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|  MIL-D-70789A (AR)
Reaction time.
3.6.1.2
3.6.1.2.1 Initial alignment. In the Normal Align mode, the
DRU shall be ready to survey within the time specified in
configuration data (3.5.8.6), after application of power, when
operated in the ambient temperature range of -50F (-46C) to
+140F (+60C) and the vehicle is stationary for the entire
period. Initial alignment reaction time includes the total time
needed to energize, achieve thermal control, initialize position
coordinates, align to level and North, perform initial BIT, and
otherwise prepare the DRU for the survey mission. If Normal
Align, is interrupted, reaction time may increase in accordance
with 3.5.3.1.2.
3.6.1.2.2
Stored heading align. Stored Heading Align shall
be completed within the time specified in configuration data
(3.5.8.6) after receipt of the STORED HEADING command or after
application of power if the DRU previously was shut down with a
STORED HEADING SHUTDOWN command. Time to achieve Odometer Mode
operation shall be in accordance with 3.5.3.1.3.
3.6.1.3 Mission length and duration. DRU survey missions
may range from 0 to 100 km in length and a few minutes to 24
hours in duration. System errors shall be sufficiently
controlled to maintain the accuracies specified in 3.6.1.1 when
the DRU is operated during missions within the above ranges.
Position updates at distances traveled no shorter than those
specified in 3.6.1.1.3 and 3.6.1.1.4 are permitted to maintain
accuracies in the Exclusive ZUPT Mode/Other.
3.6.1.4
Alignment
conditions.
3.6.1.4.1 Off level. The DRU shall perform as specified
herein when mounted in any orientation.
3.6.1.4.2 Base motion. The DRU shall perform as specified
herein when the prime system vehicle, while nominally stationary,
is subject to wind buffeting, normal crew movement, engine
vibration, vibration from 60 Hz and 400 Hz engine/generator sets,
and other sources of motion usually found on the battlefield.
3.6.1.5
Survey
conditions.
3.6.1.5.1 Vehicle dynamics. The DRU shall perform as
specified herein when operated within the following vehicle
dynamic envelopes:
a.
In ground vehicles, horizontal velocity within the
range of 0 to 80 miles per hour. While being transported by
helicopter, ground speed within the range of 0 to 200 knots.
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