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The channel-to-channel migration of radio interferometric baselines for thesame antenna separation causes a flat spectrum source that should have remainedin the zeroth delay (line-of-sight) mode to become centered around a highermode - the geometric delay for that particular antenna separation with a spread(spill-over) of the order of reciprocal bandwidth. While in principle anerrorless gridding interpolation can remove inter-channel migration,intra-channel baseline migration exists due to the non-zero width (resolution)of the instrument's spectral channel arising from the finite-period integrationin a DFT cycle. Here for the first time, we analyze this effect and quantify itusing the case of a flat-spectrum point source. We find that the visibilityundergoes an attenuation, the extent of which depends on the auto-correlationof the window function used for DFT and is more towards the lower-end of theband. This causes the spill-over of the delay mode to extend beyond thereciprocal bandwidth order.

Effect of intra-channel baseline migration on the measured visibility and spatial power spectrum