REFLECTOR: ADS-B Categories

[Clayton Chase]

It means enhanced surveillance.  I don't know much about it.

Eurocontrol Mode S Program

Beginning in the mid-1990s, the aircraft surveillance system used in core
European airspace was reaching capacity. To allow for continued growth, the
Mode S program was launched as a replacement for SSR using Mode A/C
transponders. The program became fully operational in 2009. There are
currently two levels of SSR Mode S, Mode S Elementary Surveillance (ELS),
and Mode S Enhanced Surveillance (EHS).
Mode S ELS

Mode S ELS is currently required for IFR flights in the airspace over much
of Europe, including: Belgium, France, Germany, Luxembourg, the
Netherlands, Switzerland, Italy, the Czech Republic, Hungary and Greece.

One of the key benefits of Mode S ELS is the assignment to each aircraft of
a unique ICAO 24-bit address by the state of registry. Mode S ELS uses this
unique 24-bit aircraft address for selective interrogation and to acquire
down linked aircraft identification, known as Flight ID or aircraft call
sign. The technology also allows ATC equipment to acquire altitude in 25
foot increments.
Mode S EHS

Aircraft with a maximum takeoff weight greater than 12,566 lbs (5,700 kg)
or a maximum cruise true airspeed greater than 250 knots must be equipped
with Mode S EHS to operate in the United Kingdom, Germany and France.

EHS is intended to provide additional information about an aircraft's state
and intent for use by air traffic controllers. It includes the elements of
information (called Downlink Aircraft Parameters - DAPs). The DAPs include:

   - Magnetic heading
   - Indicated airspeed / Mach Number
   - Vertical Rate
   - Roll Angle
   - Track Angle Rate
   - True Track Angle
   - Ground Speed
   - Selected Altitude

This information is designed to offer improved situational awareness for
air traffic control while reducing radio congestion. Access by controllers
to aircraft intent DAPs allows cross-checking of climb/descent instructions
and help the early identification of potential loss of separation incidents


On Sat, Mar 29, 2014 at 1:40 PM, John Dibble <aminetech at bluefrog.com> wrote:

> Anyone know what "ENH Surv"  means in the attached pic?  I'm updating my
> profile on DUATS.
>
> Thanks,
>
> John
>
>
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