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Unread 17-10-2013, 12:52
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Re: GPS at FRC Regionals?

Quote:
Originally Posted by wireties View Post
GPS is a line-of-sight technology. It pretty much does not work indoors.
Commercial GPS receivers do not give us the resolution necessary for FRC.
Differential GPS (like that provided by the Coast Guard for coastal navigation) is much better (maybe a few feet) but stiii not good enough for FRC. But some other radio-based navigation element would be cool in autonomous mode, perhaps a simple directional beacon of some sort?
Quote:
GPS has been tested by several teams in several venues with disappointing results. Many modern venues have too much steel in the roof deck to get a good GPS lock.
As I described, adding multiple repeaters on the roof of the venue and re-transmitting the GPS signals indoors would resolve the indoor tracking issues. Differential GPS can provide inches, not feet of precision -- which is plenty of resolution for the FRC field.

Here's a quick article/caption that mentions the concept:
http://www.engadget.com/2007/02/21/u...your-position/

Apart from this, creating a local positioning system environment as described in this thread may be feasible using an RF based system (rather than attempting to detect field objects visually, which in my experience has been quite error prone due to unknown and varying field lighting conditions)
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