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|  MIL-D-70789A (AR)
APPENDIX D
D2 Character
Bit Set
Vehicle Boresight Angles Not Present. The temporarily stored
7
vehicle boresight angles have been cleared by the DRU because of a
configuration code conflict at turnon or detection of altered data
during a mission.
Align Initial Position Parameters, Not Received. Indicates the
6
operator did not enter the initial position parameters. DRU will
align from previously stored position data. (position, altitude,
spheroid)
5
Stored Reading/Attitude NO Good. The DRU has determined that the
stored headingfattitude is not usable.
4
Unable To Complete Align. Initial coordinate or instrument bias
shift errors are too large to complete Normal Align. (3.10.6.1)
Align Interrupt. The DRU/vehicle has moved during first 3.5 min
3
(max) of Normal Align.
2
Position Update Interrupt. The vehicle starts moving while a
position update command is being processed.
Zero Velocity Interrupt. During a mandated zero-velocity update,
1
the vehicle must be stopped. If motion is detected this bit shall
be set.
0
Shutdown Interrupt. The vehicle is moving while a SHUTDOWN command
is being processed.
D3 Character (Vehicle Motion)
Bit Set
7
Motion During Shutdovn Request. Same as above.
6
Motion During Restart Request. DRU will not accept the request
because vehicle has not come to a full stop.
5
Motion During Update Request. DRU will not accept the request
because vehicle is moving.
Insufficient Align Time. DRU has not completed a Normal Align
4
or has accumulated less than 15 minutes stationary time before
receiving a STORED HEADING SHUTDOWN command.
3
POSITION UPDATE BEYOND RANGE OF ZONE EXTENSION. The position in
the update is outside the area covered by the designated extended
zone.
Verify Input Coordinates. Input coordinates are more than
2
2,500 meters from the present DRU position.
Excessive Rates. The vehicle dynamics have exceeded the DRU linear
1
or angular rate capability and survey data may be in error. It
shall not be reset until a Normal Align and position update have
been performed.
Motion with Pointing Device Out of Travel Lock. Indicates the
0
Pointing Device is not in the travel lock position when the vehicle
is moving.
186
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