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Real Time Corrections
for GNSS Receivers
Karyn Nolan and Erik Anderson
Which tool do you use?
Different Applications Require Different Tools
Accuracy varies with receivers -- read the specs!
Survey (cm)
Mapping (10cm-5m)
Accuracy
Autonomous GNSS 10-15m horizontal
Differential GNSS - MGIS 0.1 - 5m horizontal (depending on
equipment & correction source)
“Fixed” Baseline GNSS - Survey 1-3 cm
Optical Total Station <1 cm
Real Time Correction Sources Autonomous
– 10 m with uncorrected GPS
Satellite Based Augmentation System (SBAS) – 2-4 m in Hawaii– WAAS - US– EGNOS - Europe– MSAS – Japan– GAGAN - India
Satellite Based Augmentation System
< 1 - 5 m< 1 - 5 m
Trimble Positioning Services
Internet and Satellite Based Real Time Correction Sources
How It Works
Powered by the Global Network of Reference Stations
Real Time Extended (RTX) Satellite or Internet broadcast
Hawaii is Internet Only
Annual or seasonal subscriptions
Post processing (free) service available
CenterPoint RTX
(< 4 cm)
RangePoint RTX
(< 50 cm)
ViewPoint RTX
(< 1 m)Trimble
xFill
CenterPoint RTX Post-
Processing
RTX Satellite Broadcast
Omnistar Satellite Differential Subscription Broadcast
OmniSTAR HP
OmniSTAR XP/G2
OmniSTAR VBS
Trimble Positioning Services
Trimble Positioning Services
Real Time Correction Sources Autonomous – no correction source Satellite Based Augmentation System (SBAS)
– WAAS - US– EGNOS - Europe– MSAS – Japan– GAGAN – India
Omnistar (Satellite Differential Subscription Broadcast)
RTX (only available over Internet in Hawaii) CenterPoint RTX Post-Processing also available for survey receivers
Single Base Broadcast– Radio or Internet– Currently Testing on Oahu – UH and SITECH – Maui soon!– Monthly Subscriptions
Single Base Corrections
Single Base Corrections
Trimble Positioning Services
Real Time Correction Sources Autonomous – no correction source
Satellite Based Augmentation System (SBAS)– WAAS - US– EGNOS - Europe– MSAS – Japan– GAGAN – India
Omnistar (Satellite Differential Subscription Broadcast)
RTX (only available over Internet in Hawaii) CenterPoint RTX Post-Processing also available for survey receivers
Single Base Broadcast– Radio or Internet
Real Time Network (Trimble Virtual Reference System)
Real Time Network (RTN)
A network of base stations streams reference information to a central server via internet
Difference in Accuracy between traditional RTK and RTN
Hawaii Real Time Network
Resources
Trimble Resources
Documentation and Downloads• www.Trimble.com/support Trimble Knowledge Network (TKN)• Solution Center• Learning Center
Trimble.com• www.Trimble.com/MappingGIS• www.Trimble.com/Survey• www.Trimble.com/timetodomore
Trimble Resourceswww.trimble.com/timetodomore
