Analysing transit telescopes with the m-mode formalism

Among the next generation of radio interferometers are a class of transit telescopes such as the Canadian Hydrogen Intensity Mapping Experiment (CHIME) which are designed for surveying cosmological 21 cm emission. Analysing the data from these instruments is challenging: they are instantaneously very wide-field, map most of the observable sky every day, and require the removal of foregrounds many orders of magnitude brighter than the 21 cm signal.