Introduction to Global Navigation Satellite Systems -...
Transcript of Introduction to Global Navigation Satellite Systems -...
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IAEA International Atomic Energy Agency
Introduction to Global Navigation Satellite Systems
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
Global Navigation Satellite Systems
• Global Navigation Satellite Systems: • Global Positioning System (GPS) • Globalnaya Navigatsionnaya Sputnikovaya
Sistema (GLONASS) • Constellation of satellites transmit
messages that include: • Time the message was transmitted • Satellite position at time of message
transmission • GPS receivers use the signals to
determine their current location, the time, and their velocity
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
GPS / GLONASS
UnitData
Logging Device or Computer
Radiation Meter
Geographic Information
System (GIS)
Map
Exported
Data
Geospatial Data Collection Systems
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
Systems may be developed from separate components: • GNSS receiver / antenna • Radiation meter with digital output • Mobile computer • Data collection software / firmware
Systems are now available that integrate many or all of these components into one device
Geospatial Data Collection Systems
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IAEA118
GEM ground-based survey with ArcGIS to produce map product. Used to assess variability in urban background.
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IAEAIain Darby IAEA:NAPC-PH/NSIL 119
Urban background can vary considerably due to historic materials such as granite pavers that may still reside in the shallow subsurface.
uk_npss bristol 2013
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IAEAIain Darby IAEA:NAPC-PH/NSIL
~15 km
About 10 hours of driving
GEM ground-based survey example with ArcGIS
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IAEAIain Darby IAEA:NAPC-PH/NSIL
GEM ground-based survey example with ArcGIS
Discussion and/or presentation of products is for informational purposes only and not an endorsement.
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IAEAIain Darby IAEA:NAPC-PH/NSIL
GEM ground-based survey example with ArcGIS
Discussion and/or presentation of products is for informational purposes only and not an endorsement.
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
• Leica Total Station with integrated GNSS receiver • Infared laser distance with 360 degree prism
• 7,000 ft. distance single point • 1,000 ft. continuous point • Continuous accuracy: 3 mm + 1.5 ppm (typically <0.15 s)
• Set-up on a surveyed position (x,y,z) • TS fully robotic, auto targeting, and self tracking
• Single point or continuous data collection • Integrated with FIELDS FAST software
• Psuedo NMEA • X,Y,Z • Serial or bluetooth from data logger to FAST computer
• Date & time from computer • Integrate sampling equipment through FAST
• 900 Mhz radio modems
Survey Grade GPS with Robotic Laser Total Station with FAST
Discussion and/or presentation of products is for informational purposes only and not an endorsement.
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
Survey Grade GPS with Robotic Laser Total Station
• Survey Grade GPS cm. accuracy x,y,z
• Total Station can be used in heavy canopy, indoors, urban areas
• 360 degree target prism can be moving with continuous data collection
Discussion and/or presentation of products is for informational purposes only and not an endorsement.
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IAEA Iain Darby IAEA:NAPC-PH/NSIL 12
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IAEA Iain Darby IAEA:NAPC-PH/NSIL
Common GPS vs. Correction with Robotic Laser Total Station
Metal high-rise buildings reduced GPS accuracy
Location corrected with Total Station based on GPS time
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