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Re: [Discuss-gnuradio] GPS L2C transmissions?

From: Peter Monta
Subject: Re: [Discuss-gnuradio] GPS L2C transmissions?
Date: Sat, 09 Aug 2008 19:55:14 -0700
User-agent: Thunderbird (X11/20080501)

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:


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).


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