gps jovince
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Global Positioning System
By JOVINCE JOHN
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Global Positioning Systems
GPS is a revolutionary navigation system
24 satellites orbiting the earth
Provide location within metres or less anywhere on
the globe.
Now available in many cars as an option
Created and operated by the US Department of is theshortened form of NAVSTAR GPS.
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More about GPS satellites
Constellation of 27 satellites
(24 active + 3 spare)
Orbit 12,600 miles above earth
(10,900 nautical miles)
Satellites in 12 hour orbit
First satellite launched in 1978, 24th became operational
in 1994
Selective availability was removed in May, 2000
Handheld receivers are now much more accurate
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How does GPS work?
Measuring distance by measuring time
Satellites send coded signals indicating their position
in space and the exact time the signals are being sent
Receivers use the time it takes signal to travel from
satellite to receiver to determine distance fromsatellite to receiver
Information from multiple satellites is used to
determine position through triangulation
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How does GPS work?
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time difference
pseudo-random
code generated
by GPS receiveron the ground
pseudo-randomcode generated
by GPS satellite
in space
The GPS receiver and satellite generate the same pseudo-random code at
exactly the same time. When the code arrives from the satellite, the timedifference is compared to the same code generated by the receiver. This
difference is multiplied by the speed of light (186,000 miles per second) to
determine the distance to the satellite.
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More about GPS receivers
A GPS receiver's job is to locate four
or more satellites, figure out the
distance to each, and use this
information to deduce its own
location.
Hand-held receivers for recreational use
with accuracy of 10-15 metres
Vehicle mounted receivers for navigation
or agricultural use with accuracy of < 1
metre
Backpack or tripod mounted receivers for
surveying use with accuracy of 5 10
centimetres
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More about GPS receivers
Receivers require clear line-of-sight; thus, they will not
work indoors or where tall objects obscure the sky
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Whats so cool about GPS?
GPS units
Can be used as a digital compass
Can store landmarks (locations)
Can be used for dynamic routing
Can be used for mapping applications
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System Overview:System Overview:
The total GPS configuration is comprised of three distinctThe total GPS configuration is comprised of three distinct
segmentssegments
(1) The space segment(1) The space segment--Satellites orbiting the EarthSatellites orbiting the Earth
(2) The control segment(2) The control segment--Stations positioned on the EarthsStations positioned on the Earths
equator to control the satellites.equator to control the satellites.
(3) The user segment(3) The user segment Anybody that receives and uses theAnybody that receives and uses the
GPS signal.GPS signal.
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Applications of GPS
In-vehicle Navigation (car, boat, airplane)
Asset Management
Construction
Geologic Research & Mining
Military Navigation and Operations
Mapping & Surveying
Precision Agriculture
Public Health
Public Safety
Wireless Communications
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Conclusion
GPS was originally designed for military use at
any time, anywhere on the surface of the earth.
The civilians may also use GPS to marine navigation,
car navigation and surveying.
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Queries .
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ThAnk yOU
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