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Pointing device geodetic or grid azimuth. |
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|  MIL-D-70789A (AR)
6.7 Orientation Parameters.
6.7.1 Pointinq device geodetic or grid azimuth. Pointing
Device Geodetic or Grid Azimuth is the geodetic or grid azimuth
of the axis of the pointing device in the direction of pointing
and is the horizontal angle between geodetic or grid north and
the vertical projection of the axis on the horizontal plane.
Pointing Device Geodetic or Grid Azimuth is measured clockwise
from geodetic or grid north and is always positive. It is
permissible for Pointing Device Geodetic or Grid Azimuth to be in
error when the pointing device's pointing axis is nearly vertical
( 5 degrees).
When the BCU Parameter Configuration Flag is reset, pointing
device grid azimuth shall be calculated and output in terms of
the DRU spheroid and normal or extended hemisphere and UTM zone.
When the BCU Parameter Configuration Flag is set, pointing device
grid azimuth shall be calculated and output in terms of the BCU
spheroid, are and zone.
6.7.2 Pointinq device Pitch. Pointing Device Pitch is the
vertical angle between the projection of the axis of the pointing
device on the horizontal plane and the axis. Pointing Device
Pitch is positive when the axis in the direction of the pointing
lies above the horizontal plane and negative when below.
6.7.3 Pointing device cant. Pointing Device Cant is the
vertical angle between the pointing device cross axis immediately
clockwise from the direction of the pointing and the projection
of that cross axis on the horizontal plane. Pointing Device Cant
is positive when the cross axis lies below the horizontal plane
and negative when above.
6.7.4 Pointing device roll. Pointing Device Roll is the
angle between the horizontal plane and the pointing device-axis
immediately clockwise from the direction of pointing measured in
a plane normal to the pointing device longitudinal axis.
Pointing Device Roll is positive when the cross axis lies below
the horizontal plane and negative when above.
6.7.5 Vehicle geodetic or arid azimuth. Vehicle Geodetic
or Grid Azimuth is the geodetic or grid azimith of the
longitudinal axis of the vehicle in the direction of travel and
is the horizontal angle between geodetic or grid north and the
vertical projection of the longitudinal axis on the horizontal
plane. Vehicle Geodetic or Grid Azimuth is measured clockwise
from geodetic or grid north and is always positive. On receipt
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