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MIL-D-70789A (AR)
In Orientation 2, the position offset distances,
are in the pointing device coordinate frame. They are measured
from the DRU case reference frame origin to the offset point on
the pointing device when the pointing device pointing axis and
the offset along the pointing device
cross-axis are level.
pointing axis, is positive if the offset point is forward of the
DRU in the direction of pointing and is negative if behind.
the offset along the pointing device cross-axis, is positive if
the offset point is to the right of the DRU, looking in the
direction of pointing, and is negative if to the left
offset along the pointing device vertical axis, is positive if
the offset point is above the DRU and is negative if below.
3.5.8.4 Odometer scale factor. The nominal odometer scale
factor is [(nominal number of VMS pulses/mile)/(32000
pulses/mile)] 1. The nominal odometer scale factor will be in the
range of 0.750 to 1.250.
3.5.8.5 ZUPT  intervals. The DRU shall request ZUPTs at the
intervals specified in configuration data for both the Odometer
and Exclusive ZUPT Modes of operation. The range for the
Odometer mode shall be 2 - 63 minutes in increments of 1 minute.
The range for the Exclusive ZUPT Mode shall be 2 - 15 minutes in
increments of 0.25 minute.
3.5.8.6 Align time. The maximum Normal Align time shall be
as specified in configuration data. The DRU shall indicate
completion of alignment when the specified align time has been
exceeded. The range for Normal Align shall be 3.5 - 34-0
minutes, in increments of 0.25 minute.
3.5.8.7 Fuel consumption factor. This factor is the change
in vehicle pitch per unit distance travelled due to consumption
of fuel. The units are microradians/kilometer travelled.
The DRU shall use
3.5.8.8 Configuration  definition  flags.
configuration definition flags as follows:
a. Odometer/exclusive  ZUPT  mode.  This  Flag  indicates
the type of aiding mode to be used by the DRU. When set the DRU
shall-assume a VMS is connected and shall operate in the odometer
mode (3.5.3.2.1.3). When reset the DRU shall operate in the
Exclusive ZUPT Mode (3.5.3.2.1.2).
b.  Tracked/wheeled vehicle. When set this flag
indicates to the DRU that it is installed on a tracked vehicle.
When reset it indicates a wheeled vehicle.
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