I am having trouble with all of the forums that I have looked at thus far. I have one day's worth of Sonic Anemometer data. I want to see the spectral analysis of this data. When the anemometer data was being logged it appears that the frequency ranges between 31 and 32 hz. I am looking to analyze this data in thirty minute chunks and I would just like some guidance as to how to go about this.
I have already removed the bad data (stray data points with 98 m/s winds x.x). I am not sure if I am supposed to detrend the data then apply a Hamming window and take the Fourier transform, or if I'm supposed to just apply the Hamming window and then take the Fourier transform.
Also should I calculate the sampling frequency for each 30 minute interval since it appears to change or is that change insignificant? (or should I analyze the whole data set together?)
Sorry for the long post but I have been hacking away on forums all week and I cannot seem to find a consistent solution.