Garmin GTS 820 TAS, Руководство пилота, Страница: 34 / 40

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Garmin GTS Traffic Systems 190-00587-02 Rev. E
6.8 Ground Traffic Filtering
To reduce nuisance alerts and reduce traffic display clutter, traffic that is on or
near the ground may not be shown on the traffic display or generate traffic alerts.
When ADS-B In is installed and the SURF application is active, on-ground traffic
may be displayed. On-ground traffic will be shown on compatible displays using
distinct symbols if the traffic is tracked using ADS-B In. See the display device
Pilot Guide for the capabilities and symbology used on that display. On-ground
traffic will not generate alerts. There are several methods used for filtering out
ground traffic.
6.8.1 Mode S Targets
Mode S transponders include in their replies an indication of whether the
aircraft is on the ground or in the air. Mode S traffic that indicates the traffic is on
the ground will not be displayed unless SURF is active and the target is tracked
with ADS-B In. This is the only method used to determine whether Mode S
traffic is on the ground.
NOTE : The system does not indicate to the crew which traffic targets are
Mode S equipped.
6.8.2 Radar Altimeter
Radar altitude, if available, may be used to determine which traffic targets are
on the ground. For example, if the current radar altitude is 1000 feet, then traffic
with a relative altitude of -1000 feet would be considered to be on the ground
and would not be displayed unless SURF is active and the target is tracked with
ADS-B In. Ground traffic is only filtered when the radar altitude is less than
1,700 feet.
6.8.3 Calculated Height Above Ground
If radar altitude is not available, calculated height above ground may be used
to filter out ground traffic. Calculated height above ground is used similarly to
how radar altitude is used. Ground traffic is only filtered when the calculated
height above ground is less than 1,700 feet.