An investigation was made of the effects of dilution on a six-element synthetic aperture. The characteristics of both the spread function and the transfer function were obtained for several degrees of dilution. It is shown that small degrees of dilution result in a significant gain over the performance of a single element, whereas more dilute apertures are inferior for direct imagery.
R. V. Shack, J. D. Rancourt, and H. Morrow, "Effects of Dilution on a Six-Element Synthetic Aperture," Appl. Opt. 10, 257-259 (1971)