T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
PROGRESS CHECK
Question 1 -- 1.7.7.6.1, 1.7.7.6.3
As relating to an INS, what is the primary usage of a ring
laser gyro assembly, versus, the accelerometer assembly?
ANSWER: The laser assembly is used primarily to detect
angular motions: pitch, roll, and heading changes. The
accelerometers are used to detect linear motions: velocities
derived from accelerations.
Question 2 -- 1.7.7.6.4
What type(s) of precession affect ring laser gyros?
ANSWER: Only apparent precession: earth-rate and transport.
Real precession is not a factor relevant to ring laser gyros.
II.
LITTON GINA INS design 1.7.7.6.3
Sg 2, fr 1
Lesson Organization
INSTRUCTOR NOTES
A LITTON inertial navigation system is an integral part of the
GINA. It is a second generation LITTON ring laser gyro, which
that company terms the Zero-Lock™ Laser Gyro (ZLG™). Its
design is unique, because unlike competitor designs, it contains
no moving parts. LITTON accomplished that by using optical
laser beam biasing, thus, eliminating the need for mechanical
dithering of the beams. This ring laser gyro system is from the
LITTON LN-100 product family. Other military applications
include the Apache Longbow and Comanche helicopters,
F-18E/F, and the F-22 fighter.
Original (9-98)
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