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seminar surveyer
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Joined: Sep 2010
29-12-2010, 02:20 PM

Submitted By:
Garima Singh

.ppt   PRESENTATION+ON+GPS.ppt (Size: 1.12 MB / Downloads: 49)

Introduction To GPS

GPS is a spaced based radio positioning system, which provide suitably equipped user with highly accurate position, velocity and time data

GPS provide specially coded signals that can be processed in a GPS receiver.
A GPS receiver decodes time signal transmission from multiple satellites and calculated its position.

GPS system was designed & controlled by US military.
The cost of maintaining the system is approximately US $400 million per year including the replacement of aging satellite.

24,900 Miles

1,038 Miles/Hour
1 Day Cycle

1/4 Size of the Earth

Distance from Earth

239,000 Miles

The History of GPS
Feasibility studies begun in 1960’s.
Pentagon appropriates funding in 1973.
First satellite launched in 1978.
System declared fully operational in April, 1995.
Open to the public, 2000.

How does GPS work?
Stations on earth, and a GPS receiver, the distances between each of these points can be calculated.
The distance is calculated based on the amount of time it takes for a radio signal to travel between these points.
Using satellites in the sky, ground allows the GPS receiver to know where you are, in terms of latitude and longitude, on the earth.
The more satellites the GPS can “see”, the more accurate your reading.
The GPS must “see” the satellites, so it does not work well in dense forests, inside caves, underwater, or inside buildings.

GPS Satellites
Distance from Earth
12,000 Miles

2 Orbits in 24 Hours
Travel 7,000 MPH

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