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Page Title:
Horizontal Position odometer mode. |
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|  MIL-D-70789A (AR)
3.6.1.1.1 Horizontal Position odometer mode. Horizontal
position error shall not exceed 10.0 meters Circuiar Error
Probable (CEP) for total odometer distance traveled in the range
of 0 to 4,000 meters from the last position update point. Within
that distance range no more than 1.0 percent of the radial errors
may exceed 26.0 meters.
Horizontal position error shall not exceed 0.25 percent of the
total odometer distance traveled, CEP, for distances traveled
exceeding 4,000 meters from the last position update point. For
distances exceeding 4,000 meters, no more than 1.0 percent of the
radial errors may exceed 0.65 percent of the odometer distance
traveled.
3.6.1.1.2 Altitude odometer mode. Altitude error shall not
exceed 6.7 meters Probable Error (PE) for total odometer distance
traveled in the range of 0 to 10,000 meters from the last
altitude update point. Within that distance range no more than
1.0 percent of the absolute values of altitude errors may exceed
26.0 meters.
Altitude error shall not exceed 0.067 percent of the total
odometer distance traveled, PE for distances traveled exceeding
10,000 meters from the last position update point. For distances
exceeding 10,000 meters, no more than 1.0 percent of the absolute
values of altitude errors may exceed 0.26 percent of the total
odometer distance traveled.
Horizontal Position exclusive ZUPT mode/other.
3.6.1.1.3
When operating in the Exclusive ZUPT Mode with zero-velocity
updates at 4 minute travel intervals, horizontal positioh error
shall not exceed 18 meters Circular Error Probable (CEP) and no
more than 1.0 percent of the radial errors shall exceed 47 meters
for the following conditions:
a. Distance traveled in the range of 0 to 27,000 meters
from the last position update point, latitude within the range of
65 south to 65 north.
b. Distance traveled in the range of 0 to 63,900 x COS
(latitude) meters from the last position update point, latitude
within the range of 65 to 75 south or north.
This requirement shall also apply when operating in the Odometer
mode with zero-velocity updates at 10 minute travel intervals
throughout a mission.
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