Download - Gps mobile based human position (2)
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GPS
G P S 1
LOBAL OSITIONING YSTEMG P S
Prepared by :
FAHADNEHALAMIRADIL
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The Global Positioning System, usually called GPS, is the only fully-
functional satellite navigation system(allow small electronic devices
to determine their location (Longitude,
Latitude, and Altitude) in within a few meters
using time signals
DEFINITION
G P S
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INTRODUCTION
G P S
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HOW TO GET A POSITION
Need signal from at least four SVs for 3D position
One SV provides a time reference
Distance to three remaining SVs is determined by observing the GPS signal travel time from SV to the receiver
With three known points, and distances to each, we can determine the GPS receiver’s position (trilateration)
G P S 4
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The Global Positioning System is a constellation of 31 satellites that is used to calculate your position.
CONSTELLATION
5G P S
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G P S 6
FLOW CHART
GPS Satellite
Broadcast AntennaGPS Receiver
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Fast speed Leads us in right
direction Helps improve
mapping skills Makes navigation
easier
Not very cheap People focus on GPS
more than road which causes accident
Needs good care and handling
External power
G P S 7
DISADVANTAGESADVANTAGES
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The United States Department of Defense developed the system, officially named NAVSTAR GPS (Navigation Signal Timing and Ranging Global Positioning System), and launched the first experimental satellite in 1978.
NAVSTAR
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Sources of Errors
Largest source is due to the atmosphere Atmospheric refraction
Charged particles Water vapor Ionosphere
(Charged Particles)
Troposphere
9G P S
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Other Sources of Errors
Geometry of satellite positions Satellite clock errors SV position or “ephemeris” errors Quality of GPS receiver Multi-path errors
10G P S
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APPLICATION Military. Search and rescue. Disaster relief. Surveying. Marine, aeronautical and terrestrial navigation. Satellite positioning and tracking. Shipping.
11G P S
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G P S 12
GPS LOCATION PRINCIPLE
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Four Basic Functions of GPS
Position and coordinates.
The distance and direction between any two waypoints, or a position and a waypoint.
Travel progress reports.
Accurate time measurement.
13G P S
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GPS TRACKERS
14G P S
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G P S 15
THANK YOU