using gps with real time correction
Post on 24-Feb-2016
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Using GPS with Real Time Correction
Presenter Warren EadeField Services Manager
System Requirements
• GPS system capable of receiving external corrections– Built-in– External
• An external correction source – Satellite– Radio– cellular
Correction Sources
• Virtual Reference Station (VRS)• OmniSTAR• SBAS & WaaS• Single Base • Marine Beacon
Pacific Region
• OmniSTAR– Land service– Marine Service
• Marine Beacon– Marine Service that can work for Land
OmniStar
• A subscription satellite broadcast Service• 3 Service levels (VBS, XP 20-30cm, HP 10cm)
• (Not all available in some areas)
• 2 Wet Services• Subscription available for– Day– Week– Month– Year
Coverage
Requirements of the GPS
• GPS needs to have OmniSTAR Receiver built in– Eg Trimble ProXRT, Ag332, SPS-750, SPS-850• Also supported in some Ashtech & Topcon
• External receivers from OmniStar
How it works1. GPS satellites 2. Multiple OmniSTAR GPS Reference Sites 3. Send GPS corrections via lease line to 4. Houston Network Control Center where data corrections are checked and repackaged for
uplink to 5. L- Band Geostationary Satellite 6. Typical Geostationary L-Band satellite footprint. 7. Correction data are received and applied real-time
Setup Inside TerraSync
Limitation
• GPS Needs OmniSTAR receiver• Subscription service• Due to the course vector base map used by
OmniSTAR, Marine wet service is needed in the Island.
• May need up to 15 deg horizon plane to see broadcast Satelite
Who Might Use This?
• Water and waste water services• Teleco’s• Electricity authorities• Irrigation projects• Stake outs• Emergency relief projects• Prelim site survey’s• Agriculture
Questions?
References• www.omnistar.com.au• www.trimble.com
warren.eade@geosystems.co.nz
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