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Nesis III — Bedienungsanleitung
depends on the antenna position, antenna shadowing, device strength, aircraft
material . . . The range is about 10 km at best but may be significantly less
in reality. It can be as low as a few hundred meters and blind spots are also
possible. When the device detects a target – an airplane which has also a
Flarm device on board, it will get a full set of target data: type, position,
speed, etc. This is a directional traffic (or directional target). Flarms are
mostly installed in gliders.
5.1.2
ADS-B in Subsystem
The ADS-B in subsystem listens to transponder replies of other aircraft –
targets. Here are two possibilities:
ˆ The transponder reply comes from an aircraft, which is equipped with
ADS-B out. In this case, the transponder reply also holds information
about aircraft position, speed, direction, etc. Not many small airplanes
are equipped with this. This kind of equipment is mostly found in
airliners and in "more serious" aircraft. Most small GA aircraft and
ULMs do not have such equipment.
ˆ The transponder reply comes from an aircraft, which is NOT equipped
with ADS-B out. These are majority of small aircraft. This reply does
not include position, speed, direction. It has only altitude (C-mode)
and squawk. The device tries to estimate distance of the target based
on the transponder signal strength. A distance can be estimated (not
very reliably) but the direction can not. Such targets are called "non-
directional traffic" (or non-directional targets).
During flying device detects transponder responses from "non-directional"
targets mostly. As direction is not known and distance is only a rough
estimate, their position can not be drawn on the map, but their presence
is announced to the pilot. This means that there may be frequent traffic
advisories from the system, but the actual position of the target is not known.
Such behavior can be turned off, see Section 5.4.
5.2
Verkehr auf der beweglichen Karte
Das Flarm-Ger¨ a t sendet in regelm¨ a ßigen Abst¨ a nden Verkehrsinformationen,
die es erkennt. Ein vertikaler oder horizontaler Filter kann vom Ger¨ a t angewendet
werden, um den Datenverkehr auszublenden und einzugrenzen.
5.2 Verkehr auf der beweglichen Karte
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