Velocity decontamination by cospectral methods

1. Short page on cospectral techniques for wave pumped surface buoys, and standard coherence (similar to shear probe techniques) when the contamination is vibration related.

• Basically, if you need to decontaminate the spectra for motion using any cospectral technique.. you must ensure a fairly large degrees of freedom so that the calculation is meaningful.
• As a rule of thumb, I like to target over 50 dof, which is achievable when using

** 7 blocks i.e., diss-length that is 4x fft-length and  band-averaging over 3 frequencies to retain samples over the lower frequencies (and increase number of spectral obs over the inertial subrange)
** 9 blocks i.e., diss-length that is 5x fft-length (no band-averaging)