LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794
Production Information
Design-in
Page 22 of 85
2.1.3
Automotive Dead Reckoning (ADR) solutions
u-blox’ ADR supports different sensor inputs. The classical setup, called “Gyroscope plus Wheel Tick” (
GWT
),
consists of a gyroscope providing the heading information and wheel tick providing the speed information.
Alternatively, sensor information from left and right wheels (front or rear) or all wheels are used differentially to
deduce heading, called “Differential Wheel Tick” (
DWT
). This results in slightly lower performance compared to
GWT, but has the big advantage of saving the cost of a gyroscope.
2.1.3.1
Software sensor interface
Figure 10: Software sensor interface
The industry proven u-blox ADR solution is highly flexible. The application processor can support a vast array of
sensors, and must only convert the sensor data into UBX messages and pass them to the GPS receiver via a
standard serial interface (USB, SPI, UART, DDC). This makes the u-blox ADR solution very portable between
various vehicle platforms and reduces development effort and time-to-market. u-blox ADR is completely self-
calibrating, and requires only pre-configuration to the specific vehicle platform.
u-blox’ ADR with software sensor interface is available as NEO-6V module. These components are ideal for
factory installed navigation since they use sensor data (wheel tick and gyroscope data) taken directly from the
CAN bus.
2.1.3.2
Hardware sensor interface
Figure 11: Hardware sensor interface
The standard quality grade LEA-6R module is a dedicated ADR solution (GWT only) for aftermarket installations
with no access to the vehicle bus and no application processor for sensor data processing. Sensors are connected
directly to the module: gyroscopes via SPI and ADC and the speed pulse information from the tachometer.
