2 G12 OEM Board & Sensor Reference Manual
Higher altitudes and velocities may be available under validated export license.
Upon application of power, the G12 runs a built-in self test of its internal memory,
and thereafter periodically self-tests various functions during normal operation.
Test results are stored for output on command. After self test, the G12 initializes
its battery-backed RAM. If the battery-backed RAM fails self-test (due, for
example, to a low battery backup condition), the G12 clears and reports the loss
of stored data, then initializes its 12 channels and begins searching for all
satellites within the field of view of its antenna.
The G12 can track all GPS satellites (also called space vehicles or SVs) as
specified in the Navstar GPS Space Segment/Navigation User Interfaces, ICD-
GPS-200, Revision B. All 32 satellite PRN (pseudo-random noise) code numbers
are programmed into the G12’s firmware. There are 24 satellites in the GPS
constellation. As it acquires (locks on to) each satellite, the G12 notes the time
PHYSICAL SPECIFICATIONS
Size Board: 2.300” x 4.250” (± 0.005); 107.95 mm x 57 mm (± 0.13)
Sensor: 178 mm x 105 mm x 52 mm
Weight Board: 2.8 oz
Sensor: 1 lb 4 oz
Humidity 95% non-condensing
Shock RTCA DO-160C - op/crash safety:
• Operational — ± 6 G in X, Y, or Z axis
• Non-operational — ± 15 G in X, Y, or Z axis
Vibration • MIL-STD-810E/Category 10, Minimum Integrity Test - General
(HDMA version only)
• DO 160C - NMB
• Performance:
• 5G sine sweep
• 20 - 400 Hz
• 20 hours/axis
Acceleration 20 G
Maximum speed 1,000 knots
Maximum altitude 60,000 ft
Table 1.1. G12 Specifications (Continued)
G12RevD.book Page 2 Tuesday, April 2, 2002 4:33 PM
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