Building a GPS Receiver

I am a Land Surveyor and software developer that is very interested in
building a GPS receiver that uses an off-the-shelf commercial GPS receiver
and open source software.

I had a couple questions for this mailing list. I'm hoping to determine if
this is a project that I can tackle.

[1] Is there any active development on a "homegrown" GPS receiver? If so
which project? Would I be able to help with those development efforts?

[2] I'm not very familiar with low-level programming and digital
electronics. I do know some basic prinicples of logic circuit design and
dabble in the C programming language. I do have a lot of experience with
high-level programming languages, and lots of time using survey-grade GPS. I
am a Linux user, but I'm no Unix pro. I am willing to learn new skills, but
am I getting in over my head if I try to build my own GPS receiver?

Thanks,

Scott Huey

P.S. - If I can get this thing to work I will be developing GPS data
collection software for mobile devices. This would be released back to the
community under an open source license. (Probably GPL.)

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