文章基本信息

标题：A NEW COMPUTATION METHOD FOR POINTING ACCURACY OF CASSEGRAIN ANTENNA IN SATELLITE COMMUNICATION
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作者：S.V. DEVIKA ; KAILASH KARKI ; SARAT K KOTAMRAJU 等
期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2017
卷号：95
期号：13
页码：3062
出版社：Journal of Theoretical and Applied
摘要：The amount of pointing error (beam squint) plays a decisive role in maintaining high data link for satellite communication. Antenna pointing errors cause a decrease in gain as well as an increase in interference to neighboring satellites. Due to the restricted beam width in high gain antennas, precise pointing is needed. In this paper, the pointing error for 1.5m Cassegrain antenna (ground station antenna) is calculated with respect to its structural displacements (mainly Feed Displacement and Secondary Reflector Translation). Also, the impact of these structural deflections on antenna parameters such as peak gain, phase error, and sidelobe level is evaluated. The result shows that pointing error may rise up to 1.6 degrees for one-inch displacement of structures. Finally, 75% of gain loss is compensated by using movable feed and Subreflector.
关键词：Antenna Pointing; Cassegrain Antenna; Feed Displacement; Lateral Defocus; Axial Defocus; Phase Error.