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untethered dead reckoning (UDR)

Automotive Dead Reckoning (ADR) and Untethered Dead Reckoning (UDR) are methods for improving the positional accuracy of navigation signals.

Both methods are intended to improve position determination in urban areas, since this deteriorates when driving through urban canyons or tunnels due to limited signal reception.

While in the ADR method the GNSS positions of the global navigation systems are aligned with the current position, the UDR technique works with a UDR module that determines the vehicle acceleration and the deviations from the straight line and calculates the current position from this, together with the GPS data. The inertial measurement unit (IMU) of the UDR module records the acceleration forces and rotational movements and calculates the driving and location coordinates from this.

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Englisch: untethered dead reckoning - UDR
Updated at: 18.04.2020
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