Having the sampled live RF for playback into an arbitrary GPS receiver
is a good idea. See my latest GPS World Innovation column for a cost-
effective approach using a USRP:
http://www.nxtbook.com/nxtbooks/questex/gps0512/
Also, many GPS simulators already have the capability of simulating
the leap second for testing receivers ahead of the actual event.
There are many monitoring network GPS (and GPS/GLONASS/whatever)
receivers of different makes/models/vintages operating continuously,
some with data rates as high as 1 Hz or more, that can be checked
after the fact for correct operation through the leap second.
A u-blox GPS receiver handled the leap second correctly, as evidenced
by the NMEA 0183 GPZDA message, during the leap second event of 31
December 2005:
http://www.mail-archive.com/[email protected]/msg00903.html
-- Richard Langley
On 7-May-12, at 4:23 PM, Poul-Henning Kamp wrote:
In message <[email protected]>, David
Malone writes
:
Are anybody are working on making a spectrum recording of GPS
signals
around the leapsecond, for use as test-stimuli for testing leap-
second
handling ?
I suspect that a USRP should be able to do the job ?
If you have the right front end, I guess it would be possible. Would
you just capture a slice around the L1 and L2 frequencies, or try
to capture a big chunk of the band? (I guess a few MHz around L1
would probably be enough to be useful.) I have access to a spectrum
analyser that works in the band, but its memory is probably too
My idea would be at least two hours of L1, suitable to playback
later on...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by
incompetence.
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