10.6.1.16 Reverse Alignment, Forward High
Type:
Digital Input
GPIO Port:
1, 2
Auxiliary:
Receive
Description
:
This function is designed to reverse the alignment settings for vehicles that can have two
vehicle forward directions, such as locomotives.
10.6.1.17 Zero Angular Velocity Input
Type:
Digital Input
GPIO Port:
1, 2
Auxiliary:
Receive
Description
:
In this function, a high state indicates to Boreas that the vehicle is not rotating. The low
state indicates that the vehicle could be rotating. Use of this function can significantly
improve heading drift performance when a GNSS signal is not available.
10.6.1.18 Odometer Input
Type:
Frequency Input
GPIO Port:
1, 2
Auxiliary:
Receive
Description
:
This function is designed for low-resolution vehicle speed sensors and odometers. It
expects a normally low input with a high state for the trigger. If the pulse length is more
than 0.1 metres then this odometer input function should be used. If it is less than 0.1
metres, the wheel speed sensor function should be used. Contact Advanced Navigation
support for help integrating with your speed sensor.
Parameter Value
Trigger Low → High
Maximum Frequency 600Khz
Maximum Pulse Rate 4294967 pulses/metre
Table 34: Odometer Specifications
10.6.1.19 Pitot Tube Input
Type:
Frequency Input
GPIO Port:
1, 2
Auxiliary:
Receive
Description
:
This function allows fixed wing aircraft to measure airspeed to improve navigation
performance. It requires a differential pressure sensor that has a frequency output such
as the Kavlico P992 (frequency output option) or the Paroscientific series 5300. Contact
Advanced Navigation support@advancednavigation.com for help integrating with a pitot
tube.
v1.2 Page 101 11 Oct 2022
Boreas Reference Manual • Interfacing
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