Learning with gps
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Learning with GPS. Presenter- Dan Carey [email protected] https://careywiki.wikispaces.com / August 11 and 12, 2009. Today’s Goals. Learn what is GPS How to work with a GPS unit Initialize it, collect data, enter data, clear data How it is used in the real world

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Learning with GPS

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Learning with gps

Learning with GPS

Presenter- Dan Carey

[email protected]

https://careywiki.wikispaces.com/

August 11 and 12, 2009


Today s goals

Today’s Goals

  • Learn what is GPS

  • How to work with a GPS unit

  • Initialize it, collect data, enter data, clear data

  • How it is used in the real world

  • Why it is important in education

  • Hands on practice


History of gps

History of GPS

Global

Positioning

System

Began in the 1970’s for military purposes

Fully operational April 1995.


How a gps works

How a GPS works

  • Three components to Global Positioning Systems

    • Space segment

    • User segment – you holding the GPS unit

    • Control segment


Space segment

Space Segment

  • Consists 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 NASA

    Source: http://www.navcen.uscg.gov/ftp/gps/ggeninfo/gps-iif.tif


User segment

User Segment

  • Consists of a GPS receiver

    • Can be a handheld unit

    • In your automobile

    • Farm equipment

    • Cell phone

    • A GPS receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth


Control segment

Control Segment

  • The 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.


Putting it all together

Putting it all together

Space Segment

User Segment

Control Segment

GroundAntennas

Monitor Stations

Master Station


How a gps can be used

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 interference

Sources of Signal Interference

Earth’s Atmosphere

Solid Structures

Metal

Electro-magnetic Fields


Waypoint

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 route

Planning a Navigation Route

= Waypoint

Start


How a receiver sees your route

How A Receiver Sees Your Route


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