The document provides an overview of the Global Positioning System (GPS). It discusses the history and development of GPS from 1969 to 1995. It describes the three segments that make up the GPS architecture: the space segment consisting of 24 satellites, the control segment of earth-based stations, and the user segment of any device receiving GPS signals. It then explains how GPS works by using triangulation of signals from three or more satellites to calculate a user's position and discusses applications such as vehicle navigation, mapping, and tracking stolen devices. Advantages listed include usability in all weather and coverage of the entire planet. The conclusion discusses expanding civilian uses of GPS for navigation and future autonomous vehicles.

2. CONTENTS
Introduction
History
GPS Architecture
Working of GPS
Applications
Advantages
Extent of using GPS
Conclusion

3. INTRODUCTION
The Global Positioning System (GPS) is a
satellite-based navigation system made up of a
network of 24 satellites placed into orbit by the
U.S. Department of Defense.
GPS satellites also called NAVSTAR.NAVSTAR
stands for Navigation Satellite Tim
-ing and RangingSystem.GPS provides
location and time information of targ
-eted person in all weather condition
at any where ,24 hours a day.

4. HISTORY
• 1969—Defense Navigation Satellite System
(DNSS) formed.
• 1973—NAVSTAR Global Positioning System
developed.
• 1978—first 4 satellites launched.
• 1993—24th satellite launched; initial operational
capability.
• 1995—full operational capability.
• May 2000—Military accuracy available to all
users.

5. GPS ARCHITECTURE
The GPS Architecture is divided into three segments
 The Space Segment
 The Control Segment
 The User Segment
1.The Space Segment:-This segment specifies
satellites orbiting the Earth.

6. 2.The control segment:-It specifies Stations
positioned on the Earth’s equator to control the
satellites.
3.The user segment :- Anybody that receives and
uses the GPS signal.

7. WORKING OF GLOBAL
POSITIONING SYSTEM
 GPS satellites circle the earth twice a day in a
very precise orbit and transmit signal information
to earth.
GPS receivers take this information and use
triangulation to calculate the user's exact location.
GPS receiver compares the time at signal was
transmitted by a satellite with the time when it was
received user's position and display it on the unit's
electronic map.

8. Fig:Working of GPS
 A GPS receiver must be locked on to the signal
of at least three satellites to calculate a 2D
position (latitude and longitude) and 3D position.

9. APPLICATIONS
In-vehicle Navigation (car, boat, airplane)
Geologic Research & Mining
Military Navigation and Operations
Mapping & Surveying
Precision Agriculture
Public Health, Public Safety
Weather Forcasting
Wireless Communications
Automobile manufacturers are offering moving-
map displays guided by GPS receivers as an
option on new vehicles.

11. ADVANTAGES
Easy to navigate
GPS works in all weather conditions.
100% coverage on the planet.
Easy to integrate into other technologies like Cell
phone.
Best navigating system in water.
 Recover stolen car and other electronic devices.
Helps in monitoring earthquake ,tsunami
predictions around the world.

12. EXTENT OF USING GPS
This Pie chart shows usage of Global Positioning
System.

13. COCLUSION
Previously this service of GPS was confined only
the military and law enforcements agencies , but
now this is a extended for civilian.GPS provided
good substitute for route mapping in navigation.
GPS has truly helped man to advance in more
ways than one.It is also going to bring a great
revolution by its development.The future will
hold a lot more surprises. Automobiles are tested
on moving on their own without the assistance of
a driver.