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A comment on Air-Traffic Control Is in the Midst of a Major Change from Radar to GPS. Parent comment

Re:Air-Traffic Control Is in the Midst of a Major Change fro... by kevstev on Friday January 24, 2020 @10:30AM (#22139065)
Isn't low precision something like +/- 15 feet? For ATC, that seems more than good enough when they keep jets a mile+ apart. It just needs to be more precise than radar.
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Re:Air-Traffic Control Is in the Midst of a Major Change fro... by Johnny555 on Friday January 24, 2020 @10:39AM (#22139157)
The government claims that they won't enable selective availability any more (which is less useful as a protective mechanism anyway since multi-protocol receivers can use GPS / Galileo / GLONASS / Beidou).

But if SA was enabled:

Before it was turned off on May 2, 2000, typical SA errors were about 50 m (164 ft) horizontally and about 100 m (328 ft) vertically

https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_...

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Re:Air-Traffic Control Is in the Midst of a Major Change fro... by jomoio on Friday January 24, 2020 @10:45AM (#22139211)
There are also ground based systems at airports which increase reliability / integrity for things like simultaneous parallel approaches. [1] says to within +/- 1m horizontal and vertical.

[1] https://www.skybrary.aero/index.php/Ground_Based_Augmentatio...

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