how to f-k filter

Question

David Craig 2012-4-13

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评论： cao jianfwng 2017-2-20

Hi, I have time-space data from several stations in a linear array. I want to look at the data in the frequency-wavenumber (f-k) domain so I can filter out some of the signal, as velocities that overlap in the time-space domain are distinct in f-k domain. I know I need to preform a double Fourier transform, filter the data and do the inverse transform. I can do this with something like, real(ifft2(fft2(data)*F)) where F is the filter matrix. However I am not sure what form the data should take. Since it comes from an array do I need to stack the data or preform above operation on each element in the array?? thanks

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Answer 1

Rick Rosson 2012-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/35407-how-to-f-k-filter#answer_44430

The variable data should be an array of size M rows by N columns. Each row should represent a different time increment, and each column should represent a different location in the linear array. The time increments and the locations in the linear array must be uniformly spaced.

HTH.