1. INSTALLATION
1-6
1.1.3
Summary of mounting conditions
1) All three antennas meet the requirements for single antenna. See
“Conditions for mounting single antenna” on page 1-1.
2) Antenna unit GPS1 should be the antenna closest to the stern.
3) Antenna unit GPS2 should be the antenna closest to the bow.
4) The distance between each antenna should be more than 50 cm and less the
5 m.
5) The distance between antennas should not change by more than 1 cm.
6) No interfering object should be within the triangle formed by the three
antennas.
7) If the direction from GPS1 to GPS2 is seen as a horizontal plane, then they
are aligned with the bow. If not, they should be located within ±30° from the
bow. The amount of offset in the bow direction should be entered in the
equipment as heading offset.
8) The vertical length between baseline 1 (from GPS1 to GPS2) and baseline 2
(from GPS1 to GPS3) shall be more than 50 cm.
9) The vertical length between baseline 2 (from GPS1 to GPS3) and baseline 1
(from GPS1 to GPS2) shall be more than 50 cm.
10) The angle which is formed by GPS1-GPS2-GPS3 should be within 90°.
11) The angle between two antennas should not exceed 30°.
Basic antenna arrangement
•
Viewing from overhead, the basic arrangement should look as below.
•
When viewed from abeam, the plane formed by the three antennas is parallel
with ship.
GPS1
GPS2
GPS3
Top view
More than 50 cm
and within 5 m
More than 50 cm and within 5 m
More than 50 cm
and within 5 m
Basic antenna arrangement (view from overhead)
