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| 1 | Imaging algorithm for synthetic aperture interferometric radiometer in near field显示文摘With the benefits of digital IC technology development, the synthetic aperture interferometric radiometer (SAIR) technique is growing fast and expanding to more and more application areas. The near field imaging detection is a potential application which has received increasing demand recently. Because the Fourier imaging theory of the traditional SAIR is based on far-field approximation, it will be invalid for near-field condition. This paper is devoted to establishing a new accurate imaging algorithm for near-field SAIR imaging. Firstly, the visibility function in near field is deduced and the relationship of which to far-field visibility function is analyzed. Then, a numerical method based on pseudo inverse and focal plane approximation is developed. The effectivity of this method is tested with imaging simulation of point source and extended source, and the superiority is also demonstrated by comparing with the existing phase-modified Fourier transform method. At last, the field experiment with one-dimensional SAIR instrument is performed to validate the practical feasibility of this method. | ZHANG Cheng WU Ji LIU Hao YAN JingYe | 2011 | Science China(Technological Sciences)2011，54，8： | 4 |
| 2 | Construction Progress of Chinese Meridian Project PhaseⅡ显示文摘The Chinese Meridian Project(CMP)is the Space Environment Ground Based Comprehensive Monitoring Network of China,a national major science and technology infrastructure project.The CMP consists of the Space Environment Monitoring System,Data Communication System,and Science Application System.Its construction has been divided into two steps:the PhaseⅠwas from 2008 to 2012;the PhaseⅡstarted at the end of 2019,expected to be completed at the end of 2023.Beyond 2023,the CMP as a whole will be in operation to make observations.This report introduces the construction progress of CMP PhaseⅡin the past two years,covering the construction progress of both the Data Communication System and the Science Application System.As for the Space Environment Monitoring System,this report mainly gives an introduction to the construction progress of large-scale advanced monitoring equipment,such as,the solar radio telescope,interplanetary scintillation telescope,incoherent scatter radar,high frequency radar,MST radar,and large-aperture Helium Lidar.In addition,this paper presents the construction plan for the next two years and the future outlook as well. | WANG Chi XU Jiyao LÜDaren YUE Xinan XUE Xianghui CHEN Gang YAN Jingye YAN Yihua LAN Ailan WANG Jiangyan WANG Xin TIAN Yufang | 2022 | 空间科学学报2022，42，4： | 1 |
| 3 | CHD5, a tumor suppressor that is epigenetically silenced in lung cancer显示文摘 | Rui Zhao Qitao Yan Jingye Lv Haili Huang Wenling Zheng Bao Zhang Wenli Ma | 2011 | Lung Cancer2011，，： | 1 |
| 4 | High-speed 2D beam steering based on a thin-film lithium niobate optical phased array with a large field of view显示文摘An on-chip optical phased array (OPA) is considered as a promising solution for next generation solid-state beam steering.However,most of the reported OPAs suffer from low operating bandwidths,making them limited in many applications.We propose and demonstrate a high-speed 2D scanning OPA based on thin-film lithium niobate phase modulators with traveling-wave electrodes.The measured modulation bandwidth is up to 2.5 GHz.Moreover,an aperiodic array combined with a slab grating antenna is also used to suppress the grating lobes of far-field beams,which enables a large field of view (FOV) as well as small beam width.A 16-channel OPA demonstrates an FOV of 50°×8.6°and a beam width of 0.73°×2.8°in the phase tuning direction and the wavelength scanning direction,respectively. | WENLEI LI XU ZHAO JIANGHAO HE HAO YAN BINGCHENG PAN ZICHEN GUO XIANG’E HAN JINGYE CHEN DAOXIN DAI YAOCHENG SHI | 2023 | Photonics Research2023，11，11： | 0 |
| 5 | A Novel Imaging Method Based on Reweighted Total Variation for an Interferometer Array on Lunar Orbit显示文摘Ground-based radio observations below 30 MHz are susceptible to the ionosphere of the Earth and the radio frequency interference.Compared with other space mission concepts,making low frequency observations using an interferometer array on lunar orbit is one of the most feasible ones due to a number of technical and economic advantages.Different from traditional interferometer arrays,the interferometer array on lunar orbit faces some complications such as the three-dimensional distribution of baselines and the changing sky blockage by the Moon.Although the brute-force method based on the linear mapping relationship between the visibilities and the sky temperature can produce satisfactory results in general,there are still large residual errors on account of the loss of the edge information.To obtain the full-sky maps with higher accuracy,in this paper we propose a novel imaging method based on reweighted total variation(RTV)for a lunar orbit interferometer array.Meanwhile,a split Bregman iteration method is introduced to optimize the proposed RTV model so as to decrease the computation time.The simulation results show that,compared with the traditional brute-force method,the RTV regularization method can effectively reduce the reconstruction errors and obtain more accurate sky maps,which proves the effectiveness of the proposed method. | Xiaocheng Yang Mengna Wang Lin Wu Jingye Yan Junbao Zheng Li Deng | 2023 | Research in Astronomy and Astrophysics2023，23，12： | 0 |
| 6 | Estimation of Solar Observations with the Five-hundred-meter Aperture Spherical Radio Telescope(FAST)显示文摘We present the estimation of solar observation with the Five-hundred-meter Aperture Spherical radio Telescope(FAST).For both the quiet Sun and the Sun with radio bursts,when pointing directly to the Sun,the total power received by FAST would be out of the safe operational range of the signal chain,even resulting in damage to the receiver.As a conclusion,the Sun should be kept at least~2°away from the main beam during observations at~1.25 GHz.The separation for lower frequency should be larger.For simplicity,the angular separation between the FAST beam and the Sun is suggested to be~5°for observations at 200 MHz or higher bands. | Lei Qian Zhichen Pan Hongfei Liu Hengqian Gan Jinglong Yu Lei Zhao Jiguang Lu Cun Sun Jingye Yan Peng Jiang | 2023 | Research in Astronomy and Astrophysics2023，23，1： | 0 |
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