On the chance that there are GPS folks here that are
familiar with the status of the new L2C signals: is there
a currently-maintained list of which satellite is emitting
what? In particular, PRN 29 seems to have no L2C (or
at least none that I can acquire), while PRN 31 has a nice
strong carrier (tracked with L2CM) but no NAV or CNAV data
modulation—it’s apparently sending only carrier. I’d
like to find a signal with CNAV data.
While I haven’t tried it yet, the USRP should be capable
of saving to disk both L1 and L2C using a pair of dbsrx
daughtercards. That should permit dual-frequency
receiver software. It would be nice to have a
waveform-pair-to-RINEX tool to allow use of the various
web services for dual-frequency solutions.