Group presentation done on GPS technology it covers
1.Introduction -History,Background
2.What is GPS - Technology, infrastructure
3.How GPS Works - Theory,Mathematical explanation
4.Applications of GPS
5.Drawbacks of GPS
6.Future Development
#References are added to the note section of the slides.
3. Content
1. Introduction
2. What is GPS ?
3. How GPS Works
4. Applications of GPS
5. Drawbacks of GPS
6. Future Development
GPS Technology
3
4. Introduction
Navigation in early days
North Star
Compass
LORAN & Decca Navigator
GPS project
Developed under Department of Defense
GPS is not alone
GPS Technology
4
5. What is GPS ?
Global Navigation Satellite System (GNSS)
Provide
Position
Timing
Navigation
Three segments
Space
Control
User
GPS Technology
5
6. What is GPS ? Cont.
Space segment
24 satellites
At least six satellites on LOS
GPS Technology
6
7. What is GPS ? Cont.
Control Segment
Operate by US Air force
Consist of
•
•
•
•
Master Control Segment (MCS)
Alternative MCS
Dedicated ground antennas
Monitoring stations
GPS Technology
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9. What is GPS ? Cont.
User segment
Consist of GPS receivers
Calculate location using GPS signals
GPS Technology
9
10. How GPS Works
Satellite emit two signals
L1 (1575.42 MHz) UHF band – civil use
L2 – (1227.60 MHz) - Military use
Power 50w
CDMA
GPS signal
Pseudo random code
Almanac data
Ephemeris data
GPS Technology
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11. How GPS Works
• Beacon –Radio Signal
• Travel time(t)=Sync of receive time – Satellite Time
•
d=C*t
GPS Technology
11
12. How GPS Works Cont.
Triangulating
GPS Technology
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13. Applications of GPS
GPS is an essential element of the global
information infrastructure
It’s
Free
Open
Dependable
“New uses of GPS are invented every day and
are limited only by the human imagination.”
GPS Technology
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14. Applications of GPS cont.
Aviation
Cost effective solution
Increase the safety and efficiency
Three-dimensional positioning
GPS Technology
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15. Applications of GPS cont.
Space
Navigation solutions
Altitude solutions
Timing solutions & etc.
GPS Technology
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21. Future Development Cont.
L5 “safety-of-life” signal
Two times powerful as L2C
Focus on aviation & transportation
Resistant to jamming & interference
High gain directional antenna
100 times more powerful than wide angle
antenna
M-coded military signal
GPS Technology
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22. Future Development Cont.
Cross platform receivers
More accurate
Fast convergence
GPS & GLONASS satellites
GPS Technology
22
http://www.slideshare.net/maggiearya/gps-20816234 - slide 5,6LORAN & Deca - ground-based radio-navigation systems, such as LORAN and the Decca Navigator, developed in the early 1940s and used by the British Royal Navy during World War II.The GPS project was developed in 1973 to overcome the limitations of previous navigation systems. It became fully operational in 1995. intended to military use later became publically available In addition to GPS, other systems are in use or under development. The Russian Global Navigation Satellite System (GLONASS) There are also the planned European Union Galileo positioning system, Chinese Compass navigation system.
http://www.gps.gov/systems/gps/space/The GPS space segment consists of a constellation of satellites transmitting radio signals to users.GPS satellites fly in medium Earth orbit (MEO) at an altitude of approximately 20,200 km. Each satellite circles the Earth twice a dayhttp://en.wikipedia.org/wiki/Global_Positioning_System#Space_segmentAs of December 2012,[65] there are 32 satellites in the GPS constellation.