Automatic Level Control Loop -- from Eric Weisstein's World of Physics

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Optics "> Interference "> Interferometry "> Synthesis Imaging v

Automatic Level Control Loop

To simplify the electronics in a synthesis imaging interferometer, it is convenient to adjust the gain at the correlator so that it remains constant. Since gain , where is the system temperature, special circuits called ALC loops monitor and adjust the gain to achieve this.

Synthesis Imaging

References

D'Addario, L. R. "Cross Correlators." Ch. 4 in Synthesis Imaging in Radio Astronomy: Third NRAO Summer School, 1988 (Ed. R. A. Perley, F. R. Schwab, and A. H. Bridle). San Francisco, CA: Astronomical Society of the Pacific, 1989.