Fourier Transforms

ska_sdp_func_python.fourier_transforms.fft_coordinates Module

Support for coordinates in FFTs.

Functions

coordinates(npixel)	1D array which spans [-.5, .5[ with 0 at position npixel/2.
grdsf(nu)	Calculate PSWF using an old SDE routine re-written in Python.
w_beam(npixel, field_of_view, w[, cx, cy, ...])	W beam, the fresnel diffraction pattern arising from non-coplanar baselines.

ska_sdp_func_python.fourier_transforms.fft_support Module

FFT support functions.

Functions

extract_mid(a, npixel)	Extract a section from middle of a map.
extract_oversampled(a, xf, yf, ...)	Extract the (xf-th,yf-th) w-kernel from the oversampled parent.
fft(a)	Fourier transformation from image to grid space.
ifft(a)	Fourier transformation from grid to image space.
pad_mid(ff, npixel)	Pad a far field image with zeroes to make it the given size.