A synthesis imaging technique essentially equivalent to self-calibration, except it explicitly uses the phase closure and amplitude closure relations, rather than the antenna/IF gains. For n antennas, there are amplitudes and phases. There are a total of triangles, but only non-redundant ones. The technique starts with a model of phases, then computes the rest using phase closure relationships. A map is then made, which is inverse Fourier transformed back, and the phase closure relationships used again on the new model. This process is repeated until it converges.
Amplitude Closure Relations, Phase Closure Relations
