Quantcast GPS and INS theory and operating characteristics (Cont) - P-12820065

 

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T-45C TS INav-02
Introduction to INav and Voice Procedures
14. 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.
15. GPS equipment used for IFR navigation must be
approved by the FAA [also by DoD for military
aircraft]
16. Aircraft using approved GPS for IFR navigation
must also have an approved operational alternate
means of navigation
17. FAA considers aircraft navigating with GPS to be
Area Navigation (RNAV) capable; flight plans
should be so annotated with the appropriate code
following aircraft type
18. 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
B.
INS 2.1.10.1.1.1.2
Sg 9, fr 7
Inertial Navigation
1.
THEORY: An inertial navigation system determines
System (INS)
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/Inertial Navigation
Assembly (GINA).
Page 2-24
(2-02) Original


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