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plane, the two light beam phases become slightly different. The
phase of the two light beams are different during the turn
because of the rotation rate. The difference in light beam phase
causes the fringe pattern to move left or right depending on the
direction of gyro movement. Photo diodes in the detector
change the fringe pattern movement into a signal that is equal
to the rotation rate of the gyro.
The measured rotation rate is integrated with time to calculate
the attitude of the airplane.
Dither Motor
During low gyro rotation rates the two light beams can get
coupled together in a condition called laser lock-in. To prevent a
loss of information at low rotation rates, a piezo-electric dither
motor vibrates the gyro assembly through the lock in region.
The gyro sensed signals that are caused by these vibrations,
are de-coupled from the gyro output to prevent errors during
operation.
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Alignment
The ADIRU uses accelerometers and gyros to sense the earth
rotation rate and gravity. Earth rate and gravity are then used to
calculate:
* Local vertical
* True north
* Present position latitude.
After the ADIRU has measured these values and present
position (latitude and longitude) is entered, the ADIRU
completes its alignment to true north and is then ready to
navigate. ADIRS alignment time will vary based on local
latitude.
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General
In the navigation mode, the IR processor uses the initial starting
point and gyro and accelerometer values to calculate attitude,
heading, velocity, and distance flown. The IR processor
contiuously updates this data over time to calculate present
position and all other IR data values.
The IR processor also gets data from the ADR section of the
ADIRU. The IR processor uses this input to calculate some of its
IR data values.
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General
The ADIRU has these three parts:
* Power supply
* Inertial reference (IR)
* Air data reference (ADR).
Power Supply
The power supply receives 115v ac and 28v dc. The ADIRU
operates with either power source. The power supply gives
power to the ADR and the IR. Power also goes to the ISDU and
to the ADMs.
The power supply monitor sends BITE data to the IR section.
The power supply monitors for these conditions:
* AC power failure
* DC power failure.
Inertial Reference
The ISDU or the FMC supplies bite commands and initial
position data to the IR processor. The mode of operation comes
from the MSU. The gyros and accelerometers supply movement
data to the IR processor. The ADR data bus gives altitude,
altitude rate, and true airspeed to the IR processor. The IR uses
this ADR data as part of its inertial altitude, vertical speed and
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