Selection method for key dynamic modes of spatial mesh antenna based on electrical performance

Abstract

The invention discloses an electric performance-oriented space mesh antenna key dynamical modal selection method. The method comprises the following steps of: inputting geometric parameters, material parameters, electric parameters of modal guillotine factors; calculating an ideal antenna far electric field; establishing an antenna structure finite element model; extracting node, unit and shape function information; calculating a unit electric performance first-order coefficient matrix; grouping an overall electric performance first-order coefficient matrix; carrying out antenna structure modal analysis; outputting a modal matrix; calculating a first-order sensitivity, for the modal, of the electric performance; outputting a modal shape equivalent mass fraction; calculating significance factors, for the modal, of the electric performance; judging whether the significance factors are greater than the modal guillotine factors or not; if the judging result is positive, selecting the significance factors; and otherwise, abandoning the significance factors. According to the method disclosed by the invention, the deficiencies of the traditional dynamical modal selection method are overcome, the influences, on the electric performance of antennas, of modals in different orders are integrally considered in the modal selection process, and the problem of electric performance-oriented space mesh antenna key dynamical modal selection is solved.

Description

technical field [0001] The invention belongs to the technical field of radar antennas, and in particular relates to a method for selecting a key dynamic mode of an electrical performance-oriented space mesh antenna in the field of radar antennas. Background technique [0002] Mesh antennas are gradually used in space antenna design due to their advantages of light weight and small folded volume. During the operation of the mesh antenna in orbit, it is periodically affected by dynamic loads such as space radiation heat and impact. The deformation of the antenna surface caused by the dynamic load will cause the vibration of the antenna structure, the decrease of the electrical performance gain, the increase of the side lobe level, and the tilt of the beam, which will seriously affect the working performance of the antenna. In order to analyze the influence of dynamic load on the electrical performance of the mesh antenna, it is necessary to establish a dynamic model of the an...

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Problems solved by technology

Therefore, aiming at the problem of dynamic key mode selection of spatial mesh antenna, a key dynamic mode selection method oriented to electrical performance is proposed, which overcomes the shortcomings of traditional dynamic mode selection methods and realizes the key dynamic mode selection method in the mode selection process. In the process, the influence of each order mode on the electrical performance of the antenna is fully considered, and the problem of selecting the key dynamic mode of the space mesh antenna oriented to electrical performance is solved.

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