Introduction to Global Navigation Satellite Systems IAEA International Atomic Energy Agency
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 IAEA Iain Darby IAEA:NAPC-PH/NSIL 2
Geospatial Data Collection Systems Geographic Information GPS / System GLONASS Exported (GIS) Unit Data Data Radiation Logging Meter Device or Computer Map IAEA Iain Darby IAEA:NAPC-PH/NSIL 3
Geospatial Data Collection Systems 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 IAEA Iain Darby IAEA:NAPC-PH/NSIL 4
GEM ground-based survey with ArcGIS to produce map product. Used to assess variability in urban background. IAEA 118
Urban background can vary considerably due to historic materials such as granite pavers that may still reside in the shallow subsurface. IAEA uk_npss bristol 2013 Iain Darby IAEA:NAPC-PH/NSIL 119
GEM ground-based survey example with ArcGIS ~15 km About 10 hours of driving IAEA Iain Darby IAEA:NAPC-PH/NSIL
GEM ground-based survey example with ArcGIS IAEA Discussion and/or presentation of products is for Iain Darby IAEA:NAPC-PH/NSIL informational purposes only and not an endorsement.
GEM ground-based survey example with ArcGIS IAEA Discussion and/or presentation of products is for Iain Darby IAEA:NAPC-PH/NSIL informational purposes only and not an endorsement.
Survey Grade GPS with Robotic Laser Total Station with FAST • 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 IAEA Iain Darby IAEA:NAPC-PH/NSIL 10 Discussion and/or presentation of products is for informational purposes only and not an endorsement.
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 IAEA Iain Darby IAEA:NAPC-PH/NSIL 11 Discussion and/or presentation of products is for informational purposes only and not an endorsement.
IAEA Iain Darby IAEA:NAPC-PH/NSIL 12
Common GPS vs. Correction with Robotic Laser Total Station Metal high-rise buildings Location corrected with Total IAEA reduced GPS accuracy Station based on GPS time Iain Darby IAEA:NAPC-PH/NSIL 13
Recommend
More recommend
