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 mle...@ripnet.com 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.
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