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Introductory Information About GPS

Introductory Information About GPS. Module: Measuring the Earth with GPS Unit 1: Collecting GPS Data By Karen M. Kortz and Jessica J. Smay. Version: 10 January, 2019. GPS Introduction. ?. Where Is GPS?. Have you used GPS? When?. Where Is GPS?.

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Introductory Information About GPS

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  1. Introductory Information About GPS Module: Measuring the Earth with GPS Unit 1: Collecting GPS Data By Karen M. Kortz and Jessica J. Smay Version: 10 January, 2019

  2. GPS Introduction

  3. ? Where Is GPS? • Have you used GPS? When?

  4. Where Is GPS? • GPS receivers are in phones, cars, etc.—basically anything that tells you where you are

  5. How Does GPS Work? • A receiver obtains signals from GPS satellites Artist’s conception of a GPS Block II-F satellite in Earth orbit

  6. How Does GPS Work? • Network of 24-32 satellites • Precisely known orbits and time • A receiver needs 4 satellites to accurately determine position http://spaceplace.nasa.gov/gps-pizza/en/

  7. How Does GPS Work? • Receiver position is determined by calculating the distances to at least 4 satellites • Solve for the variables: • N-S position • E-W position • Elevation • Time http://spaceplace.nasa.gov/gps-pizza/en/

  8. High Precision Permanent GPS station GPS antenna inside of dome Monument solidly attached into the ground with braces. If the ground moves, the station moves. Solar panel for power Equipment enclosure • GPS receiver • Power/batteries • Communications/ radio/ modem • Data storage/ memory

  9. ? High Precision Permanent GPS station What is the function of what the arrow is pointing to? • Power source • Receives satellite signal • Records data • Communication • Anchors station to ground

  10. ? High Precision Permanent GPS station What considerations need to be made when installing a GPS station?

  11. ? HOW CAN STUDYING GPS MOTION BE USEFUL TO SOCIETY? (Brainstorm) What GPS can measure: • Movement of ground… • …due to plate motion • …near earthquake faults • …during earthquakes • …due to movement of magma underground • …due to changing size of glaciers • …due to changing snow depth • …as it compacts (subsides) • …due to changing amount of groundwater within the ground • …due to changing size of lakes and reservoirs • ….from a landslide • Amount of water in the atmosphere • Amount of soil moisture • Vegetation growth • Sea level • Amount of ash in the atmosphere

  12. ? HOW CAN STUDYING GPS MOTION BE USEFUL TO SOCIETY? (Alternate) Which of these things that GPS measures has the largest impact on society? • Small motions of the ground that build up to lead to earthquakes • How much glaciers push the ground down, which changes as the size of glaciers change • The height of the ground, which is influenced by how much water is in or on it • How much the ground is sinking because of removal of oil or water

  13. GPS Jigsaw

  14. Measuring Earth with GPS Unit 1: Introduction to GPS Jigsaw • Part 1: Becoming an “expert” in your team • Team 1: Reference frames • Team 2: Direction of motion • Team 3: Speed of motion • Part 2: Applying your “expert” knowledge in new groups https://www.unavco.org/software/visualization/GPS-Velocity-Viewer/GPS-Velocity-Viewer.html

  15. GPS Think-Pair-Shares

  16. Think – Pair - Share ? List as many observations as you can from the data in these graphs from a GPS station near the Wasatch Front in Salt Lake City.

  17. Think – Pair - Share ? List as many observations as you can from the data in this graph from a GPS station near the tip of the Olympic Peninsula, west of Seattle. GPS station P403

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