u-blox XPLR-HPG-1, Руководство пользователя

Страница: 25 / 37

XPLR-HPG-1 - User guide
UBX-23000692 - R01 Hardware description Page 25 of 37
C1-Public
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