基于CAPS天線的綜合孔徑研究
[Abstract]:The larger the diameter of the antenna of the single antenna radio telescope, the higher the resolution. However, the diameter of the antenna is difficult to make, and the diameter of the maximum movable single antenna is no more than 100 meters. Synthetic aperture can make use of multi-plane small aperture antenna to realize the efficiency of large aperture antenna. This paper introduces the basic principle of synthetic aperture and the composition of the equipment. On the basis of the existing 6-side CAPS antenna, the equipment needed to use the CAPS antenna for the synthetic aperture, the way to realize the synthetic aperture and the technical index for the synthesis of the CAPS antenna are analyzed and discussed. This paper introduces the theory of UV coverage in synthetic aperture imaging, and introduces the influence of UV coverage on the image in synthetic aperture imaging, as well as the criterion for judging the quality of UV coverage. Based on the theory of UV coverage, the principle of optimal array placement for synthetic aperture arrays is discussed. In the linear array, the exhaustive method and simulated annealing algorithm are used to calculate the optimal array arrangement, and the minimum missing arrangement from 4 antennas to 8 antenna baselines is obtained, and the advantages and disadvantages of the two optimization algorithms are compared. In this paper, genetic algorithm is used to design a new evaluation scheme for array optimization design. Compared with the traditional evaluation scheme, the optimal antenna arrangement with 6 antennas and 8 antenna bases is obtained. According to the actual arrangement of CAPS ground station antennas, the sensitivity, resolution and UV coverage of the existing 6 antennas are given. Under the assumption that the position of the antenna can be adjusted, the technical indexes of the six antennas with different arrangement modes are given. For the two-sided new CAPS antenna to be built, the influence of different construction positions on the synthetic aperture is analyzed, and the optimal antenna arrangement is given. Finally, according to the scientific objectives of the observation, the selection schemes of different aperture synthesis methods are given.
【學(xué)位授予單位】:中國科學(xué)院研究生院(國家授時中心)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2010
【分類號】:P111.44
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