Location service based on satellite link depends heavily on weather conditions and on the surroundings. Especially in dense urban environment, depots or tunnels, the satellite signal is obstructed and limits the performance of standard GNSS, therefore, a reliable position of the vehicle is not guaranteed.

As more and more services rely on uninterrupted position information, the need for an additional mechanisms to improve the reliability is given.

Three‑Dimensional Dead Reckoning completes the standard GPS/GNSS navigation by combining the satellite signal with additional information from gyroscope, accelerometer, vehicle speed and direction. This is especially important when quick navigation decisions must be made immediately upon exiting tunnels and parking garages

The NetModule products provides a GNSS Dead Reckoning solution based on the u-blox NEO-M8L chipset.

Gyroscope and accelerometer are integrated in the chipset – there is no need to add additional sensors, cabling, … to the installation. This operation mode is called Untethered Dead Reckoning (UDR) mode and is supported as standard feature.

Attention: Enabling a misconfigured GNSS with dead reckoning will lead to unusable GNSS performance, even under clear sky with satellite reception!

1. Install the device tight in the final position. Be aware of:
   • If the device is loose – the dead reckoning will not work properly.
   • If you change either the position or the orientation of the device, you must redo the following procedure.
2. Set the application area to mobile in the system menu

GNSS IMU Alignment

Roll: 0° Pitch: 0° Yaw: 0°


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