Using MATLAB to Integrate Data that has a Sinusoidal Signature
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Hello,
I am currently working with datasets that yield angular rate in radians/sec. The plots from this rate data are sinusoidal, and I need to find the angles in radians. I attempted to use the cumtrapz MATLAB function, and it integrates (I can retrieve the original signal via delta_integrated_data/delta_time); however, I don't think it is integrating correctly based on the nature of the signal, i.e., a signal with amplitude, phase, and frequency. I was expecting something that resembled -cosine +C since the original signal resembled sine. I attached a figure of the angular rate and a figure of the integrated angular rate. Is there an alternate approach that could be taken? Would using the symbolic toolbox somehow be better? Or, am I overthinking this matter? Feedback is much appreciated. Thanks!
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Star Strider
2017-11-10
The ‘Angular Rate’ signal is offset from zero (the mean appears to be 0.06), and cumtrapz is integrating that constant offset (as a constant-of-integration) as well.
I would subtract the mean of your ‘Angular Rate’ signal from your ‘Angular Rate’ signal before integrating it.
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