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[mathcad] Re: DSP method
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Author: Eden Mei
Posted: Mon, 16 Jan 2006 12:43:20 -0800
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You could, but it's not obvious that you'll get much more mileage, since
those peaks tend to be broad.
You might do better using extrapolation from the sides of the distribution,
e.g., extend the slopes of each side and use the intersection. That's
basically the techique used in star trackers.
TTFN
From: "Mark Smith" "mark.smith"
To: "Mathcad Discussion List" "mathcad"
Sent: Monday, January 16, 2006 3:00 AM
Subject: [mathcad] Re: DSP method
> Hi again
> Thanks to all who pointed me in the right direction of cross correlation.
> I have a secondary question which hopefully someone might have an answer
to.
> I have done the cross correlation and plot its value against the shift to
> find the maxima i.e. at what delay the 2 traces are most similar.
> Is it valid for me to fit a polynomial to the points around the maximum &
> solve for the maximum at a point intermediate to the sample points. In
other
> words can I resolve a time delay less than the period between samples or
> must I increase the sample rate?
>
> thanks again
> regards
> mark
>
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