Hi there, for those folks interested in GPS (and Galileo) signal processing with USRP+DBSRX and GNU Radio related stuff, please take a look at the publications available at http://gnss-sdr.org/documentation/publications
We use three VOLK-based correlators for GPS L1 and five for Galileo. An active antenna is also desirable, but any cheap ($20) commercial part should work well. Best regards, Carles On Fri, Sep 6, 2013 at 9:38 PM, Marcus D. Leech <[email protected]> wrote: > On 09/06/2013 03:33 PM, Ian Buckley wrote: > > > Filters will all to some degree attenuate your signal of interest, but > by how much varies dramatically depending on the type and design of the > filter, it could be 0.5dB or 20dB, but the point is that it attenuates > potential interferers and noise by a great amount. An LNA cascaded into a > bandpass filter as close as possible to the antenna is generally an ideal > setup for this type of weak signal work. > > LNA into filter is the line-up we use in radio astronomy, which might be > described as the "limiting case" of weak-signal work. > > A circular-waveguide feedhorn designed for the band of interest will act > as a high-pass filter with a "knee" at the design frequency of the > feedhorn. This, > combined with directionality of a dish is often enough to eliminate the > worst of the interferers *before* the LNA, and then apply a filter after > the LNA. > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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