GNSS Correction Sources

Flexibility for Your Business

Your GNSS operations are only as good as your correction source, it’s important to choose the right one for your business. GNSS correction sources are available on-site in a variety of ways, depending on what you need for your jobsite. Choose to run a local base station on site, obtain corrections from a local VRS Now network service or even obtain corrections from the satellite delivered CenterPoint RTX correction service.

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Flexible GNSS Corrections

Reliable Correction Sources for Accurate, Scalable Positioning

If you are running a large operation with many machines, you will need a local GNSS base station (or a few) and if you are site surveying or doing reconnaissance you may opt for a high accuracy satellite delivered service such as CenterPoint RTX.

CenterPoint RTX

CenterPoint RTX is the premier mobile satellite services (MSS) technology delivering VRS-level performance for land-based construction sites worldwide, 24 hours a day, 365 days a year. MSS is delivered via geo-stationary L-band satellites. The signal is received at the GNSS rover by the Trimble GNSS Antenna or GNSS Smart Antenna, so there is no need for a UHF radio or cellular network connection.

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Trimble xFill

Trimble xFill runs seamlessly in the background, automatically bridging the gap if a user’s Real-Time Kinematic (RTK) or VRS correction source is interrupted due to cellular signal disruption or loss of UHF radio connectivity.

Trimble xFill is a satellite-delivered service that will maintain RTK precision for five minutes after the loss of an RTK correction stream.

Internet Base Station Service (IBSS)

Trimble Internet Base Station Service (IBSS) broadcasts Real-Time Kinematic (RTK) data or Differential (DGNSS) corrections from your base station over the internet via Wi-Fi or a cellular network. This makes it easier and more economical to use high precision GNSS for site positioning or machine control on the construction site over ranges which exceed the limitation of the UHF radio link. IBSS can also be used to augment UHF in areas of poor UHF coverage.

Satellite-Based Augmentation System (SBAS)

The Satellite-Based Augmentation System (SBAS) is based on GNSS measurements from accurately-located reference stations deployed across an entire continent. The differential corrections and integrity messages are broadcast over a continent using geostationary satellites as an augmentation or overlay of the original GNSS message. Systems in place delivering corrections at no cost for sub-meter positioning are:

  • WAAS (USA)

  • EGNOS (Europe)

  • GAGAN (India)

  • MSAS (Japan)

Compare Correction Options

Choose the Right GNSS Correction Source for Your Workflow

Use the technical specifications below to decide on the source that makes sense for your workflow and performance and precision requirements.

GNSS Correction Source SPS GNSS Precision Delivery Delivery
Trimble GNSS RTK Base H 0.8 cm (0.026”) + 1 ppm
V 1.5 cm (0.05”) + 1 ppm		 UHF, WiFi, IBSS < 8 seconds
VRS Now H 0.8 cm (0.026”) + 0.5 ppm
V 1.5 cm (0.05”) + 0.5 ppm		 Internet < 8 seconds
CenterPoint RTX H < 2 cm (0.066”)
V < 5 cm (0.16”)		 Satellite, Internet < 1 minute (Fast)
< 15 minutes (Standard)
MSK Beacon / DGNSS H 30 cm (1’) + 1 ppm
V 50 cm (1.6’) + 1 ppm		 300 kHz Beacon N/A
DGNSS H 30 cm (1’) + 1 ppm
V 50 cm (1.6’) + 1 ppm		 UHF, WiFi, IBSS N/A
SBAS H < 50 cm (1.6’)
V < 85 cm (2.8’)		 Satellite N/A
Related Media

See the GNSS Correction Sources in Action

Watch the video to see how GNSS correction sources work in real-world applications and how they improve positioning accuracy, efficiency, and overall site performance.

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