Programming Manual 78
8.15 $JATT,PBIAS
You may adjust the pitch / roll output from the Vector in order to calibrate
the measurement if the Antenna Array is not installed in a horizontal plane.
The following NMEA message allows to you to calibrate the pitch / roll
reading from the Vector.
$JATT,PBIAS,x<CR><LF>
Where x is a bias that will be added to the Vector’s pitch / roll measure, in
degrees. The acceptable range for the heading bias is -15.0° to 15.0°. The
default value of this feature is 0.0°.
To determine what the current pitch compensation angle is, send the
following message to the Vector.
$JATT,PBIAS<CR><LF>
Note - The pitch / roll bias is added after the negation of the pitch /
roll measurement (if so invoked with the $JATT,NEGTILT
command).
8.16 $JATT,NEGTILT
When the secondary GPS antenna is below the primary GPS antenna, the
angle from the horizon at the primary GPS antenna to the secondary GPS
antenna is considered negative.
Depending on your convention for positive and negative pitch / roll, you may
wish to change the sign (either positive or negative) of the pitch / roll. To
do this, issue the following command.
$JATT,NEGTILT,YES<CR><LF>
To return the sign of the pitch / roll measurement to its original value, issue
the following command.
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