global positioning system: an overview. parts of gps system -satellites -ground stations -user gps...
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Global Positioning System:Global Positioning System:An OverviewAn Overview
Parts of GPS system
-Satellites-Ground Stations-User GPS receivers
Purposes of GPS systems
-Locating
-Navigation
-Tracking
-Mapping
-Timing
Timing
-All 24 satellites in constellation have atomic clocks. (There are 30 in the constellation as of 2010)-Ground stations synchronize all of the clocks for
extremely accurate timing.
-Satellites also target themselves (Doppler Effect)
How do Global Positioning Systems Work?
- 24 active satellites in MEO (Medium Earth Orbit)
- 11, 000 miles in orbit- All satellites inclined 55 degrees from equator
Triangulation
Satellites use triangulation to locate point and time
- All locations need four satellites to effectively triangulate position
GPS Constellation
Triangulation
BESTbetter
good
Geometric Dilution of Precision and other Reasons for GPS system failure
How do I use the GPS Receiver?
Military Uses
Originally Developed by the US Department of Defense (current GPS system)
Clear military purposes Navigating missiles and combat airplanes Strategic positioning and location of troops
Locating vehicles (ships, tanks, ATV’s)
Commercial (Civilian) Uses
Guiding our cars, trains, trucks, boats, ships, and airplanes
Police use Hikers *Organizations and Companies
FarmersMany more
Scientific Uses for GPS
Geoscience--Seismology-Volcanology-Meteorology-Geodesy
Scientific Uses for GPS (cont’d)
SurveyorsZoologistsEngineers
NASAAstronomers
Future Uses
Backpacks are currently being developed to guide the blind through intricacies of major cities
Virtually unlimited possibilities GIS systems-tracking data
Future Uses
Geocaching
- An adventure for hikers using GPS systems- Started on May 3, 2000 by Dave Ulmer- Posted the event on a GPS
internet users group
Geocaching
- Beaver Creek, Oregon- N 45 17.460 W 122 24.800- Basic idea: hide a container in the woods and
note coordinates using only GPS unit
“Take some stuff, leave some stuff”
Originally called, “The Great American Stash Hunt”
Mike Teague was the first to find “stash” left by Ulmer
Geocaching
Slashdot- on-line magazine for techies reported the event on Sept. 25, 2000
New York Times that OctoberTaken off and now is global phenomena
Geocaching.com
Benefits of GPS in the Classroom
Geography lessons-map the school/areaMathematicsSocial Studies-how areas have changed over
timeCommunity Service
Benefits of GPS in the Classroom
What are some benefits you see for the classroom?
Get into groups and discuss options.Be thinking of ideas during next lesson.
You will deliver your ideas to the class when we return
LET’S GO!!!!