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Chapter 3: Operation
V104n Overview
The V104n provides accurate and reliable heading and position information
at high update rates. To accomplish this task, the V104n uses a high
performance GPS receiver and two antennas for GPS signal processing. One
antenna is designated as the primary GPS antenna and the other is the
secondary GPS antenna. Positions computed by the V104n are referenced to
the phase center of the primary GPS antenna. Heading data references the
vector formed from the primary GPS antenna phase center to the secondary
GPS antenna phase center.
The heading arrow located on the bottom of the V104n enclosure defines
system orientation. The arrow points in the direction the heading
measurement is computed (when the antenna is installed parallel to the
fore-aft line of the vessel). The secondary antenna is directly above the
arrow.
Supplemental Sensors
The V104n has an integrated gyro and two tilt sensors. The gyro and tilt
sensors are enabled by default. Both supplemental sensors are mounted on
the printed circuit board inside the V104n.
The sensors act to reduce the search volume, which improves heading
startup and reacquisition times. This improves the reliability and accuracy of
selecting the correct heading solution by eliminating other possible,
erroneous solutions. Table 3-1 on page 27 provides a sensor operation
summary.
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