ProNav Norway – a
Company
page 41
Rev.2
10.02.2020
Supplemental Sensors
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Continued
Gyro aiding
The V200n’s internal sensor reduces reacquisition times when a GNSS
heading is lost due to blocked satellite signals.
The sensor provides a relative change in angle since the last computed
heading and defines the search space as a wedge-shaped location (see
Figure 4-2).
Figure 4-2: V200n gyro aiding
The gyro aiding accurately smooths the heading output and the ROT. The
sensor also provides an alternate source of heading, accurate to within 1º
per minute for up to three minutes in times of GNSS loss for either
antenna. If the outage lasts longer than three minutes, the sensor will
have drifted too far and the V200n begins outputting null fields in the
heading output messages. There is no user control over the timeout
period of the sensor.
The sensor initializes itself at power up and during initialization, or you
can calibrate it as outlined in the
Hemisphere GNSS Technical Reference
For optimal performance, when the sensor is first initializing, the
dynamics the sensor experiences during this warm-up period are similar
to the regular operating dynamics.
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