Jonathan,
I've been down the fancy decoding path myself, e.g., the WWV driver,
which is a theoretically optimum linear receiver. However, much of the
crud found at WWVB and DCF77 frequencies is bursty, which is what my
LORAN-C receiver and program is good for. The Spectracom receiver is
actually quite good: however, it was designed to cope with Gaussian
noise, not suffer a 20-dB clobber by an interfering buzzsaw signal.
My precerred approach, should I accept the assignement, would be to tap
onto the I and Q baseband signals in the radio, chop at something like
10 kHz and feed to the L and R inputs on a sound card. I can take it
from there. My problemis that the SNR has become so degraded that the
very good PLL in the radio doesn't lock up.
Dave
Jonathan Buzzard wrote:
On Tue, 18 Apr 2006 02:19:58 +0000, Danny Mayer wrote:
Jonathan Buzzard wrote:
At the moment it exists as a Matlab program that runs against a previously
recorded HBG signal, that I normally cannot decode reliably with the
simplistic methods. However the Matlab program can decode the signal
accurately better than 90% of the time. It will need converting into C and
made to work in real time to be useful however.
JAB.
Normally I'd suggesting running the MatLab compiler which can convert it
to a binary but the overhead can be horrendous. I've done it but I don't
think you'd be happy with the time it would need to run your algorithm.
I would not be happy with the resultant code. Using Matlab is purely an
algorithm development tool. Once I am happy with the algorithm I will
rewrite it in C.
JAB.
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