A Novel Two-dimensional Low-redundancy Array Design for Solar Radio Imaging  

作　　者：Weidan Zhang Bing Wang Zhao Wu Guang Lu Yao Chen Yan Fabao 张卫丹;王冰;武昭;路光;陈耀;严发宝(Laboratory for Electromagnetic Detection,Institute of Space Sciences,Shandong University,Weihai 264209,China;Center for Integrated Research on Space Science,Astronomy,and Physics,Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao 266237,China;School of Mechanical,Electrical&Information Engineering,Shandong University,Weihai 264209,China)

机构地区：[1]Laboratory for Electromagnetic Detection,Institute of Space Sciences,Shandong University,Weihai 264209,China [2]Center for Integrated Research on Space Science,Astronomy,and Physics,Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao 266237,China [3]School of Mechanical,Electrical&Information Engineering,Shandong University,Weihai 264209,China

出　　处：《Research in Astronomy and Astrophysics》2024年第9期178-189,共12页天文和天体物理学研究（英文版）

基　　金：supported by the grants of the National Natural Science Foundation of China(42127804,42374219)。

摘　　要：The radioheliograph is an extensive array of antennas operating on the principle of aperture synthesis to produce images of the Sun.The image acquired by the telescope results from convoluting the Sun’s true brightness distribution with the antenna array’s directional pattern.The imaging quality of the radioheliograph is affected by a multitude of factors,with the performance of the“dirty beam”being simply one component.Other factors such as imaging methods,calibration techniques,clean algorithms,and more also play a significant influence on the resulting image quality.As the layout of the antenna array directly affects the performance of the dirty beam,the design of an appropriate antenna configuration is critical to improving the imaging quality of the radioheliograph.Based on the actual needs of observing the Sun,this work optimized the antenna array design and proposed a twodimensional low-redundancy array.The proposed array was compared with common T-shaped arrays,Y-shaped arrays,uniformly spaced circular arrays,and three-arm spiral arrays.Through simulations and experiments,their performance in terms of sampling point numbers,UV coverage area,beam-half width,sidelobe level,and performance in the absence of antennas are compared and analyzed.It was found that each of these arrays has its advantages,but the two-dimensional low-redundancy array proposed in this paper performs best in overall evaluation.It has the shortest imaging calculation time among the array types and is highly robust when antennas are missing,making it the most suitable choice.

关 键 词：INTERFEROMETERS methods:observational techniques:interferometric 

分 类 号：P111.41[天文地球—天文学]