MIL-PRF-52955D
3.3.9.1 Travel intervals. Travel intervals between required zero-velocity stops shall be no
less than the values specified in Table I .
3.3.10 Time to update or establish position and azimuth.
3.3.10.1 Position only. The mean time to update or establish horizontal position and altitude
shall not exceed 5 minutes using the driver's interface (3.4.5.a.) The mean time to update or
establish horizontal position and altitude shall not exceed 15 minutes using the offset interface
(3.4.5.c.) The duration includes the time to perform all crew actions required to establish,
physically mark, and record the position.
3.3.10.2 Position and azimuth. The mean time to establish horizontal position, altitude and
azimuth shall not exceed 20 minutes using the two-position method or offset interface (3.4.5.b, c,
and d.) The duration includes the time to perform all crew actions required to establish,
physically mark, and record the azimuth and the positions of both ends of the OL.
3.3.10.2.1 Two-position azimuth movement time. IPADS shall allow a minimum of 60
seconds to move from the OS to the EOL of a 100 meter OL being established using the two-
position method. The time allowed to traverse the OL shall be increased proportionally for OLs
exceeding 100 meters. The time allowed to move shall not start until the vehicle starts to move
from the OS.
3.3.11 Back-up power. IPADS shall include a rechargeable battery that will automatically
sustain IPADS operation for not less than 15 minutes after loss of external power at ambient
temperatures -22° F (-30° C) and above.
3.3.11.1 Battery charge. IPADS shall automatically charge the back-up battery when the
host vehicle power system is outputting sufficient voltage to charge the vehicle battery. After
IPADS is operated only on the back-up battery for a minimum of 15 minutes, and host vehicle
power is available, the back-up battery shall be sufficiently recharged within 4 hours to support
another 15 minutes of IPADS operation with only the back-up battery, at ambient temperatures
-22° F (-30° C) and above.
3.3.11.2 Overcharge. IPADS shall not overcharge the back-up battery.
3.3.11.3 Battery replacement. When provided with host vehicle power, IPADS operation
shall be maintained while batteries are being replaced.
3.3.12 Power loss. While stationary or moving, IPADS shall not be damaged by:
a. Loss of vehicle power and/or
b. Disconnection or exhaustion of back-up power.
3.3.13 Data retention and maintenance. After normal shutdown or inadvertent loss of
primary and back-up power, IPADS shall:
a. Retain all data needed for operation.
b. Retain all survey data. The power-on ellipsoid and datum shall be those last used prior
to shutdown.
c. Retain user defined ellipsoid and datum parameters.
d. While stationary, retain data required to perform a "hot start".
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