Method for surface shape reconstruction and directional diagram acquisition of double-reflector antenna

Abstract

The invention discloses a method for reconstructing the surface shape of a double-reflector antenna and acquiring a directional diagram, and belongs to the technical field of antenna measurement. The method comprises the following steps: calculating deformation deviation values of two main reflecting surfaces; based on a 37-order Zernike polynomial, obtaining a Zernike fitting coefficient vector; combining the two groups of coefficient vectors and Zernike polynomials to obtain deformation reconstruction basic data of the main reflecting surface; a Zernike coefficient vector and a Zernike polynomial are used for describing the wavefront optical path difference of the main reflecting surface, and the deformation phase difference and phase influence factors of the two main reflecting surfaces are obtained; calculating a phase influence factor under feed source position deviation and a feed source directional diagram function under feed source angle deviation; and calculating an ideal antenna far-field pattern, a far-field pattern when the two main reflecting surfaces deform, and a far-field pattern under feed source position deviation, and obtaining basic data of a final far-field pattern of the antenna. According to the method, the influence of antenna structure deformation on the electrical performance is comprehensively considered, and the precision of drawing the antenna far-field pattern is improved.

Description

technical field [0001] The invention relates to the technical field of antenna measurement, in particular to a method for reconstructing the surface shape of a double-reflector antenna and obtaining a pattern. Background technique [0002] With the continuous development of radio communication technology, reflector antennas, as the mainstream equipment in the current communication field, are widely used in satellite communication, radar, remote sensing, radio astronomy and other fields in microwave, millimeter wave, and submillimeter wave bands. In recent years, research on astronomical observation and terahertz communication has become very popular. Dual-reflector antennas have many excellent characteristics in the field of large-diameter and high-frequency communication, and dual-reflector antennas have developed rapidly. Beijing Miyun 50-meter radio telescope, Shanghai 65-meter Tianma radio telescope, Guizhou 500-meter radio telescope, and the largest radio astronomy proj...

AI Technical Summary

Problems solved by technology

During the actual working process of the antenna, due to the influence of gravity, temperature, wind load, sunlight and other environmental factors, the accuracy of the main surface, the position of the secondary surface, and the position of the feed horn will be further deteriorated

Finally, it will further affect the electrical performance of the antenna, resulting in the beam shift of the antenna pattern, the widening of the lobe width, the increase of the side lobe level, and the decrease of the gain

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