31-05-2012, 05:21 PM
Global Positioning System
Global Positioning System2.ppt (Size: 619.5 KB / Downloads: 63)
What is the GPS?
Orbiting navigational satellites
Transmit position and time data
Handheld receivers calculate
latitude
longitude
altitude
velocity
Developed by
US Department of Defense
History of the GPS
1969-Defense Navigation Satellite System (DNSS) formed
1973-NAVSTAR Global Positioning System developed
1978-first 4 satellites launched Delta rocket launch
1993-24th satellite launched; initial
operational capability
1995-full operational capability
May 2000-Military accuracy
available to all users
User segment
User segment
GPS antennas & receiver/processors
Position
Velocity
Precise timing
Used by
Aircraft
Ground vehicles
Ships
Individuals
Why we need DGPS
DGPS is used to correct the various inaccuracies in the GPS system.
High performance GPS receiver at a known location.
DGPS can measure good to couple of meters in moving applications & better in stationary situations.
With it, GPS becomes a universal measurement system capable of positioning things on a very precise scale.
DGPS gives accuracy of 3-5 meters,while GPS gives accuracy of around 15-20 meters.
Global Positioning System2.ppt (Size: 619.5 KB / Downloads: 63)
What is the GPS?
Orbiting navigational satellites
Transmit position and time data
Handheld receivers calculate
latitude
longitude
altitude
velocity
Developed by
US Department of Defense
History of the GPS
1969-Defense Navigation Satellite System (DNSS) formed
1973-NAVSTAR Global Positioning System developed
1978-first 4 satellites launched Delta rocket launch
1993-24th satellite launched; initial
operational capability
1995-full operational capability
May 2000-Military accuracy
available to all users
User segment
User segment
GPS antennas & receiver/processors
Position
Velocity
Precise timing
Used by
Aircraft
Ground vehicles
Ships
Individuals
Why we need DGPS
DGPS is used to correct the various inaccuracies in the GPS system.
High performance GPS receiver at a known location.
DGPS can measure good to couple of meters in moving applications & better in stationary situations.
With it, GPS becomes a universal measurement system capable of positioning things on a very precise scale.
DGPS gives accuracy of 3-5 meters,while GPS gives accuracy of around 15-20 meters.