V103/113 Vector User Guide Chapter 3 - Operation Page 27 of 35
Automatic SBAS Tracking
The V103/113 automatically scans and tracks SBAS signals without the need to tune the receiver. The V103/113
features two-channel tracking that provides an enhanced ability to maintain a lock on an SBAS satellite when more
than one satellite is in view. This redundant tracking approach results in more consistent tracking of an SBAS
signal in areas where signal blockage of a satellite is possible.
Beacon Operation
Many marine authorities, such as coast guards, have installed networks of radio- beacons that broadcast DGNSS
corrections to users of this system. With the increasing utility of these networks for terrestrial applications, there is
an increasing trend toward densification of these networks inland. The dual channel beacon receiver in the V113
can operate in manual or automatic tuning mode, or, using database mode, will select the closest station in
compliance with IEC61108-4 standards.
V103/113 Overview
The V103/113 provides accurate and reliable heading and position information at high update rates. To accomplish
this task, the V103/113 uses a high performance GNSS receiver and two antennas for GNSS signal processing.
One antenna is designated as the primary GNSS antenna and the other is the secondary GNSS antenna. Positions
computed by the V103/113 are referenced to the phase center of the primary GNSS antenna. Heading data
references the Vector formed from the primary GNSS antenna phase center to the secondary GNSS antenna
phase center.
The heading arrow located on the bottom of the V103/113 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.
Fixed Baseline Moving Base Station RTK
The V103/113’s internal GNSS receiver uses both the L1 GPS and GLONASS C/A code and carrier phase data to
compute the location of the secondary GNSS antenna in relation to the primary GNSS antenna with a very high
sub-centimeter level of precision. The technique of computing the location of the secondary GNSS antenna with
respect to the primary antenna, when the primary antenna is moving, is often referred to as moving base station
Real Time Kinematic (or moving base station RTK).
Generally, RTK technology is very sophisticated and requires a significant number of possible solutions to be
analyzed where various combinations of integer numbers of L1 wavelengths to each satellite intersect within a
certain search volume. The integer number of wavelengths is often referred to as the “ambiguity” as they are
initially ambiguous at the start of the RTK solution.
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