Subjects: Astronomy >> Astrophysical processes submitted time 2022-11-17 Cooperative journals: 《天文研究与技术》
Abstract： Shadowing effects is one of the main consideration factors in designing complex system with multiple antennas. There will be 373 sets of antennas in Mingantu Station, after completing the construction of the program Meridian II equipment of National Major Science and Technology Infrastructure. Limited by test site, model complexity and computation, shadowing effect is usually hard to measure and to predict especially for electrically large-size structures. The observed solar radio data on S/C/X bands between 2017 and 2020 by MST (Mingantu Solar Radio Telescope), present the shadowing effect with the 20m antenna and remote hills as obstacles. The observed data with shadowing effect can be divided into antenna area, atmosphere area and hills area with different shadowing characteristics. Based on the prediction method of single knife-edge diffraction loss recommended by ITU-R P.526-15, a model of 20m antenna reflector is built, the shadowing effects on S/C/X-bands are simulated, and the results show agreement with those of observation. From simulation and observing results, shadowing effects are related with wavelength, obstacle character, distance and angle among obstacle, source and receiving antenna, the receiving antenna’s beam, and dynamic range of receiving system, etc.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract：对于拟建设的子午工程二期中的明安图行星际闪烁望远镜，数字波束合成技术是其中的一项关键技术。针对现有数字波束合成算法无法满足IPS望远镜上的应用需求和复杂度较高，本文对现有的数字波束合成算法进行了改进和优化，提出了一种适应于明安图IPS望远镜的波束合成算法，仿真结果显示该算法能够很好地满足IPS望远镜的需求。同时，在单个波束的基础上，本文也提出了多波束合成的算法，并进行了算法的仿真。
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