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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