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|  MIL-N-81604C(AS)
Para 3.4.4.1b
(cont)
Navigate - The true (high,open, or ANCU power
(1)
off) state of this discrete shall be supplied
from the ANCU to the IMU during the navigate
*
mode of operation (as opposed to the align mode *
of operation) This discrete in its false
state shall cause the quantizer scale factor to
change to 0.004 feet/second/pulse on the IMU
X and Y level velocity outputs.The discrete
in its true state shall cause the quantizer X
and Y level velocity output scale factor to
change to 0.032 feet/second/pulse. The z axis
velocity scale factor shall remain at 0.032
*
feet/second/pulse at all times.This scale
factor change provides the capability of better
velocity resolution during alignment.The line
driver in the ANCU and the line receiver in
the IMU shall be Type B circuits.
Attitude Reference Mode - This discrete output
(2)
from the ANCU shall be supplied to the IMU in
a true, high, open, or ANCU power off) state to
cause the IMU to switch into the attitude ref-
erence mode of operation. The true state shall
be supplied when: the MAG SLV or the FREE
attitude reference mode is selected while under
computer mode control, the ANCU built-in-test
detects a malfunction which prevents proper
inertial navigation, or when the ANCU power is
shut down. When the IMU receives the true
state of this discrete, computer control of the
gyros shall be discontinued and analog leveling
signals shall be supplied to the level gyros.
The input to the azimuth gyro shall be supplied
from the CAU and shall be either the magnetic
slaved heading error signal in the MAG SLV mode
or earth rate in the FREE mode. The line
driver in the ANCU and the line receiver in the
IMU shall be Type B circuits.
(3) IMU Flag Set - The true (low, open, or ANCU
power off) state of this discrete shall be
supplied from the ANCU to the IMU to set the
IMU malfunction flag to the failed state (white).
38
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