GPS has evolved since its development in the 1970s by the US Department of Defense. It was originally intended for military use but has grown to support many civilian applications. GPS uses a constellation of satellites that transmit timing and location data to receivers, which use triangulation to calculate the user's precise position. It has applications in navigation, tracking, emergency services, and more. A survey found that while GPS is commonly used for transportation, respondents felt it could benefit other sectors as well and its future trends are promising. However, some have privacy concerns about its growing use.

1. Cheung Ki Yan (Wissely) 13214993
Cheung Chi Ki (Kathy)
13212907
Cheung Pak Yeung (Vision) 13205404
24 October 2013

2. • To enhance understanding about GPS
 Background
 How it work
 Application
• To evaluate its potential benefit & harm
• To analysis people’s view on GPS
(Survey result )

4. • What are uses of GPS you can think of?

5. Early 70’s
GPS project
was
developed
(US
Department
of Defense)
1995
Experimental
blocks of
satellites
70’s - 80’s
24 Satellite
constellation
in orbit
1994
Full
Operational
Capability
(FOC)
GPS on
mobile
phones
2004

6. VS

7. Applicable
✔
✔
×
COST

9. Transmit information
- Time
- Location
Satellite circle the earth
Triangulation
Receivers use -Identify
triangulation to positions by
calculate the user's
distance and
exact location. angle

10. 
GPS: Very small clock error, results in a large position
error
◦ Receivers use four or more satellites to solve for x, y, z, and t

12. Space Segment
• Transmit radionavigation
signals
• Store &
retransmit the
navigation
message sent by
the Control
Segment
Control Segment
• Track the GPS
satellites
• Monitor
transmissions
• Perform
analyses
User Segment
• Receive GPS
signals
• Determine
pseudoranges
• Solve
navigation
equation

15. Navigation
Tracking

16. •
•
•
•
Location
Direction
Speed
Arriving Time
Monitor &Provide
Warning about
potential dangerous

17. Comprehensive safety net
Send S.O.S.
messages
Never get lost
in remote
areas beyond
the range of
cellular
phones

18. Hiking
Outdoor Adventure

20. Efficient &Effective
Provide highly accurate
location
Provide clear direction &
distance of destination
High Availability
- Be used at anytime
Enhance public safety
No cost involved
Poor reception in some
areas
Interfere one’s privacy

21. • Objectives:
- More resources should be put in GPS development &
promotion
 Bring much convenience & advantages to users in
different sectors
 Can be used in different sectors

22. Number of
Respondents:
Channel
68 (Mainly teenagers)
Number of
Questions
Type
13
Facebook
MC (Mainly)
Site: http://goo.gl/qoMeaX

23. Age of Respondents
Below 15
2%
25-35
13%
36-45
3%
16-25
76%
Others:
8%
Above 45
6%

24. Experience of using GPS
Yes
No
23
45

25. Benefits of using GPS in different aspects
Entertainment
Travelling
Business
At work / school
27
18
8
11
1 2
2
1 1
3
1 1
Provide clear
direction and High Availability
Save time / Fast
(Be used at
distance of
Speed
anytime)
destination
0 1 0 1
Others:

26. Willingness to recommend others
Yes
98%
No
2%

27. Confidence on Future Trend
Yes
No
Yes
No
2
43

28. Attitudes on GPS influence in differnt sectors
Very agree
Agree
Neutral
Disagree
Very disagree
30
26
22
11
21
16 16
13
8
19
16
20
17
10
9
00
17
01
3
0
9
7
00
10
4
4
0
4
7
22

29. Consistent with objectives:
• More resources should be put in GPS development
Popular
People have confident toward its future development
Can be applied in different sectors
• More resources should be put in GPS promotion
 Mainly used as transportation purpose

31. • GPS has been evolving through time
• Help in the navigation, military, transportation and
emergency fields
• Originally designed for military purposes
• The civil applications have grown faster
• GPS has replaced the conventional methods
– Cost effective process, time saving, accuracy and
rapidness

33.  Kaplan, E. D., & Hegarty, C. (2006). Understanding GPS: Principles and
applications. Boston: Artech House.
 Xu, G., 1953, SpringerLink (Online service), & Springer-Verlag. (2007). GPS:
Theory, algorithms, and applications. Berlin, Heidelberg: Springer-Verlag
Berlin Heidelberg.
 El-Rabbany, A. (2002). Introduction to GPS: The global positioning system.
Boston, MA: Artech House.
 Leick, A., & Lambert, S. (1990). GPS satellite surveying. New York: Wiley.
 Gps application raises privacy flag. (2001, ). Global Positioning & Navigation
News, pp. 1.
 Vehicle navigation dominates the GPS application market. (2012, ). M2
Presswire
 James, R. (2009). A brief history of: GPS. New York: Time Incorporated.
 Charles Plueddeman. (1999). GPS mapping. New York: Bonnier Corporation.