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