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That helical antenna is gorgeous.

There's a similar project that used an FPGA here: http://www.aholme.co.uk/GPS/Main.htm

That must be one of the most professional looking electronics DIY project I've seen for a while.

That article is where I found the link to this one, actually. The FPGA one is more sophisticated for sure but the article doesn't explain how the GPS signals work quite as well, while the older one does a good job of putting GPS into context.

I think my favorite part of GPS is that it uses CDMA to set all of the transmissions on top of each other on the same frequency channel. It's incredible that this technique can recover signals under the termal noise floor.

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