Global Positioning System What is GPS ? A very precise positioning system Developed and maintained by the US Department of Defense (DOD) Satellite Based.

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Presentation transcript:

Global Positioning System

What is GPS ? A very precise positioning system Developed and maintained by the US Department of Defense (DOD) Satellite Based * 24 satellites * 20,200 km high orbit

Characteristics of GPS Free Precise Reliable Anytime & anywhere All weather Unlimited user capacity Accurate(precise) Almost!

Segments of GPS 1. Space Segment A constellation of 24 satellites 2. Monitor Station A network of earth-based facilities 3. Users & Equipment Source:Trimble

Segments of GPS Source:Trimble 1. Space Segment A constellation of 24 satellites

GPS Monitoring Station

How GPS Works ……… Uses measurements from 4+ satellites Distance = travel time x speed of light Source:Trimble

Determining GPS Position Suppose the distance from Satellite A to our position is 11,000 miles At this point we could be located anywhere on the specified sphere Satellite A + Next, let us take another measurement from a second satellite, Satellite B Satellite B + Now our position is narrowed down to the intersection of theses two sphere

Satellite C + Determining GPS Position Satellite A Satellite B + + Taking another measurement from a 3 rd satellite narrows our position down even further, to the two points So by ranging from 3 satellites we can narrow our position to just two points in space These points are located where the 3 rd sphere cuts through the the intersection of first two spheres

Three Dimensional (3D) Positioning

Determining GPS Position

Common use of GPS A.GIS data collection & mapping B. Navigation C. Recreation

GPS for Navigation

GPS in recreation

GPS in Farmland

GeoXT Versus Garmin Mostly used for GIS data collection Mostly used for recreational purposes

Websites zpHome.jsp?minisite=10140https://store.trimble.com/OA_HTML/ibeCZ zpHome.jsp?minisite=10140