver compares the differences and uses that, along with the known orbits of the satellites, to compute your position on earth.

Answer 2

I'm no expert, but it uses signals from satellites to triangulate it's exact position. The signals from the satellites are received at different times depending on the distance from them. By measuring the difference in time, the computer can calculate how far the unit is from each satellite, and then the computer does the math to calculate it's exact position on earth. Imagine a funky shaped pyramid with a triangle base. If you add a stick of any length to each point of the base, eventually those three sticks will meet at only one point. The GPS' function is to measure the length of those 'sticks' to determine the position of that one point.

Answer 3

The basic idea is that your receiver calculates how long it takes to receive signals from one or more satellites. The receiver can calculate a unique position using a process called triangulation if it gets enough data.

You can try this yourself using a paper map. Pick a location, then pick three fixed points. Measure the distance from your location to those three fixed points (straight lines). There is NOWHERE else on the map you can be that has the same distance (in straight lines) to those three fixed points.

Answer 4

Three separate satelites signals are used. Each satellite sends a signal at a precise and co-ordinate time. Your receiver measures the time it takes for rach signal to arrive and tehn it computes how far away you are from each signal. Three sources triangulates your precise position within, I believe, nine feet.
Dan.

Answer 5

temporarily, each and every fleet vehicle has a different identification and GPS gadget the gadget gets its region from the satellite tv for pc it communicates region to a server via the two satellite tv for pc or cellular communique the server places this info (identification and placement) in a geographic database the database feeds a mapping application with the places of the automobiles.

Answer 6

it picks up signals from satellites that are used to triangulate your position

it usually requires at least 3 satellites to track in order to get an accurate position

http://en.wikipedia.org/wiki/Gps
has more detailed info

Answer 7

fairly simple the signal goes to a positioning satelite in space then returns a position to you for the signals origin

Answer 8

RF triangulation

Answer 9

Cartesian coordinates

Answer 10

With satellites