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Unread 18-04-2003, 15:08
Eric Reed Eric Reed is offline
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#0481 (De Anza Robotics Team)
 
Join Date: Jun 2001
Location: Richmond, CA
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Eric Reed will become famous soon enoughEric Reed will become famous soon enough
> 3 meters?!
>
> um, how about 3 centimeters?

Actually, that article states 25-30 cm.

I don't think that's on the publicly available GPS, though. The article talks about NavCom giving a 'correction' to GPS. The article is probably talking about 'differential' GPS...which requires a fixed transmitter in addition to the satellites. This is easy to implement on a farm, which is relatively small, but probably much more difficult on a 250 mile course known two hours before the race.

The following site shows standard GPS accuracy in the 10^1 m range...and also shows accuracies for differential GPS:

Navy GPS error site

Regarding the instantaneous vs. average, I have a hunch that the error in GPS has a lot to do with environmental conditions. In this case you are not talking about random error, but an error that would be hard to average out. There is another page on the navy site that seems to support this.

I'm not saying that a DARPA vehicle using DGPS and achieving accuracy below the 30 cm range is impossible, but I think it will be extremely difficult.

Eric.
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