For flights over 30,000', I understand that barometric altitude measurement becomes less accurate?
And, that for records, Tripoli has a list of approved, GPS based altimeters.
How do these GPS altimeters work, given that the GPS unit may lose lock with it's satellites?
Is the altitude somehow still recorded via GPS when this happens?
Is this a situation where someone could place a properly wired and oriented GPS unit like a TeleGPS, or AIM Xtra, in the rocket, and there would almost certainly be a GPS based altitude measure?
If someone builds a rocket that is headed for the thin air, is redundency in GPS based data recording also a 'must?
Cheers.
And, that for records, Tripoli has a list of approved, GPS based altimeters.
How do these GPS altimeters work, given that the GPS unit may lose lock with it's satellites?
Is the altitude somehow still recorded via GPS when this happens?
Is this a situation where someone could place a properly wired and oriented GPS unit like a TeleGPS, or AIM Xtra, in the rocket, and there would almost certainly be a GPS based altitude measure?
If someone builds a rocket that is headed for the thin air, is redundency in GPS based data recording also a 'must?
Cheers.