ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Section I. DEFINITIONS OF SPECIAL TERMS
A
GYROCOMPASSING A capability of advanced
ACCELEROMETER Electric transducer used to
inertial measurement systems (included PADS)
measure linear acceleration.
whereby the system, after startup and receiving
AUTOREFLECTION A method of directing a
position information, will align itself with true
straight line by projecting an image of theodolite
north.
sight to a reflecting plane and then back to the
telescope.
L
AZIMUTH Horizontal angle measured clock-
wise from true north (true azimuth), or from grid
north (grid azimuth), to a line through an ob-
LOCAL VERTICAL Coincident with gravity
served or designated point.
vertical.
B
M
BIT A built-in-test; normally, a test for proper
MIL A unit of angular measurement equal to
functioning.
1/6400 of 360, or approximately 0 03.4' of
arc; approximately equal to 1/1000 of the range,
BITE Built-in-test equipment; components
within an equipment which are used to conduct
N
built-in tests.
E
NORTHING A designation for the distance a
position lies in a north-south direction from a
designated latitude line; in UTM grid, the equa-
EARTH RATES Forces generated by earth's
tor is zero for points in the northern hemisphere;
rotation that affect inertial measurement system
the equator carries an artificial label of 10,000
accuracy. Corrections are applied by computer
kilometers north for points in the southern hemi-
to compensate for the effect of these forces.
sphere.
EASTING The east-west distance of a location
from the central meridian of a grid.
0
F
OPTICAL AZIMUTH TRANSFER Transfer of
orienting line angle information from PADS to a
FAULT INDICATOR An indicator which al-
survey control point by autoreflecting a theodo-
lows an observer to see that the system con-
lite on PADS porro prism.
cerned is functioning properly (black color), or
malfunctioning (white color).
P
G
PORRO PRISM A prism that has two reflecting
surfaces orthogonal to each other.
GYROSCOPE A device, based about a wheel, so
mounted that its spinning axis is free to rotate
about either of tsvo other axes perpendicular to
itself and to each other.
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