Frequently Asked Questions

SiteVision and GNSS Technology

What GNSS Satellite Technologies does Trimble SiteVision support?

The Trimble SiteVision system has the ability to track the following satellite constellations: GPS, GLONASS, BeiDou2, QZSS, and Galileo. To use these constellations the correction source needs to support these constellations.

What type of GNSS positions can Trimble SiteVision use?

The SiteVision Application displays the type of positioning solution being used under the GNSS menu. These are: Autonomous, RTK Float, RTK Fixed, Differential, RTX, HDRTK, SBAS, RTXCode.

The Trimble Catalyst service monitors the accuracy that your Trimble SiteVision Integrated Positioning System can achieve from the different signal types and automatically selects and outputs the solution type with best available accuracy.

What reference frame are my positions output in?

When using the Trimble Corrections Hub you must select the Target Reference Frame that matches the reference frame of your model. The SiteVision system will apply a datum transformation used by the Trimble Correction Services ITRF to the datum of your model.

What is the difference between Source Reference Frame and Target Reference Frame?

A network (for example Trimble VRS Now) will be broadcasting coordinates in relation to a global reference frame such as ITRF2014. This is called a Source Reference Frame.

You might be using Trimble SiteVision with Trimble VRS Now, but want your coordinates in relation to a local reference frame which is commonly used for that region, such as NZGD2000. This is called the Target Reference Frame.

I want to use SiteVision indoors, do I need to have GNSS?

No. To use Trimble SiteVision indoors you do not need to have GNSS or be connected to the Trimble Integrated Positioning System (IPS). Please note that the use of SiteVision indoors will not achieve the same accuracies as when used outdoors with high accuracy GNSS.

Do I need a separate subscription to Trimble VRS Now to use SiteVision?

No. Your Trimble SiteVision subscription includes bundled access to Trimble VRS Now correction streams where it is available, and worldwide access to Trimble RTX technology.

However, if you are operating outside of a Trimble VRS Now coverage area, you will need a separate local VRS or IBSS delivered correction to achieve optimum results, which may incur additional costs. If you are using Trimble SiteVision for Trimble Rugged hardware, you have the option to obtain corrections from a base station on site via the R12i or SPS986’s internal radio.

Can I use Trimble SiteVision with Local correction sources and Internet Base Stations?

Yes. Local correction sources such as a 3rd party or government Virtual Reference Station (VRS) Network or Internet Base Station (IBSS) can be used for the Trimble SiteVison Integrated Positioning System or Trimble SiteVision for Trimble Rugged hardware. You can also utilize the internal radio of the AR ready receiver and obtain corrections from a local base station via radio.

To use a local correction source for the Trimble Sitevision Integrated Positioning System, you will need to deselect Trimble Corrections Hub and enter the required information under GNSS Configuration within the Trimble SiteVision Application.