3 ms·
Engaging with the substance of the suggestion ... * What would the Central Limit Theorem give us if a significant number of wheels on loco's and carriages were
by defrost 10mo ago
Engaging with the substance of the suggestion ...
* What would the Central Limit Theorem give us if a significant number of wheels on loco's and carriages were instrumented and ID logged over the years.
* What drift patterns and correction factors can be observed and fine tuned by passing {many} wheel streams through station to station and line end to line end "known distance" corrections.
For half a century or so aircraft height was largely done with air pressure alone.
To this day GPS accuracy is "improved" by logging the "drift" of fixed point stations giving us filter coefficients to correct for atmospheric wobble, acute angle uncertainty, as yet uncorrected time drift, etc.
- goodcanadian 10mo agoFor half a century or so aircraft height was largely done with air pressure alone. It still is. Flight levels (20000 feet and above in the US) are defined by air pressure without reference to current atmospheric conditions (i.e. the actual altitude of FL200 can vary based on atmospheric conditions). Below 19000 feet, altimeters are calibrated to local conditions which are given to the pilots by air traffic control.
- defrost 10mo agoStill used, sure, but not solely ( 'alone' ) - it's augmented by GPS height, feedback from ground radar, onboard radar facing down and forward, etc. See: https://en.wikipedia.org/wiki/Altimeter https://en.wikipedia.org/wiki/Altimeter that list five types (including trad. air pressure type)