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Stefan J. Wijnholds, "Effective Noise", SKA Calibration & Imaging Workshop, Perth (Australia), 7-9 April 2008 abstract: Dynamic range is commonly defined as the flux ratio between the strongest and the weakest believable features in the map. This figure of merit depends strongly on the flux of the brightest source in the field, making this concept depend heavily on the field of interest. The concept of effective noise, which is a combination of propagated calibration errors, thermal noise and source confusion, provides a more target field independent figure of merit. In this presentation I will indicate how effective noise may be calculated in a rigorous quantitative sense including both (u,v)-plane as well asa image plane effects, but also provide some useful engineering approximations. |