Kritagya Raj Upadhyay

BIM ‘A’ 1st Sem

118

GPS(Global Positioning System)Technology

Computer Information System

CONTENTS

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• Introduction of GPS

• History

• How does GPS works?

• Usefulness of GPS

GPS

INTRODUCTION OF ‘GPS’

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•Space-based.

•Global navigation satellite system.

•Constellation of 24 satellites

and their ground stations.

•Provides location and time

information.

•Maintained by U.S Govt.

•Freely accessible.GPS

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HISTORY

GPS

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Developed in 1973.

U.S (DoD) for military had to have a precise form of worldwide positioning.

Became fully operated

in 1994.

GPS

HOW DOES GPS WORKS ?

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GPS works in six logical steps:

1.The basis of GPS is ‘triangulation’ from satellites.

2.To ‘triangulate’, a GPS receiver measures distance using the travel time of radio signals.

3.To measure travel time, GPS needs very accurate timing.

4.Along with distance, GPS needs to know exactly where the satellites are in space.

5.GPS must correct for any delays the signal experiences as it travels through the atmosphere.

6.Finally (for us), we can now obtain the precise time and location from the GPS satellites.

GPS

USEFULNESS OF GPS

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• Provides critical capabilities to military, civil and commercial users around the world.

• Maintains future warfighter advantage over opponents. • Being used now in cell phones as a popular application to

implement the emergency (‘911’) location system.• Calculates the speed and compass heading of the person

or craft carrying it.• Modernizing the global

air traffic system.• Used on boats, ships, airplanes,

cars, and ambulances as well as

by hikers, explorers and

mountain climbers.GPS

LAUNCHING A GPS SATELLITE04/10/2311 GPS

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Thank – You

Any questions ???

GPS