T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
1.
Gimbaled: XYZ axes
a.
Allow full 360 degrees freedom of motion
b.
Used in earlier aircraft inertial navigation
systems (INS)
c.
Subject to friction/wear
2.
Prone to drift
a.
Drift is an undesired shift of a spin axis from
original inertial coordinate orientation
b.
Drift causes a more significant effect on
heading and position than on attitude reference
indicators
c.
Can be compensated for mechanically and/or
mathematically
3.
Stabilized platform
a.
Mechanical gyros are initially aligned in a caged
mode
b.
An initial true vertical is sensed by
accelerometers; then, the gyro is torque-
precessed to the true vertical
c.
Earth-rotation (earth-rate) and transport
apparent precession are compensated for using
call-up tables
d.
Gyro is torque-precessed to compensate for
apparent precession
C.
Ring laser INS gyroscopes – generic
1.
Not really gyroscopes, as per the dictionary
definition
a.
No spinning masses
Original (9-98)
Page 24-8
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