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2007 5th International Conference on Microwave and Millimeter Wave Technology(ICMMT’2007)

作者： YUE Hongwei WANG Jiegui LUO Jingqing Electronic Engineering Institute Hefei 230037.P.R.China

Adaptive nulling methods with multiple constraints for transmitting Digital Beamforming （DBF） of Uniform Linear Arrays （ULA） are proposed in the following three circs,with main lobe constraint only,with main and side lobes constraints,with main and side lobes constraints and given nulls *** the optimum weight vector of transmitting DBF is derived by Lagrange multiplier approach and calculated with sample matrix inversion *** computer simulations show that the proposed methods are practicable and effective.

关键词： Transmitting DBF adaptive nulling

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Focal plane wave-front sensing algorithm for high-contrast imaging

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1284-1288页

作者： DOU JiangPei1,2,3,REN DeQing1,2,4,ZHU YongTian1,2 & ZHANG Xi1,2,3 1 National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology,Chinese Academy of Sciences,Nanjing 210042,China 2 Key Laboratory of Astronomical Optics & Technology,Nanjing Institute of Astronomical Optics & Technology,Chinese Academy of Sciences,Nanjing 210042,China 3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 4 Physics & Astronomy Department,California State University Northridge,18111 Nordhoff Street,Northridge,California 91330-8268,USA National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing China Key Laboratory of Astronomical Optics & Technology Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing China Graduate University of Chinese Academy of Sciences Beijing China Physics & Astronomy Department California State University Northridge Northridge USA

High-contrast imaging provided by a coronagraph is critical for the direction imaging of the Earth-like planet orbiting its bright parent star.A major limitation for such direct imaging is the speckle noise that is induced from the wave-front error of an optical *** derive an algorithm for the wave-front measurement directly from 3 focal plane *** 3 images are achieved through a deformable mirror to provide specific phases for the optics *** introduce an extra amplitude modulation on one deformable mirror configuration to create an uncorrelated wave-front,which is a critical procedure for wave-front *** simulation shows that the reconstructed wave-front is consistent with the original wave-front theoretically,which indicates that such an algorithm is a promising technique for the wave-front measurement for the high-contrast imaging.

关键词： high-contrast imaging multi-image algorithm speckle nulling technique wave-front sensing

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