Gain-oriented large-scale deformed parabolic antenna panel precision adjusting method

Abstract

The invention discloses a gain-oriented large-scale deformed parabolic antenna panel precision adjusting method. The method comprises the following steps: confirming the structure scheme of a parabolic antenna and the initial position of an actuator, building a finite element model of the antenna structure and actuator supporting panel nodes; confirming the deformation error upper bound of the paraboloid; calculating the self-weight deformation of the antenna structure and extracting the node information of the deformed paraboloid; calculating the root-mean-square error of an optimally-matched paraboloid and the deformed paraboloid of the antenna; confirming corresponding nodes of the deformed paraboloid and the optimally-matched paraboloid; calculating the adjustment amount of the actuator; adjusting the panel position and updating the finite element model of the antenna structure; and confirming the deformation error upper bound of the paraboloid according to the antenna gain requirement, judging whether the error is in an allowable range or not and obtaining the adjustment amount with optimal precision. By means of the method disclosed by the invention, the gain-oriented adjustment amount of the actuator can be directly calculated; the actuator total travel is shortest and the real-time performance is good; both the antenna surface precision and the aperture efficiency are highest; and therefore, the electrical property deterioration problem caused by the self-weight deformation of the antenna is solved.

Description

technical field [0001] The invention belongs to the technical field of antennas, and specifically relates to a gain-oriented large-scale deformed parabolic antenna panel precision adjustment method, which is used to actively adjust the position of the reflective surface panel of the large-scale deformed parabolic antenna, so as to optimize the antenna gain and surface-to-face efficiency. Background technique [0002] Faced with the development trend of large-aperture radio telescopes and high-frequency bands, large-scale antennas serving in complex environments will undergo structural deformation under the influence of factors such as self-weight, temperature, and wind load, and the antennas will rotate in pitch and azimuth during service. , installation and other random errors, they together lead to the deformation of the antenna structure, which causes the decrease of the surface precision of the antenna, and deteriorates the efficiency and gain of the antenna surface. At ...

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Problems solved by technology

Among the existing patents related to large-scale antenna electrical performance compensation, for example, the patent application number of the Key Laboratory of Electronic Equipment Structure Design of the Ministry of Education of Xidian University is 201510114942. Secondary Surface Compensation Method for Double-Reflector Antenna", and the patent application number is 201510548132.2, and the title of the invention is "A Direction Adjustment Method for Large Shaped Double-Reflector Antenna Based on Electromechanical Coupling", which are all based on the traditional antenna structure , adjust the antenna pointing by matching the sub-surface to the best position and adjusting the overall azimuth and pitch rotation of the antenna respectively. However, the antenna profile still has deformation, which cannot make up for the problems of antenna gain loss and low surface-to-surface efficiency. In practical applications It is difficult to meet the working performance compensation of large antennas

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