Avionics News December 2020 - 62

series
B Y

T H O M A S

I N M A N

ADS (more than) B
I

t's the law. Automatic Dependent Surveillance
Broadcast-Out is required now, everywhere
transponders were required previously. There's
more to this than meets the eye. In the avionics classes I
teach at Pennsylvania College of Technology, I refer to it
as Automatic Dependent Surveillance, or ADS, because
there is more going on than the broadcast. Over the last
few years during the rush to equip aircraft with the new
technology, technicians in schools and in the field are
learning new things.
ADS offers several
advantages over
transponder-based
secondary surveillance
radar, which relies on
a transponder in the
aircraft. The original
transponder would
respond to air traffic
control interrogations
with a reply of a fourdigit code, and possibly,
pressure altitude. In
the 1990s, Mode-S
transponder (S for
sequential) came into
being and became a
requirement for some but
not all aircraft. Mode-S
had an advantage over
the original transponder
62

avionics news

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december

2020

system because it could report whether or not the aircraft
was airborne and if the aircraft was flying. Moreover, it
could report a speed range for the aircraft. Advanced Mode-S
transponders could help airliner collision avoidance systems
negotiate solutions to potential collision threats. All Mode-S
transponders broadcast an electronic beacon called a squitter,
which would transmit once per second.
ADS takes the capabilities of the Mode-S transponder
a step further. We can consider ADS a datalink. From the

When we talk of ADS-B In, we are actually describing ADS-R.



Avionics News December 2020

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Avionics News December 2020 - Intro
Avionics News December 2020 - No label
Avionics News December 2020 - Cover2
Avionics News December 2020 - 1
Avionics News December 2020 - 2
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Avionics News December 2020 - 5
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Avionics News December 2020 - Cover3
Avionics News December 2020 - Cover4
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