3 ms·
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 th
by kevstev 7y ago
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.
- Johnny555 7y agoThe 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_Positioning_System#Selective_availability https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_...
- jomoio 7y agoThere 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_Augmentation_System_(GBAS) https://www.skybrary.aero/index.php/Ground_Based_Augmentatio...