G lobal P ositioning S ystem Vamshi Linga Clint Reitsma.
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G lobal P ositioning S ystem Vamshi Linga Clint Reitsma
Outline Where it came from How it works Error Correction Galileo and Future Uses
Where it Came From Funded and Controlled by U.S. DOD Originally Designed for the Military 1978 First Block of Satellites launched 1989 Second Block of Satellites launched 1995 Fully Operational Korean Flight 007 Crashed – President Ronald Regan guaranteed all GPS signals would be available to the world
How it works Space Segment Control Segment User Segment
Space Segment Five to Eight Satellites visible at any time Each satellite transmits data including both current location and time Signals move at the speed of light
User Segment Triangulates by measuring distance using the travel time of radio signals –(Velocity)*(Time)=Distance Very accurate time required (Atomic Clocks on Satellites) Along with distance, Satellite position is required Correction of errors
User Segment: Time Star Spangled Banner Example Times are very short (0.06 s) –.001 of second error = 200 miles error –Atomic clocks cost $75,000 –Use a forth Satellite Measurement Pseudo Random Code –Complicated to make unique (not actually random) –Each satellite has own unique code
User Segment: Position Orbits of Satellites are exact and known by receivers (preprogrammed) DOD monitors and updates ephemeris errors (orbit errors) Pseudo Random Code includes navigation message with ephemeris error information
User Segment Perfect ExampleReal Example Corrected Example
Error Correction Differential GPS Cooperation of two receivers –One stationary –One Mobile Stationary Receiver measures timing errors and provides correction –Uses equation backwards –Uses Known position to calculate time
An enabling technology Marine navigation Air Navigation Land navigation Surveying Military applications
Navigation Tracking Bomb and Missile guidance Rescue Facility Management
Navigation Used to reach and destroy vital enemy installations Provides the accurate positional data
Tracking Track potential targets Smart Bombs Time space position information
Missile Guidance Cruise missiles Multiple launched Rocket system Vehicles Reduces the chances of detection and counter Bombardment
Rescue and Facility management Co-Opted with GIS Can help manage and operates large bases which cover extensive areas.
Galileo Project Inter-operable with GPS and GLONASS Under civilian control Four of the first operational satellites will be launched in 2005- 2006 Consists of 30 satellites 23616 km altitude above the Earth Coverage from 2008
Present developments Estimated 3.2 billion Euros Investment for the first quarter Around 1 billion India-350 million Euros China-300 million Euros More than 600 million by ESA
Why does Europe and Asia need Galileo Civilian uses? Geo-political implications?