Quantcast GPS and INS theory and operating characteristics (Cont) - P-12820064

 

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T-45C TS INav-02
Introduction to INav and Voice Procedures
7.
FAA has approved U.S. civil operators to use GPS
as a primary navigation means in oceanic airspace
and in some other designated remote airspace
areas
8.
GPS Standard Position Service (SPS) has 100
meters horizontal positioning accuracy with a
9.
GPS Precise Positioning Service (PPS) is limited to
authorized U.S. and allied military, federal government,
and civil users who can satisfy specific U.S. security
requirements. PPS requires use of government
authorized crypto-keys. PPS is highly accurate,
averaging 16 meters
10. Differential GPS is being considered by FAA for
certification as a terminal precision approach system.
At the time of this writing FAA had not approved any
GPS system for precision approaches
NOTE: Differential GPS systems transmit a GPS
signal correction factor that is valid for a local area.
Receiving aircraft process that factor along with their
received GPS signals, which produces the level of
accuracy necessary for precision approaches.
11. At least five GPS satellites are in view at any one
time from any place on earth
12. Improved GPS satellites are being designed and
planned for future launch
13. Receiver Autonomous Integrity Monitoring (RAIM) is
a GPS means of determining when a satellite is
providing corrupted information due to jamming or
other reasons
NOTE: RAIM usage requires additional satellite(s)
to be in view, the exact number depends upon the
particular GPS receiver capability and degree of
RAIM capability to be utilized. The T-45C does not
use RAIM.
Page 2-23
(2-02) Original


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