Hemisphere GPS V104n, Руководство пользователя

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Chapter 1: Introduction
Overview
The V104n™ GPS Compass is based upon Hemisphere GNSS’ exclusive
Crescent
®
and Crescent Vector™
II
technology.
The V104n is a complete GPS compass and position system in a single
enclosure that requires a standard NMEA 2000 cable connection. With
NMEA 2000 support and ease of installation, the V104n is the perfect
solution for marine-based applications.
The V104n 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 multi-
path mitigation, and fewer components.
The V104n’s GPS antennas are separated by 13.5 cm between their phase
centers, resulting in better than 2° rms heading performance. The V104n
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 V104n 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 V104n is less likely to be affected by differential signal
outages due to signal blockages, weak signals, or interference when using
COAST.