` Appendix C: Wiring and Electrical Connections
SkyView System Installation Guide - Revision K 17-17
In addition the TEST message with 4096 squawk code information can also be transmitted to
support coordination with ATC radar systems. TEST message transmission status is an
installation option.
In all cases, uncompensated latency due to the transponder is less than 10 milliseconds.
Analysis of the system latency should add this to the latency of the GPS system and the
transmission time of the position data from the GPS to the transponder to determine the
overall latency.
ADS-B Service Levels
ADS-B forms part of the future plans for airspace management, and is being deployed in certain
limited applications. The following summary of the ADS-B service is current at the date of
publication of this manual, but you should be aware that regulatory changes are taking place in
this area, and the most recent regulatory information should be consulted.
There are currently three levels of service that an ADS-B transmitter can provide.
Operational ADS-B
Surveillance
EASA has published the certification requirements for
using ADS-B position information for Air Traffic
Control services in a non-radar environment, AMC20-
24. AMC20-24 includes both technical attributes of
the individual components of an installation and
system attributes for the overall aircraft installation.
AMC20-24 has been adopted as a base standard for
ADS-B surveillance in other parts of the world, and
provides radar-like separation capabilities between
participating IFR aircraft.
Experimental ADS-B
Surveillance
ADS-B trials have taken place in a number of
countries which, because of the experimental nature,
have allowed deviations from the operational
standards represented by AMC20-24, but which have
been based on positional information with
comparable integrity.
There are a number of non-certified applications of
ADS-B technology such as fleet monitoring and traffic
awareness which can be deployed using position
sources of lower integrity which, because the
integrity is reported in the transmissions, are also
compatible with the ADS-B surveillance environment.
There is also a widely publicised fourth level of service in discussion which is the US “Next
Generation” plan, but at the time of publication of this manual a number of key aspects of this
are undefined and no compliance statement against that future plan is practical.
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