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| 射电天文望远镜的焦面阵设计 | |
| 引用本文： | 吕善伟,吴东梅,王伟,南仁东.射电天文望远镜的焦面阵设计[J].北京航空航天大学学报,2007,33(3):341-344. |
| 作者姓名： | 吕善伟 吴东梅 王伟 南仁东 |
| 作者单位： | 1. 北京航空航天大学 电子信息工程学院, 北京 100083; 2. 航天科工集团203所, 北京 100854; 3. 中科院国家天文台, 北京 100012 |
| 基金项目： | 国家自然科学基金，国家天文台FAST课题资助项目 |
| 摘 要： | 为使射电天文望远镜的视场得到扩大,分析望远镜的视场时对天线的反射面提出共形网格剖分法,对物理光学法的常规计算方法进行了改进,使计算精度得到提高,且剖分网格少.采用改进的算法计算了WSRT望远镜的焦面场,并根据计算结果设计了WSRT望远镜的致密焦面阵结构;用共轭匹配法对阵列单元加权、计算相应的远场方向图,并与采用单个馈源时的远场方向图作比较.结果表明采用致密焦面阵能扩大视场并保证视场连续,增益也得到提高. |
| 关 键 词： | 天文望远镜 反射面天线 物理光学法 焦面阵 |
| 文章编号： | 1001-5965(2007)03-0341-04 |
| 收稿时间： | 2006-04-04 |
| 修稿时间： | 2006-04-04 |
Design of focal plane array of radio telescope |
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| L Shanwei,WU Dongmei,WANG Wei,NAN Rendong.Design of focal plane array of radio telescope[J].Journal of Beijing University of Aeronautics and Astronautics,2007,33(3):341-344. | |
| Authors: | L Shanwei WU Dongmei WANG Wei NAN Rendong |
| Institution: | 1. School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China; 2. The Second Academy, China Areo-space Science & Industry Corp., Beijing 100854, China; 3. The National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China |
| Abstract: | In order to increase the field of view(FOV) of the radio telescope,a new grid method named the conforming grid was proposed when the FOV of the telescope was analyzed.With this grid,the physics optical(PO) method is more accurate and fewer grids are needed compared to the conventional PO method.With the modified method,the focal field of WSRT telescope was computed.Based on the result,the dense focal plane array was designed for the telescope.The weights of focal plane array were given by the conjugate field method and the far fields of WSRT were computed.It is proven that a wider FOV,higher gain and aberration correction are obtained by dense focal plane array compared to the single feed. |
| Keywords: | telescope reflector antenna physical optics method focal plane array |
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