GPS: Global Positioning System
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Transcript of GPS: Global Positioning System
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GPS:Global
Positioning System
Wildlife Management 20/30
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Feasibility studies begun in 1960’s. Pentagon appropriates funding in 1973. First satellite launched in 1978. System declared fully operational in April, 1995.
The History of GPS
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How do you use these satellites to calculate your position?
The Global Positioning System is a constellation of 31 satellites that is used to calculate your position.
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Control Segment
Space Segment
User Segment
Three Segments of the GPS
Monitor Stations
GroundAntennas
Master Station
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Kwajalein Atoll
US Space Command
Control Segment
Hawaii
Ascension Is.
Diego Garcia
Cape Canaveral
Ground AntennaMaster Control StationMonitor Station
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Control Segment
Space Segment
User Segment
Three Segments of the GPS
Monitor Stations
GroundAntennas
Master Station
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Space Segment
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Control Segment
Space Segment
User Segment
Three Segments of the GPS
Monitor Stations
GroundAntennas
Master Station
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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.
User Segment
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Position is Based on Time
T + 3Distance between satellite and receiver = “3 times the speed of light”
T
Signal leaves satellite at time “T”
Signal is picked up by the receiver at time “T + 3”
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Sources of Signal Interference
Earth’s Atmosphere
Solid Structures
Metal
Electro-magnetic Fields
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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.
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Getting Started…• 5 buttons:
o Powero Page (also the “back” function)o Entero Upo Down
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Getting Started…• Power the GPS on: Hold the Power Button
• It will prompt you if you are indoors, select: YES by pressing the up/down and enter keys.
• Keep selecting the “Page” button until you get to the MENU screen. You know you’re there when the following options are shown:o Marko Waypointso Routeso Trackso Setup
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Getting Started…• Scroll down to Mark, and select it with the Enter
key.
• It will prompt you to Mark Waypoint, before you select YES with the Enter key, use the UP arrow to the Number: 001 Change this to the title school. Once that is titled, scroll down to highlight the OK and select it with your Enter key.
• Write down the Elevation:• Write down your bearing:
o N__*__.___`o W___*__.___`
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Marking Way Points• You and a partner are going to mark Way Points. • Head to the M and mark the Way Point as M. • Head to the closet field goal post on the football
field and mark the Way Point as Post.• Head to the water tower and mark the Way Point
as Blue.
• **It is critical that you label your Way Points!!!**