Learning with GPSPresenter- Dan [email protected]
https://careywiki.wikispaces.com/August 11 and 12, 2009
Today’s GoalsLearn what is GPSHow to work with a GPS unitInitialize it, collect data, enter data, clear
data How it is used in the real world Why it is important in educationHands on practice
History of GPSGlobal
Positioning
System
Began in the 1970’s for military purposesFully operational April 1995.
How a GPS worksThree components to Global Positioning
SystemsSpace segmentUser segment – you holding the GPS unitControl segment
Space SegmentConsists of 24 to 32 satellites that orbit
earth that are sending precise radio signals to the GPS receiver
Artist Interpretation of GPS satellite, image courtesy of NASASource: http://www.navcen.uscg.gov/ftp/gps/ggeninfo/gps-iif.tif
User SegmentConsists of a GPS receiver
Can be a handheld unitIn your automobileFarm equipmentCell phone
A GPS receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth
Control SegmentThe flight paths of the satellites are tracked
by US Air Force monitoring stations The tracking information is sent to the Air
Force Space Command's master control station in Colorado Springs. Then contacts each GPS satellite regularly with a navigational update.
Control Segment
Space Segment
User Segment
Putting it all togetherPutting it all together
Monitor Stations
GroundAntennas
Master Station
How a GPS can be used Military. Search and rescue. Disaster relief. Surveying. Marine, aeronautical and terrestrial navigation. Remote controlled vehicle and robot guidance. Satellite positioning and tracking. Shipping. Geographic Information Systems (GIS). Recreation.
Sources of Signal InterferenceSources of Signal Interference
Earth’s Atmosphere
Solid Structures
Metal
Electro-magnetic Fields
Waypoint A waypoint is based on coordinates entered
into a GPS receiver’s memory. It can be either a saved position fix, or user
entered coordinates. It can be created for any remote point on
earth. It must have a receiver designated code or
number, or a user supplied name. Once entered and saved, a waypoint remains
unchanged in the receiver’s memory until edited or deleted.
Planning a Navigation RoutePlanning a Navigation Route
Start
= Waypoint
How A Receiver Sees Your RouteHow A Receiver Sees Your Route
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