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Information about GPS

Published on February 20, 2009

Author: sagarvtk


Principles of Global Positioning Systems and Its Applications : Principles of Global Positioning Systems and Its Applications Slide 2: Introduction The global positioning system(GPS) is a network of 24 NAVSTAR satellites orbiting at a distance of 20,200kms from the surface of the earth . Originally established by the u.s department of defense(DOD). The system”s positioning and timing data are used for a variety of applications, including air,land and sea navigation, vehicle and vessel tracking,surveying and mapping ,asset and natural Resource management. GPS is the shortened form of NAVSTAR GPS. This is an acronym for Navigationsystem with Time and Ranging. Slide 3: Historical Development of GPS 1978 -Launch of first GPS satellite1985 -Kinematic GPS surveying1989 -Launch of first Block II satellite Wide area differential GPs concept U.S Coast Guard GPSInformation System (GPSIC)1993 -Real-time Kinematic GPS Initial operational capability (IOC)on December 8.1995 -Full operational capability (FOC) on July 171996 -Presendential Decision Directive, first U.S GPS policy2000 - Selective availability set to Zero . Slide 4: Satellites orbiting the Earth Slide 5: System Overview: The total GPS configuration is comprised of three distinct segments (1) The space segment-Satellites orbiting the Earth (2) The control segment-Stations positioned on the Earth’s equator to control the satellites. (3) The user segment – Anybody that receives and uses the GPS signal. Basic principles of GPS : Basic principles of GPS Resection Four unknowns Calculating the distance to the satellite Calculating time Errors and precision : Errors and precision Ionospheric and atmospheric delays Satellite and Receiver clock errors Dilution of precision Multipath Blenders Factors affecting accuracy : Factors affecting accuracy Number of visible satellites Position dilution of precision Satellite elevations Multipath Distance between space station and rover receivers Differentially corrected positionsDGPS : Differentially corrected positionsDGPS Surveying with GPS : Surveying with GPS Advantages using GPS Limitations of GPS Uses of GPS technology Uses of GPS technology : Uses of GPS technology Location - Determine a basic position Navigation - Getting from one location to another Tracking-Monitoring the movement of people and things Mapping-Creating maps Timing-Providing precise timing Competitors of GPS : Competitors of GPS GLONASS - Russian Federation’s satellite navigation system Galileo -European Union and the European Space Agency Slide 14: A GPS Signal contains three different bits of information (1).Pseudo random code (2).Ephemeris data (3).Almanac data Slide 15: Conclusion GPS was originally designed for military use at any time, anywhere on the surface of the earth. The civilians may also use GPS to marine navigation, car navigation and surveying. THANK YOU : THANK YOU

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