Minimum Aviation System Performance Standards for Aircraft ...

Appendix A
Page A-14
Extended Display Range – Extended display range is the capability of the CDTI to depict traffic at
ranges beyond the standard display range maximum of 40 NM.
Note: An extended display range capability of at least 90 NM from own-ship is desirable for the
ACM application.
Extended Runway Center Line – An extension outwards of the center line of a runway, from one or
both ends of that runway.
Extrapolation – The process of predicting a track’s state forward in time based on the track’s last
kinematic state.
Field of View – The field of view of a CDTI is the geographical region within which the CDTI shows
traffic targets. (Some other documents call this the field of regard.)
Flight Crew – One or more cockpit crew members required for the operation of the aircraft.
Foreground Application – An ASA application that the crew can activate and/or deactivate, the
foreground applications is not intended to run full-time or activate automatically without crew
interaction.
Garble – Garble is either nonsynchronous, in which reply pulses are received from a transponder being
interrogated by some other source (see FRUIT), or synchronous, in which an overlap of reply
pulses occurs when two or more transponders reply to the same interrogation.
Generic Conflict – A violation of parameterized minimum separation criteria for adverse weather,
aircraft traffic, special use airspace, other airspace, turbulence, noise sensitive areas, terrain and
obstacles, etc. There can be different levels or types of conflict based on how the parameters are
defined. Criteria can be either geometry based or time-based.
Geometric height – The minimum altitude above or below a plane tangent to the earth’s ellipsoid as
defined by WGS-84.
Geometric height error – Geometric height error is the error between the true geometric height and the
transmitted geometric height.
Geometric Vertical Accuracy (GVA) – The GVA parameter is a quantized 95% bound of the error of
the reported geometric altitude, specifically the Height Above the WGS-84 Ellipsoid (HAE).
This parameter is derived from the Vertical Figure of Merit (VFOM) output by the position
source.
GNSS sensor integrity risk – The probability of an undetected failure that results in NSE (navigation
system error) that significantly jeopardizes the total system error (TSE) exceeding the
containment limit. [DO-247, §5.2.2.1]
Global Positioning System (GPS) – A space-based positioning, velocity and time system composed of
space, control and user segments. The space segment, when fully operational, will be composed
of 24 satellites in six orbital planes. The control segment consists of five monitor stations, three
ground antennas and a master control station. The user segment consists of antennas and
receiver-processors that provide positioning, velocity, and precise timing to the user.
Ground Speed – The magnitude of the horizontal velocity vector (see velocity). In these MASPS it is
always expressed relative to a frame of reference that is fixed with respect to the earth’s surface
such as the WGS-84 ellipsoid.
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