global positioning systems gps units: development to modern uses
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Global Positioning Global Positioning SystemsSystemsGPS Units:
Development to Modern Uses
Getting to Know Your GPSGetting to Know Your GPSNotes Notes NotesNotes Notes Notes
Draw a Diagram in your notes
Label each of the buttons
Label each button with one function
-What do they do?
What is GPS?What is GPS?Notes Notes NotesNotes Notes Notes
Satellite based navigation system-satellites orbit Earth twice a day
U.S. Department of Defense in the early 1980’s
-first satellite launched in 1978
NAVSTAR-official governmental name for
GPS
How Does a GPS Work?How Does a GPS Work?•Satellites transmit data to Earth receivers
-You are holding a receiver!•Triangulation used to pin point location
-very similar to our method on the map!Notes Notes Notes
What really happens…1. Receiver compares time signal from when it was transmitted to when it was received
2. Time difference tells unit how far you are from the satellite
3. Distance relayed from several other satellites to receiverconfigures your position!
SatellitesSatellites• 24 orbiting 12000 miles above us
•Travel at speeds up to 7000 mph
•The more you use, the more accurate your data
• Powered by solar energy with backup battery -in case of solar eclipse!
•Stays on path using rocket boosters to adjust course
Would Your GPS Ever Let YOU Would Your GPS Ever Let YOU Down?Down?Clock errorsAtmosphereSolar FlaresRadiationAltitudeLarge buildingsNumber of
SatellitesAge of Unit
Military UsesMilitary UsesNavigation
Target tracking
Missile and projectile guidance
Search and Rescue
Reconnaissance and Map Creation
The GPS satellites also carry a set of nuclear detonation detectors
Scientific UsesScientific Uses Notes Notes NotesNotes Notes Notes
Surveying
-accurate data much fasterMapping
-accurate elevation, lat. & long. quicklyEmergency Management
-receiver in phones so can be located by dispatcher
Monitoring Tectonics
-measure actual distance moved during an earthquake
Uniform time
-transmits data via time measurements, very precise
Prices…Can Everyone Get Prices…Can Everyone Get One?One?Civilian
ranges from $100 to $500
Survey ranges from $1000 to $5000
MilitaryWho knows!
* You could spend as much as you wanted!
Review…What Have You Review…What Have You Learned?Learned?