Public Road Testing

Maximum GNSS coverage with
quad-GNSS support

When testing on public roads, a large proportion of available satellites become obstructed by the physical infrastructure in the environment.

To protect the accuracy of the data, OxTS INS receive signals from four GNSS constellations (GPS, GLONASS, Galileo and BeiDou) which maximises the number of visible satellites at every point along the route.

Read the ‘quad-GNSS vs dual-GNSS’ report to understand the performance improvement gained by using more GNSS constellations during public-road data collection.

Reduced position drift with
ix/single-satellite aiding

To compute position, GNSS-only and loosely-coupled INS solutions need to track at least four satellites consistently. Any fewer and updates will either stop, or be computed solely by the IMU with increasing error, even if one, two or three satellites are still visible.

With an OxTS solution you are able to make use of every visible satellite – no matter how few are visible at that moment.

When fewer than four satellites are visible, OxTS’ single-satellite aiding technology blends the remaining signals with the output of a high-grade IMU to guard against degrading accuracy in challenging environments.

Fast RTK reacquisition after complete
GNSS outage with gxRTK Inertial Relock

When GNSS signals are temporarily interrupted by bridges and alike, RTK lock is lost and the process of reacquiring it must typically start from scratch. This can mean 10 – 20 seconds is spent outside of RTK after every interruption, no matter how brief.

With an OxTS solution, RTK relock time is reduced to around five seconds as the inertial measurements narrow down the possible solutions.

When you consider how many GNSS interruptions your vehicle encounters on every trip, it’s clear to see the difference this makes to the accuracy of the reference data.

Reduce position drift during GNSS outages with forwards/backwards post-processing

By processing your data twice, first in the same direction it was captured and then in reverse, errors accumulated during GNSS outages can be smoothed out to improve the accuracy of your data.

You can find out more about the real-time performance of OxTS solutions during prolonged GNSS outages here