Wheel Tick And Direction - u-blox XPLR-HPG-1 User Manual

XPLR-HPG-1 - User guide

2.1.12 Wheel tick and Direction

For automotive applications, Wheel Tick (WT) and Direction (DR) data generated from software or
directly from a vehicle sensor can be used to improve Automotive Dead Reckoning (ADR) calculations
during instances of weak or no GNSS coverage. WT/DIR data can be communicated from the signal
conditioning circuit to the ZED-F9R module through NORA-W1 or directly using an external cable.
Two operational WT/DIR subsystem scenarios showing the interfaces and data flow between the
connectors, signal conditioning circuit, NORA-W106 multiradio module, and ZED-F9R GNSS module
are shown in Figure 17 and Figure 18. The active components in each scenario are highlighted.
In the first (and most recommended) use scenario shown in Figure 17, an external cable is connected
between the two 3-pin headers, J2 (WT/DIR input) and J5 (WT/DIR output). WT/DIR data is
communicated to the ZED-F9R module on the GNSS RTK 2 Click board [6] through the cable.
The WT_IN and DIR_IN input signals connect to the signal conditioning circuit through J2. The signal
conditioning circuit provides the electrical isolation and switching step-down between the (3.3 V –
24 V) input signals and he standard 3.3 V logic output voltage levels.
Figure 17: Wheel tick/ Direction flow External cable scenario
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