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Page Title:
Table V. INS Performance at 45 Degree Latitude and 45 Degree True Heading |
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|  MIL-N-81604C(AS)
Para 3.4.1.1.3b
(cont)
avionics equipment, then the equipment is restrict-
ed to operating in the non-doppler modes.
Droppler Inertial - This shall be the primary
(1)
navigation mode when the inertial equipment
is aligned and operational, and a valid dopp-
lersignal is present. The computer shall
determine the doppler validity.Droppler
information, when available, shall be used to
damp the inertial leveling loops; otherwise,
these loops are in an undamped Schuler
configuration.
Intertial - In this mode the equipment shall
(2)
operate under computer control as an unaided
inertial set with-performance characteristics
as specified in table V. This mode may be
selected automatically by the computer if the
CIU MODE switch is set to NORM with an oper-
ating aligned IMU and no valid doppler signals
available.
TABLE V. INS PERFORMANCE AT 45 LATITUDE AND 45 TRUE HEADING
Requirement
I
Characteristic
3.0 arcminutes, 1, and 0.02\hr, 1
Heading
X8 Platform Heading
0.75 arcminutes, 1
Resolver Linearity*
0.75 nautical miles\hour, CEP
Position Error Rate
2.5 arcminutes, l
Pitch and Roll
3.0 feet/second, 1
X, Y, Z Velocity
Minutes.elapsed time: 10 (carrier),
Alignment Time from 50F
8 (ground), 5 (laboratory)
Minutes elapsed time: 12 (carrier),
Alignment Time from -65F
8 (ground)
*Defined as the deviation of any one point on the heading error
curve from the best straight line fit to the heading error
curve.
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