Home' RTCA Documents for Review : DO-201B User Requirements for Navigation Data Contents ED-77A/DO-201BforOpenConsultation/FRAC
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Navigation database information also supports avionics functions dedicated to non-
precision approaches. For example, the Airbus FMS Landing System (FLS) and Boeing
Integrated Approach Navigation (IAN) features allow non-precision approaches (RNAV,
VOR, VOR/DME, NDB, NDB/DME, GPS) to be conducted in a similar manner to
ILS/MLS/GLS approaches in terms of pilot procedures, display, guidance, and warnings.
To this end, an approach beam is defined based on information in the navigation
database. Then, lateral and vertical deviations between the approach beam and the
calculated aircraft position are computed and displayed to the pilot.
The function is autonomous and does not require additional information from the ground.
As a consequence, the function requires precise navigation data for determining
approach beam direction and anchor point parameters:
Missed approach point: latitude, longitude, elevation and ident
Runway threshold: latitude, longitude, elevation
Local magnetic variation
Final approach course
Vertical angle for approach
MISSION PLANNING SYSTEMS
Mission Planning is a superset of traditional flight planning typically associated with
military aircraft. It is an application that uses a navigation database as one input to allow
planners to create or modify a flight plan that would include departure, enroute and
arrival procedures as well as other aspects of a mission. The standard procedures from
a traditional navigational database are common with non-military aircraft. The additional
functions include aerial refueling, air drop missions, search and rescue, airborne radar
and Military Training Routes (MTR).
Mission planning involves the creation of a flight plan based on threats, targets, terrain,
weather, aircraft performance capability, and configuration. The planner must have the
ability to plan payload, cargo, passenger, and/or fuel delivery, calculate fuel
requirements, and assess the route based on known threat location and type. Mission
planners must be able to optimize and de-conflict flight routes with other aircraft and
download pertinent flight information to on-board aircraft avionics. The flight plan may
be loaded separated or in conjunction with the loading of the navigational database.
Additional capabilities needed in the navigation database include aerial refueling tracks
and airborne radar orbits.
Simulation is used to imitate real-world processes for testing and training. Navigation
data used in simulator-based testing need to be adequate to cover conditions defined
in verification and validation tests for applications using navigation data. Some
simulators may use tailored navigation data unique to an application’s test procedures.
Flight simulators are used in all phases of flight training/education, including pilot type
ratings and regularly scheduled mission rehearsals. For simulation purposes, precise
navigation data is needed for realistic training. Navigation data needs to be aligned with
the information used by the simulator’s visual system. The only common reference
system that these distinct systems share is an absolute positioning system based on
RADIO NAVIGATION/COMMUNICATION SYSTEMS
Airborne radio navigation / communication systems are used to tune a radio frequency
to respectively provide a navigation capability or voice and data communications.
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