最終更新日：2025/12/06
(aviation) The approach course formed by the rear lobe of the signal pattern of a localizer antenna array (the portion of the localizer signal emitted from the rear face of the antenna array), oriented in the reciprocal direction to the primary approach course (i.e., the back course - if a usable back course exists at all - will be rotated 180° from the primary course). Not all localizers produce a usable back-course signal; newer equipment radiates very little signal into the rear and side lobes, not enough to allow for a back-course approach.
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back course
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元となった辞書の項目
back course
名詞
(aviation)
The
approach
course
formed
by
the
rear
lobe
of
the
signal
pattern
of
a
localizer
antenna
array
(the
portion
of
the
localizer
signal
emitted
from
the
rear
face
of
the
antenna
array),
oriented
in
the
reciprocal
direction
to
the
primary
approach
course
(i.e.,
the
back
course
-
if
a
usable
back
course
exists
at
all
-
will
be
rotated
180°
from
the
primary
course).
Not
all
localizers
produce
a
usable
back-course
signal;
newer
equipment
radiates
very
little
signal
into
the
rear
and
side
lobes,
not
enough
to
allow
for
a
back-course
approach.
日本語の意味
航空における、局定位信号のアンテナアレイの背面（リアローブ）から発せられる信号によって形成される進入経路。一次進入コースの逆方向（180°反転）に位置している。
意味（1）
(aviation)
The
approach
course
formed
by
the
rear
lobe
of
the
signal
pattern
of
a
localizer
antenna
array
(the
portion
of
the
localizer
signal
emitted
from
the
rear
face
of
the
antenna
array),
oriented
in
the
reciprocal
direction
to
the
primary
approach
course
(i.e.,
the
back
course
-
if
a
usable
back
course
exists
at
all
-
will
be
rotated
180°
from
the
primary
course).
Not
all
localizers
produce
a
usable
back-course
signal;
newer
equipment
radiates
very
little
signal
into
the
rear
and
side
lobes,
not
enough
to
allow
for
a
back-course
approach.
（ plural ）
