Product specifications

Crescent Integrator’s Manual 34
To query the Crescent Vector for the current status of this feature, issue the
following command.
$JATT,TILTAID<CR><LF>
Note: If you choose to increase the antenna separation of your Crescent Vector
OEM beyond the default 0.5 m length, use of tilt aiding is required.
$JATT,TILTCAL
The tilt sensor of the Crescent Vector can be calibrated in the field; however the
Crescent Vector enclosure must be horizontal when performing the calibration. To
calibrate the Crescent Vector’s internal tilt sensor, issue the following command.
$JATT,TILTCAL<CR><LF>
The calibration process takes about two seconds to complete. The calibration is
automatically saved to memory for subsequent power cycles.
$JATT,GYROAID
The Crescent Vector’s internal gyro is shipped off by default, and it offers two
benefits. It will shorten reacquisition times when a GPS heading is lost, due to
obstruction of satellite signals, by reducing the search volume required for solution of
the RTK. It will also provide an accurate substitute heading for a short period
(depending on the roll and pitch of the vessel) ideally seeing the system through to
reacquisition. This is why we highly recommend you turn the gyro aiding on.
Exceeding rates of 90 degrees per second is not recommended since the gyro cannot
measure rates beyond this point. This is a new recommendation since we now use
gyro measurements to get a heading rate measurement.
To turn on the gyro-aiding feature, use the following command.
$JATT,GYROAID,YES<CR><LF>
If you wish to turn this feature off, use the following command.
$JATT,GYROAID,NO<CR><LF>
If you wish to request the status of this message, send the following command.
$JATT,GYROAID<CR><LF>
Every time the Crescent Vector is powered, the gyro goes through a ‘warm-up’
procedure. This warm up calibrates the gyro to a point where it is operational to its
fullest potential. The gyro will automatically warm up by itself over the span of
several minutes. This ‘self-calibration’ is the equivalent to performing the procedure