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Unread 13-01-2004, 17:08
Dave Flowerday Dave Flowerday is offline
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Re: Misnomers - Please Don't Use

OK, first of all, I'd say there's enough disagreement (not just here, but in general on the web) that we're not going to change each other's minds. Because of that lack of concensus, though, it hardly seems fair to chastise others for using the phrase contradictory to the FAA, especially since most of the writing on the subject with regards to robotics seems to be differerent than the FAA.
Quote:
Originally Posted by Chris Hibner
However, what is not provided in the definitions is the fact that you have no way to truly measure groundspeed, wind speed and course - you can only estimate.
With your wheel encoder, are you really measuring your movement over ground directly? I don't personally think so - you're measuring rotations of a wheel, which only has an association with ground speed because you expect that wheel to be in contact with the ground, to rotate a certain number of times per distance traveled and to not slip. This seems to me to be no different than navigating in an airplane using airspeed - using your airspeed combined with knowledge of winds etc. you think you know your groundspeed, but you can't be sure.

If you put your robot up on a platform and spin your encoder wheel, your robot will think it has moved, won't it? Again, your robot assumed it was measuring groundspeed when it actually wasn't.

Anyway, it's clear we disagree on the definition, so I don't expect you to change your mind and you shouldn't expect me to change mine. I understand your reasoning and accept it, but I still personally believe the prevailing definition of dead reckoning in the world of robotics to be the one I described.