Avionics News January 2021 - 54

ADS-B AFTER A YEAR
Continued from page 53

of wide area augmentation system, or WAAS - enhanced
the accuracy of GPS alone. ADS-B Out - what the
individual aircraft broadcasts - suffers from none of
the inaccuracy sources inherent in ground-based radar
tracking. The accuracy of the broadcast data remains
unchanged by the speed of the target, its distance from
the ground station, or inclement weather - all issues for
surveillance using ground-based radar.
With ground-based radar, accuracy deteriorates as the
target flies farther from the tracking radar. The lessaccurate the position report effects accuracy in all three
dimensions, and that accuracy deterioration underpins
separation standards, limiting them to the radar's known
flaws.
ADS-B Out, conversely, leverages the high level
of accuracy of WAAS GPS by reporting the data of a

compliant aircraft's GPS - position, altitude, ground
speed and flight vector - multiple times a minute, and
with no deterioration from distance or altitude. The
result is the ability to tighten separation standards - both
in terminal airspace and in the en route environment.
That reduced separation provides more capacity in
the managed airspace and, at some airports with the
appropriate physical infrastructure, higher runway
acceptance rates - the equivalent of adding more
concrete.
But these improvements come with some other
changes pilots and operators may not always expect.
The shrinking VOR network - and altered
instrument approaches
Laying the groundwork for a surveillance and traffic
management system supported by ADS-B wasn't the
only activity the FAA undertook in its preparation for
Jan. 1, 2020. For years, the FAA noted that concomitant

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54

avionics news

*

january

2021


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Avionics News January 2021

Table of Contents for the Digital Edition of Avionics News January 2021

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Avionics News January 2021 - Intro
Avionics News January 2021 - No label
Avionics News January 2021 - Cover2
Avionics News January 2021 - 1
Avionics News January 2021 - 2
Avionics News January 2021 - 3
Avionics News January 2021 - 4
Avionics News January 2021 - 5
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Avionics News January 2021 - Cover3
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