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Page Title:
GPS and INS theory and operating characteristics (cont) |
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|  T-45C ADV INav-03
INav Review
c.
A minimum of three GPS satellites are required
for lat/long positioning; four for lat/long/altitude
NOTE: T-45C requires four satellites for full
system operability; does not compute GPS
altitude.
d.
CNO and FAA have not yet (time of this writing)
approved the T-45C for RNav. CNO only
allows (time of this writing) GPS to support
visual navigation
2.
INS 2.1.10.1.1.1.2
Sg 4, fr 7: Inertial Navigation
System (INS)
a.
THEORY: An inertial navigation system
determines aircraft position by sensing three-
dimensional acceleration vectors, whenever the
aircraft moves. Initial alignment establishes a
"level" platform. Initial geographic (lat/long)
position information must be supplied to the
INS if it is to be used for navigation. The T-45C
uses currently sensed GPS position or
waypoint zero (WYPT-0) for that initial position
alignment
Acceleration vectors are derived from two
sources: ring laser gyroscopes, and three axis
(xyz) accelerometer readings
NOTE: The T-45C GPS and INS are linked
together in the Global Positioning System/
Inertiat Navigation Assembly (GINA).
b.
The T-45C INS uses GPS present position
latitude and longitude, when performing initial
position alignment
(2-02) Original
Page 3-16
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