IAEA International Atomic Energy Agency

Introduction to Global Navigation Satellite Systems

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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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GPS / GLONASS

UnitData

Logging Device or Computer

Radiation Meter

Geographic Information

System (GIS)

Map

Exported

Data

Geospatial Data Collection Systems

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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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GEM ground-based survey with ArcGIS to produce map product. Used to assess variability in urban background.

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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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~15 km

About 10 hours of driving

GEM ground-based survey example with ArcGIS

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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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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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• 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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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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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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