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G.P.S
GLOBAL POSITIONING SYSTEM
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GLOBAL POSITIONING SYSTEM
GPS, which stands for Global Positioning System, is the
only system today able to show you your exact
position on the Earth anytime, in any weather,
anywhere.
The three parts of GPS are:
Satellites
ReceiversSoftware
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GPS SATELLITES
The GPS OperationalConstellation consists of 24satellites that orbit the Earth invery precise orbits twice a day.
GPS satellites emit continuousnavigation signals.
They are used for a wide rangeof purposes: satellite TV,cellular phones, military
purposes and etc. Satellites canalso be used by GPS receivers.
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RECEIVERS AND SATELLITES
GPS units are made to
communicate with GPS
satellites to find out
exactly where they are on
the global scale of things.
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Velocity x Time = DistanceVelocity x Time = Distance
The GPS receivercompares the time a
signal was transmitted by
a satellite with the time it
was received. The time
difference tells the GPS
receiver how far away the
satellite is.
CALCULATING DISTANCE
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Physically the signal is just a
complicated digital code, or inother words, a complicated
sequence of on and off
pulses.
Physically the signal is just a
complicated digital code, or inother words, a complicated
sequence of on and off
pulses.
Each GPS satellite
transmits data that
indicates its location
and the current time.
All GPS satellites
synchronize operations
so that these repeating
signals are transmitted
at the same instant.
GPS SIGNALS
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WORKING PRINCIPLE
Spheres created by satellites.
Calculating position using multiplespheres.
The spheres created by the different
transmitting signals helps to find the
actual position of the receiving device.
Alignment of the spheres with the earth.
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G.P.S. DEVICES
Mobile Phones
Smart Phones
G.P.S. Hardware
G.P.S. in cars
G.P.S. satellites
G.P.S. tracking
device
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APPLICATIONS
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SIGNAL PROCESSING UNITS
A typical GPS receiver with
integrated antenna.
A G.P.S. receiver module measuring
15*17mm
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PROBLEMS
Line of Sight Transmissions
Signal Refraction
Signal Interference
Satellite Distribution
PDOP = Positional Dilution of Precision
Differential Correction
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USES
Various devices used in dailylife uses G.P.S.
G.P.S. communication used in
ships
G.P.S. available in many
mobile phones
Popularity of G.P.S. in films
G.P.S. tracker
Map makers
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