This presentation discusses the history, functions, applications, advantages and disadvantages of GPS technology. It explains that GPS was developed by the US Department of Defense and MIT for military use starting in 1978. It functions by using trilateration to determine location based on signals from multiple satellites. Applications include social uses like navigation and telecommunications as well as military, aviation and scientific uses. Advantages include portability and usefulness for navigation, while disadvantages include potential signal blockage, high costs and limited battery life.

1. IT Presentation
IT innovation------ GPS
Jasmine Che
Shirley Wan
Sunyan

2. Project Work Flow & Job
Division
Learn the IT skills
Decide a topic Combine all the
e.g. using different
parts done before
that we are software to collect
together, as well as
interested data and
with more analysis
information
Jasmine: Finding information about History of GPS
Shirley: Finding “ Applications ”and “Advantages and
Disadvantages ”
Sunyan: Handling survey and data

3. Objective
• How GPS work
• Discover how GPS technology changes human lives
• What are the daily life application of GPS
• What are the benefits and shortcoming

4. History
• The Global Positioning System (GPS) was developed by :
the U. S. Department of Defense (DOD),
Ivan Getting
the Massachusetts Institute of Technology (MIT).
• Originally consisting of 11 orbiting satellites
• the GPS--official name: NAVSTAR (Navigation System with Timing And Ranging)
• was launched by DOD in 1978 strictly
• for military use

5. 1957 Additional inspiration for the GPS system came when the
Soviet Union launched the first Sputnik
1960 The first satellite navigation system, Transit, was used by the
United States Navy and was first successfully tested
1967 the U.S. Navy developed the Timation satellite which proved the
ability to place accurate clocks in space, a technology the GPS
system relies upon.
1970s, the ground-based Omega Navigation System, based on signal
phase comparison, became the first world-wide radio navigation
system.
1978 The first experimental Block-I GPS satellite was launched in
February 1978. The GPS satellites were initially manufactured by
Rockwell International and are now manufactured by Lockheed
Martin.

7. Survey
Importance of mobile phone
120
100
80
Marks
60
40
20
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
When 100 is full marks, most respondents ranked the importance
of mobile phone as 80 marks or above.

8. How GPS function?
• They work on a very simple principal called
trilateration.
• GPS is really a group of 27 Earth-orbiting satellites in
geostationary orbit 12,000 miles above earth
http://www.youtube.com/watch?v=DCdsGRLo
H5E

9. Applications
Social Military
Aircraft Tectonic
Telecommunication Navigation Navigation
path analysis

10. Social Application
• Telecommunication: GPS is widely used in our mobile phone
and computer, for example, the phone can show the routes
which can arrive to the destination with Automotive
navigation system
• Navigation: GPS has been adopted on some cargo in order to
measure the velocity and locate the orientation.

11. • Aircraft path: Some data, e.g. the speed, direction
and the altitude will be recorded and reported.
• Tectonic analysis: With GPS technology, we can measure the
faulting activities directly.
Military application
• Navigation: The soldier can find the object they need and
gather at a specific location even though they are in the dark.
http://www.youtube.com/watch?v=DCdsGRLoH5E

12. Advantages
• Very handy: widely applicable
• Good use on water navigation: would not obstruct the
reception of signal
• Useful application on science: detect the destructed
building and roads damaged
• Benefit in Business: entrepreneur can keep their eyes on
the business closely
• Making map: we can modify the map easily

13. Disadvantages
• Possible Failures: Tall building will block the satellite
signal. It may prevent you from receiving the position
correctly.
• The cost is expensive: The cost of some high technology
GPS with accurate locating function and updating
information would be very expensive.
• Short battery life: Since this system depends on the
electricity from battery, the electricity will drain after a
period of time.