T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
b.
No physical “rigidity” in space
INSTRUCTOR NOTES
Ring laser “gyroscopes” are so-termed, because they provide
the same type information as mechanical gyros, with respect to
a stable attitude reference platform. The physics involved is
totally different, but practical results are the same.
2.
XYZ axes within laser assemblies are firmly
mounted to their container
a.
No gimbal mountings for six-degrees freedom
of movement
b.
Some ring laser assembly manufacturers
incorporate moving mirrors to perform laser
beam “dithering”
c.
Other manufacturers eliminate all moving parts
in the laser assembly, accomplishing dithering
by other means
NOTE: There are no moving parts in the
LITTON ring laser used in the T-45C GINA.
3.
Measures angular motions
4.
Stabilized platform
a.
The true vertical is sensed by accelerometers
during alignment, and the platform is
mathematically leveled
b.
Earth-rate precession is compensated for using
call-up tables and mathematical corrections,
rather than mechanical corrections
c.
Transport precession is compensated for
mathematically
Original (9-98)
Page 24-9
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