Racelogic are upgrading the GPS receiver in the VBOX Sport to be multi-constellation. The new receiver operates at 10 Hz and will be able to use GPS & GLONASS for positioning. No pricing or part numbers will be affected.
The external antenna suitable for use with VBOX Sport is now the RLACS215 GPS/GLONASS antenna.
VBOX Sport 10 Hz gains an added benefit by using a dual constellation solution for signal processing (GPS and GLONASS). By using both constellations together we are able to calculate a much more accurate speed and position signal in challenging GNSS reception areas. Challenging areas include tree lined roads, tall buildings and large structures that can block and reflect GNSS signals.
Here is a scenario driving through town in a challenging GNSS signal reception area due to tall building close to the road. During the test we compared the new 10 Hz VBOX Sport against the older 20 Hz VBOX Sport. As you can see the speed and position signals on the blue trace (20 Hz GPS only VBOX) are heavily affected by multipath reflection.
Speed (Red = 10 Hz GPS/GLONASS, Blue = 20 Hz GPS Only), as the vehicle moves into a poor GNSS signal reception area speed signal degrades for the GPS only VBOX (blue).
Satellite lock during the recording (Red = 10 Hz GPS/GLONASS, Blue = 20 Hz GPS Only), note that 12 GNSS satellites are maintained on the 10 Hz VBOX. The VBOX 10 Hz can see and track more than 12 satellites, it chooses the best 12 satellites to use to produce the best speed and position signal possible.
Even though the sample frequency has dropped from 20 Hz to 10 Hz the quality of the speed and position signals has significantly improved. Also note the drop in sample frequency does not impact acceleration, deceleration and lap timing results, this is due to interpolation within software. For most, if not all, motorsport and automotive applications the difference between 10 Hz and 20 Hz is negligible.
In poor GNSS reception areas we would actually expect to see an improvement on lap timing results due to better signal quality.