Algorithms behind Global Positioning. Murray Grace Josh Collins . Agenda. Global Positioning systems Overview How GPS works Determining position Errors & Error correction Algorithms Routing Other methods of positioning Cell Phone Towers & Wi Fi Features of GPS Location Elevation
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Icons behind GPS invention
Ivan A. Getting
Roger L. Easton
A constellation of 24 Satellites that transmits signals that gives the current GPS position & time
Worldwide control stations to maintain satellite in orbit & adjust satellite clocks
GPS receivers which receive signals from satellite to calculate users position & time
To accurately determine the true location, we can use measurements from a fourth satellite or eliminate one of the 2 points that gives ridiculous answer(may be too far from earth)
Civilian GPS fixes under a clear view of the sky are on average accurate to about 5 meters (16 ft.) horizontally
Fastest Travel Time
If the heuristich satisfiesh(x) ≤ d(x, y) + h(y) for every edge (x, y) of the graph (where d denotes the length of that edge), it is optimal.