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.