**two dimensional chirp z-transform**

From

**Yu Jiali**@21:1/5 to

**All** on Fri Oct 23 03:08:53 2020

Hello All,

would anyone please give me an illustration how to perform 2D czt in matlab? I use the row-column method used in normal fft to perform 2D czt transform on the Gaussian signal.

amp=exp(-pi*(X.^2+Y.^2)/w0^2);

tmp2=czt(amp,M,wx,ax);

amp_f2=czt(tmp2.',N,wy,ay);

The result doesn't make sense since Gaussian should remain as Gaussian after czt.

Originally, I think the signal is required to be shift to assure that zero-frequency is located at [0,0]. Thus, I tried tmp2=czt(ifftshift(amp),M,wx,ax). And the result is weird with many segments of original signal.

Could any expert give me some suggestions how to achieve it? Thanks for your attentions.

Regards,

Jennifer

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