global positioning system (gps)
DESCRIPTION
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.TRANSCRIPT
GPS Technology 1
Global Positioning System(GPS)
WDN PresentationCSN - SLIIT
GPS Technology 2
Team Members
1. Sachin Thishnika
2. Kusal Indika
3. Vidusha Rathnayaka
4. Nadeendra Yashaswin
5. Janaka Poddalgoda (Absent)
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Content
1. Introduction
2. What is GPS ?
3. How GPS Works
4. Applications of GPS
5. Drawbacks of GPS
6. Future Development
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Introduction
Navigation in early days North Star Compass LORAN & Decca Navigator
GPS project Developed under Department of
Defense
GPS is not alone
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What is GPS ?Global Navigation Satellite System
(GNSS)Provide
Position Timing Navigation
Three segments Space Control User
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What is GPS ? Cont.
Space segment 24 satellites At least six satellites on LOS
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What is GPS ? Cont.
Control Segment
Operate by US Air force
Consist of• Master Control Segment (MCS)• Alternative MCS• Dedicated ground antennas• Monitoring stations
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What is GPS ? Cont.
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What is GPS ? Cont.
User segment Consist of GPS receivers Calculate location using GPS signals
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How GPS WorksSatellite 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
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How GPS Works
• Beacon –Radio Signal
• Travel time(t)=Sync of receive time – Satellite Time
• d=C*t
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How GPS Works Cont.
Triangulating
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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.”
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Applications of GPS cont.
Aviation Cost effective solution Increase the safety and efficiency Three-dimensional positioning
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Applications of GPS cont.
Space Navigation solutions Altitude solutions Timing solutions & etc.
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Applications of GPS cont.
Survey & mapping Accuracy Reliability Interoperability
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Applications of GPS cont.
Differential GPS 10 meters to 10 centimeters Base station in known location Real-time DGPS
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Drawbacks of GPS
Signal multipath
Atmospheric effect
No GPS signals in Indoor Under water Under ground
Attacks
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Future Development
GPS III Enhanced signal reliability & accuracy L1C signal L2C signal Schedule to launch in 2015
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Future Development Cont.
No Selective Availability (SA)
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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
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Future Development Cont.
Cross platform receivers More accurate Fast convergence
GPS & GLONASS satellites
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