Everything You Need to Know About GPS

What is GPS? ,[object Object],[object Object],[object Object],[object Object],[object Object]

GPS Satellites ,[object Object],

Receivers and Satellites ,[object Object]

GPS Signals ,[object Object],Physically the signal is just a complicated digital code, or in other words, a complicated sequence of “on” and “off” pulses.

Time Difference ,[object Object]

Calculating Distance ,[object Object],Radio waves travel at the speed of light, roughly 186,000 miles per second (mps) If it took 0.06 seconds to receive a signal transmitted by a satellite floating directly overhead, use this formula to find your distance from the satellite. 186,000 mps x 0.06 seconds = 11,160 miles

Triangulation ,[object Object],[object Object]

3-D Trilateration 1 Satellite 2 Satellites 3 Satellites

Atomic Clocks ,[object Object]

Line of Sight Transmissions ,[object Object],Obstructions such as trees, buildings, or natural formations may prevent clear line of sight.

Light Refraction ,[object Object],[object Object]

Signal Refraction ,[object Object]

Signal Interference ,[object Object]

Satellite Distribution ,[object Object]

PDOP ,[object Object],PDOP = Positional Dilution of Precision 11,000 miles 11,000 miles 11,000 miles 11,000 miles ,[object Object],[object Object],[object Object]

Differential Correction ,[object Object],ISU Base Station - http://134.50.65.125/

Postprocessing / Real-time Before After

Latitude and Longitude ,[object Object]

Waypoints ,[object Object],Or more usually, waypoints may be entered directly by taking a reading with the unit at the location itself, giving it a name, and then saving the point. Latitude and Longitude Your location Direction of waypoint Date and Time Waypoint

Data Dictionary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Roving File ,[object Object],Collect all the features collected in one interval in one roving file. Road Signs Fire Hydrants Macro Art

GPS Uses ,[object Object],[object Object],[object Object],[object Object]

Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Everything You Need to Know About GPS

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