Re: [Discuss-gnuradio] GPS L2C transmissions?

[Peter Monta]

> From my knowledge all the semi-codeless tracking algorithms are 
> heavily patented, and hence cannot be found in textbooks or in any 
> open forum.

But the patents themselves contain pretty good descriptions of the 
techniques;
also there is this paper:

http://www.navcomtech.com/Support/Download/Optimum%20Semi-Codeless%20Carrier%20Phase%20Tracking%20of%20L2.pdf

which summarizes all the options and adds a soft-decision refinement to
Z-tracking.  Some of the patents will expire pretty soon, probably before
L2C is fully usable.

There ought to be a fully open-source, geodetic-quality, dual-frequency (or
tri-frequency once we have L5, or quad- or quint-frequency once we have
Galileo and Glonass and accurate IGS orbits and clock ties for these other
GNSS systems), software receiver.  I have no real connection with any of
this (just a hobbyist), but I'd enjoy having access to state-of-the-art 
timing
and survey solutions.

Finally snagged a dual-frequency antenna on Ebay a few weeks ago, so
only software sits between me and centimeter positioning and subnanosecond
UTC (or UTC(GPS) or UTC(IGS) anyway).

Cheers,
Peter