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Chapter 1: Introduction
Overview
The V104s™ GPS Compass is based upon Hemisphere GNSS’ exclusive
Crescent
®
and Crescent Vector™ II technology.
The V104s is a complete GPS compass and position system in a single
enclosure that requires only one power/data cable connection. With its serial
support and ease of installation, the V104s is the perfect solution for
marine-based applications.
The V104s is an integrated system that houses the following:
• Crescent and Crescent Vector II technology
• Dual integrated GPS antennas
• Power supply
• Single axis gyro
• Tilt sensor on each axis (X and Y axes)
The gyro and tilt sensors are present to improve system performance and to
provide backup heading information in the event that a GPS heading is not
available due to signal blockage.
Crescent Vector II technology supports multiple RF front ends - enabling
tighter coupling of measurements from separate antennas for use in
heading-based products. Users will achieve excellent accuracy and stability
due to Crescent’s more accurate code phase measurements, improved
multipath mitigation, and fewer components.
The V104s’s GPS antennas are separated by 13.5 cm between their phase
centers, resulting in better than 2° rms heading performance. The V104s
provides heading and position updates of up to 10 Hz and delivers position
accuracy of better than 1.0 m 95% of the time when using differential GPS
corrections from Space Based Augmentation Systems (SBAS).
The V104s also features Hemisphere GNSS’ exclusive COAST™ technology
that enables Hemisphere GNSS receivers to utilize old differential GPS
correction data for 40 minutes or more without significantly affecting the
position quality. The V104s is less likely to be affected by differential signal
outages due to signal blockages, weak signals, or interference when using
COAST.
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