fit curve to oscillatory data

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Very Determined
Very Determined 2020-2-10
I have a set of data (an example is attached) and I want to fit the a specific curve and find a parameter. However, I am so new this this signal processing world and I am confused with the different terms and commands. I have this function for one sinisoida wave where i is sqrt(-1); ω is angualr frequency; t is time and B and c are constatnts where B is not known. I imagine for a wave like what I have attached it should be . Σ comes into play since the signal shape tells that it is a combination of sinosoidal waves otherwise there would be no Σ in the formula.
Anybody can help me doing this in order to find the right fit to the dat to find B ? (my understanding is that it might be where Bj is connected to each wave that can perhaps be found using Fourier series; not sure anyway)
Thanks

回答(1 个)

Very Determined
Very Determined 2020-2-12
This code helps solving the problem, However, it needs some modifications and setting treshholds.

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