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|  MIL-N-81604C(AS)
3.5.4.5 Computer Program - The performance characteristics and
*
requirements as stated in 3.4 will be achieved and controlled
with a computer program uniquely designed to accommodate specific
hardware, aircraft, and mission combinations. The program will
be designed to complement the rapid alignment techniques employed
by the IMU. The program will control the alignment and self-test
of the equipment, as well as the navigation and display functions.
The program may be mechanized to utilize uniquely available
sensors such as doppler radar, air data computert and magnetic
Special noise handling techniques such as Kalman fil-
compass.
tering may be used to effect minimum reaction times. The memory
requirements shall be minimized and shall not exceed 8192 words
of 28 bits in length, with two instructions per word. All oper-
ational computer programs developed for CAINS applications shall
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be documented in accordance with AR-15.
3.5.4.6 Self-Test - The ANCU shall be capable of being program-
med with a diagnostic test which is capable of detecting malfunc-
tions and isolating to the ANCU with 90 percent confidence.
3.5.4.7 Power Requirement - The ANCU shall operate with the
following voltages but shall not exceed the listed power levels:
+28 VDC 5%:
14 watts
30 watts
-28 VDC 5%:
+32 VDC (unregulated) A:
200 watts
+32 VDC (unregulated) B:
50 watts
The allowable variation in the +32 volts d-c is defined in
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3.5.3.3. The above power levels include the power necessary to
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generate 4 amperes maximum steady state, or 6-ampere, 100-msec
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peak transient of +5.1 volts d-c 2 percent which is required by
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the CIU. The ANCU shall receive 26 volts rms analog-to-digital
converter reference from the CAU which shall be in phase with the
IMU synchro excitation. Refer to 3.4.4.1g. In addition, the
*
ANCU shall require no greater than two watts of 115 volt rms/400- *
Hz, single-phase power. The ANCU shall provide an orderly shut-
down of power to protect the memory contents when a power status
discrete is received from the PSU.
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