visibility_shift

ska_sdp_func_python.util.coordinate_support.visibility_shift(uvw, vis, dl, dm)

Shift visibilities by the given image-space distance. This is based on simple FFT laws. It will require kernels to be suitably shifted as well to work correctly.

Parameters:

• uvw – (u,v,w) distribution of projected baselines (in wavelengths)

• vis – Input visibilities

• dl – Horizontal shift distance as directional cosine

• dm – Vertical shift distance as directional cosine

Returns:

New visibilities