When you update your VBOX 3i to the latest firmware, or purchase a new VBOX 3i, you will be able to utilise wheel speed data from the vehicle’s CAN bus to enhance the accuracy of your data in areas with poor GNSS.
Combining wheel speed data with GNSS and inertial measurements makes a huge improvement to the accuracy of the estimated speed and position in tunnels, urban canyons and indoor car parks, or anywhere else with limited or no satellite coverage.
As you can see in the image above, our vehicle was tracked with great accuracy using a VBOX in a difficult, GPS obscured area in London. We achieved this impressive level of accuracy using a combination of GNSS, inertial and CAN wheel speed data, which meant our position and velocity measurements were maintained at all times, even when we drove through two long tunnels.