RE: [Discuss-gnuradio] GPS L2C transmissions?

[Heckler, Gregory W. (GSFC-596.0)]

Peter:

Yeah, it really sucks. If you look at IS-GPS-200D at table 20-VIII the 6 bit SV health message has a value that indicates "L2C Signal Has No Data Modulation", unfortunately the Air Force is not following their own ICD. From my knowledge all the semi-codeless tracking algorithms are heavily patented, and hence cannot be found in textbooks or in any open forum.

-----Original Message-----
From: Peter Monta [mailto:address@hidden]
Sent: Fri 8/8/2008 6:50 PM
To: Heckler, Gregory W. (GSFC-596.0)
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] GPS L2C transmissions?


>  I can verify that there is NO DATA on any of the L2C capable SVs.

Ah.  I'd thought from the ICD that the only valid options were legacy
data or
new data.  While I understand that this is all pre-operational, it would be
nice to have some rough guidelines from the GPS people about what to
expect with the on-orbit L2C signals over the next year or two.


> Check out www.gps-sdr.com for more info.

Very interesting---thanks!

Would you know if there are any open implementations of P/Y semicodeless?

Cheers,
Peter