MIL-PRF-52955D
3.3.5.2.1 Excessive motion. IPADS shall automatically revert to normal initialization if it
was moved and cannot meet the survey accuracies specified in Table I with "hot start"
initialization.
3.3.5.3 Moving base initialization. When acceptable GPS data are available and IPADS is
moving, IPADS shall meet the accuracy requirements of 3.3.7 when initialization is complete.
3.3.5.3.1 Interrupted normal initialization. When normal initialization is interrupted by
motion, IPADS shall continue to initialize if acceptable GPS data are available.
3.3.5.3.2 Interrupted moving base initialization. When the host vehicle is stopped during
moving base initialization, initialization shall revert to normal initialization.
3.3.5.3.3 Interrupted GPS reception. Initialization shall continue when GPS reception is
restored after interruption during moving base initialization.
3.3.6 Operating modes.
High order survey. IPADS shall have a high order survey mode.
3.3.6.1
Lower order survey. IPADS shall have a lower order survey mode.
3.3.6.2
3.3.6.3 Unadjusted survey. IPADS shall operate as specified herein when furnished no
information other than the horizontal position and altitude coordinates of the starting point
entered during initialization.
TABLE I. IPADS performance requirements.
0° - 65° N/S
65° -75° N/S (T)
Latitude of Operation
80° - 65° S,
65° - 84° N (O)
Survey Order
High
Lower
High
Lower
Initialization Time (minutes)
10.0
10.0
20.0
20.0
"Hot Start" Initialization Time (minutes)
5.0
5.0
10.0
10.0
Zero-velocity update interval (minutes)
5.0 (T)
10.0 (T)
5.0 (T)
10.0 (T)
10.0 (O)
20.0 (O)
10.0 (O)
20.0 (O)
Horizontal position (meters)
CEP
4.0
7.0
4.0
7.0
99% radial errors
10.4
18.2
10.4
18.2
Altitude (meters)
PE
2.0
3.0
2.0
3.0
±7.8
±11.7
±7.8
±11.7
99% errors
Azimuth error (mils)
PE
0.4
0.4
0.6
0.6
±1.6
±1.6
±2.3
±2.3
99% errors
3.3.6.4 Adjusted survey. IPADS shall adjust the data for a survey traverse leg, to minimize
error, when provided with the known coordinates of the SCP ending the leg, when no GPS aiding
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