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Improved drift performance with vertical advanced slip technology

Software Releases March 12, 2015


OxTS customers working in adverse GNSS conditions such as inner cities or tree covered areas can now benefit from improved drift performance with our new vertical advanced slip technology.

An extension of our existing advanced slip technology, vertical advanced slip creates a coupling in the Kalman filter between the vehicle pitch angle and vertical velocity. This means that in situations where the GNSS signal is blocked or lost, the vehicle velocity is computed from the IMU measurements and constrained to the direction of travel. When used in conjunction with a DMI or wheelspeed odometer, the position drift is greatly reduced and maximum accuracy is maintained.

When GPS signals are unavailable, there is no aiding update to constrain vertical navigation errors in position and velocity. The new vertical advanced slip feature stabilises the vertical motion and allows the navigation outputs to remain usable through GPS outages of up to 5 minutes (when combined with horizontal advanced slip and wheel-speed updates).

This is particularly important to users carrying out precision work in harsh GNSS environments, such as mobile mapping in urban environments with the Survey+ or conducting open road ADAS tests with the RT-Range S.

For existing customers already familiar with our configuration software NAVconfig, here is how to enable vertical advanced slip. Vertical advanced slip can be enabled on the “Advanced Slip” page in NAVconfig (if you are working with one of our RT products) or on the “Wheel Configuration” page in NAVconfig (if you have a Survey+, Inertial+ or xNAV product from OxTS).










This new feature is available with the latest software release, which can be obtained if you’re on a support contract.

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