Improved multiple circular array configuration for sparse aperture optical imaging systems

Abstract. An improved multiple circular array (MCA) configuration is proposed for sparse aperture (SA) optical imaging systems. Using genetic algorithms, the practical cutoff frequency (PCOF), based on the modulation transfer function for the array, is selected as the fitness function. Moreover, the parameters, such as diameters of aperture sets, spacing between the aperture sets, and relative rotation angles between aperture sets on different concentric circles, are calculated. Improved MCA configurations, with aperture numbers of 6, 9, 12, 10, 15, 11, and 13, are given. Golay arrays, MCAs, a single annular aperture, and improved arrays with the same fill factor are compared. The results show that the improved array has highest PCOF of all the SA arrays, smoother coverage in Fourier space, and better midfrequency contrast than MCAs. Consequently, the improved array is a promising aperture configuration that can approximate a single annular aperture.

[1]  D. Marcano,et al.  Synthesis of antenna arrays using genetic algorithms , 1995, Proceedings of First International Caracas Conference on Devices, Circuits and Systems.

[2]  James B. Breckinridge,et al.  Innovative pupil topographies for sparse aperture telescopes and SNR , 2008, Astronomical Telescopes + Instrumentation.

[3]  Nicholas J Miller,et al.  Optical sparse aperture imaging. , 2007, Applied optics.

[4]  Marcel J. E. Golay,et al.  Point Arrays Having Compact, Nonredundant Autocorrelations , 1971 .

[5]  Bradley D Duncan,et al.  Improving mid-frequency contrast in sparse aperture optical imaging systems based upon the Golay-9 array. , 2010, Optics express.

[6]  James E. Harvey,et al.  Performance characteristics of phased array and thinned aperture optical telescopes , 1988 .

[7]  Ruth Moser,et al.  Deployable optical telescope ground demonstration , 2000, Astronomical Telescopes + Instrumentation.

[8]  A B Meinel,et al.  Aperture synthesis using independent telescopes. , 1970, Applied optics.

[9]  Soon-Jo Chung,et al.  Design and implementation of sparse aperture imaging systems , 2002, SPIE Astronomical Telescopes + Instrumentation.

[10]  Quanying Wu,et al.  Configuration optimization of a kind of sparse-aperture system , 2005, International Commission for Optics.

[11]  Li Liu,et al.  Novel array configuration and its optimization for sparse aperture imaging systems , 2011 .

[12]  John R. Schott,et al.  Laboratory validation of a sparse aperture image quality model , 2015, SPIE Optical Engineering + Applications.

[13]  Philip S Salvaggio,et al.  Genetic apertures: an improved sparse aperture design framework. , 2016, Applied optics.