Introduction to Global Navigation Satellite Systems IAEA - - PowerPoint PPT Presentation

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International Atomic Energy Agency

Introduction to Global Navigation Satellite Systems

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 Unit

Data Logging Device or Computer

Radiation Meter

Geographic Information System (GIS)

Map

Exported Data

Geospatial Data Collection Systems

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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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118

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

IAEA

Iain 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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Iain Darby IAEA:NAPC-PH/NSIL

~15 km About 10 hours of driving GEM ground-based survey example with ArcGIS

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Iain 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.

IAEA

Iain 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.

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. 10

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. 11

IAEA

Iain Darby IAEA:NAPC-PH/NSIL 12

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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