Hi Steve,
Very interesting! The model and received spectra are remarkably close
to identical. In fact, it's hard to see any differences as large as 5
dB, such as the spikes around 750 Hz in the top right plot.
I guess the fact that phase differences are mostly in the range +/- 45
deg (at least over the frequency range +/- 750 Hz) must mean that we're
not losing very much potential sensitivity. This is with a TS-2000 at
both ends; I wonder how much it will differ when other rigs are used?
I agree that some sort of fit to the complex cross spectrum is what we
want. In some ways the task seems not very different from our need to
find a smooth baseline noise level in the presence of a bunch of
overlapping JT65 signals.
I'll look at your link on vector fitting.
-- Joe
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