Think you're wrong there, baromatic sensor will not override a gps signal. Not only UAV's developped, also satelites and gps receivers. For as far as i understood baromatic sensor jumps in when no reliable gps signal is received, or is switched off. Same for the "compass", yes there is a small electronic compass taking over when gps is not present.
But the accuracy of that tiny compass is nothing compared with a good gps reception, it's for emergency only.
Such an electronic compass is worth nothing in an urban environment with huge steel and concrete structures, a compensating course -and rudder- detector is missing, like there is in vessels and (commercial) airplanes.
Groundlevel is set on zero at startingpoint (causing many crashes already!!) If you start at 200 mtr and let the UAV
climb another 200 mtrs you are actually at 400 mtrs, but flightdata will show 200 mtrs altitude, i know that for shure!
And if you think about it when you look at the flightdata at your screen it's logic; otherwise it should read two values,
Altitude above sealevel and altitude above, or below startingpoint. Tell me, a guy living in the Nepalese mountens receives his Phantom from DHL. How should his Phantom know what sealevel is?
It's a good thing that manutacturers keep an eye on safety, but there should be a limit to what we accept.
We all know we are not allowed to fly in the dark, but does that mean that a lightsensor should be installed on next models, or are we able to see ourselves that the sun is going under.......Next thing is a speedlimiter in our cars, en the story ends with "WHAT??? did you smoke???, we're gonna hang you!!!!!!"
The compass and barometric sensor do in fact play a big part in the P3 setup. GPS altitude is based on the earth being a perfect sphere , not used in human carrying aircraft!!!!! Mean sea level is set by international pressure of 1013mb and that is used by all commercial aircraft flying in the 'airways'
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