global positioning system presented by: prateek rastogi (05it6013)
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Global Positioning System
Presented by:
Prateek Rastogi
(05IT6013)
What is GPS?
Global Positioning System.
System to Identify the Position on Globe.
Network Of Satellites.
Segments Of GPS
The Space Segment
The Control Segment
The User Segment
The Space SegmentConsists of 24 satellites in 6 orbits.
Each satellites transmits low powered radio signals.
GPS SatelliteName : NAVSTAR
Altitude : 11,000 miles
Inclination : 55 Deg to the Equator
Weight : 863 Kg(in orbit)
Orbital Period :12 hrs
The Control SegmentA Master Control Station
Unmanned Monitor Stations
Large Ground-antenna Stations
The User SegmentUsers-Military and Civilians
GPS ReceiversDecodes the signals from Satellites.Calculate the distance.
Modes of OperationStandard Positioning System
Data Transmitted on L1 Frequency
For civil users
Accuracy is degraded
Precise Positioning SystemData Transmitted on L1 and L2 Frequencies
For Military users
Highly Accurate
HA=100m
VA=156m
TA=340ns
HA=22m
VA=27.7m
TA=200ns
Signals from GPS
Coarse/Acquisition- To determine Pseudo range
1023 bit long
1.023Mega-bits per sec
P Code2.3547*10^14 bit long
10.23 Mega-bits per sec
Navigation Massage
Working Of GPS
How User Segment calculates the position?
Calculation of Position Satellites Location
Almanac data
Ephemeris
Time is the essenceVelocity * Time=distance
Determination of PositionTrilateration
Sources of Errors
Ionosphere Delays
Troposphere Delays
Clock Error
Multi-path Error
Relativity Error
Correction of Errors
Error ModelingMathematical Model
Data Frequency MeasurementCompare the Delays of L1 and L2
ApplicationsIndustry
Agriculture
Mapping & GIS Data Collection
Public safety
Surveying
Telecommunication
Application Contd…..Military
Intelligence & Target Location
Navigation
Weapon Aiming &Guidance
TransportationAviation
Fleet Tracking
Marine
Application Contd…
Science
Archaeology
Atmospheric Science
Environmental
Geology & Geophysics
Oceanography
Wildlife
Referenceswww.trimble.com
GPS primer “A Student Guide”(Aerospace Corporation)
An Introduction – Global Positioning system S. K. Upadhyaya, G. S. Pettygrove, J.W. Oliveira, B. R. Jahn1
GPS Guide for Beginners(GARMIN Corporation)
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