ment sights are temporarily installed and are used for
inserted into the gun bore, the LOS is brought into
alignment and then removed from the equipment.
exact alignment with the gun-bore axis. Figure 3-10
Others are permanently installed and remain as part of
shows atypical boresight with self-contained optics.
the equipment.
Alignment sights include boresight telescopes and
Self-Contained Optics
self-contained optics.
In alignments that use fixed, self-contained optics,
Boresight Telescopes
the telescope is permanently mounted on a machined
surface and accurately positioned so that the telescope
Boresight telescopes are used to represent the bore
LOS is parallel to the pointing axis of the antenna
axis of a gun. These instruments are designed with
dish. Actual alignment is accomplished by mechanical
self-contained optics in a single unit. The optics and
movement of the antenna dish so that the radar beam
features for positioning the instrument and securing it
is parallel to the telescope LOS or movement of the
in the gun are all part of the unit. Most boresights of
telescope so that it is parallel to the radar beam.
this class are provided with mounting surfaces that fit
Figure 3-11 shows typical fixed, self-contained align-
accurately into the gun bore. When the instrument is
ment sights.
Figure 3-10.—Typical boresight with self-contained optics.
3-8
