Electric property prediction method of cylinder conformal array antenna under load distortion

Abstract

The invention discloses an electric property prediction method of a cylinder conformal array antenna under load distortion. The method comprises following steps of determining structure parameters and electromagnetic parameters of the cylinder conformal array antenna; carrying out structure load distortion analysis; calculating new positions of array elements after distortion; building an array element rectangular coordinate system and an array element sphere coordinate system, and a conversion matrix between the two coordinate systems; solving an array element directional diagram under the array element rectangular coordinate system; determining a conversion matrix between the array element rectangular coordinate system and an array rectangular coordinate system; solving an array element directional diagram under the array rectangular coordinate system; determining array element execution amplitudes and phases; calculating the space phase difference of each array element; calculating a far region field intensity distribution directional diagram; building an electromechanical coupling model; calculating the electric property parameter of the antenna; and judging whether the calculated electric property parameter satisfies a demand or not. The method can be used for quantitatively evaluating the influence of antenna structure distortion on the electric property of the cylinder conformal array antenna under a load environment, thus instructing the structure design of the cylinder conformal array antenna.

Description

technical field [0001] The invention belongs to the technical field of radar antennas, in particular to a method for predicting the electrical performance of a cylindrical conformal array antenna under load deformation. The invention can be used to evaluate the influence of the positional deviation of the antenna unit caused by the deformation under the load environment on the electrical performance of the cylindrical conformal array antenna, and guide the structural design and optimization of the cylindrical conformal array antenna. Background technique [0002] The conformal array antenna is an antenna that is consistent with the shape of the object. It has the advantages of saving the structural space of the carrier, not affecting the aerodynamic performance of the carrier, and reducing the scattering cross-sectional area of ​​the radar. It has been widely used in the aerospace field. Among them, the cylindrical conformal array antenna is the most common form of conformal...

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Problems solved by technology

However, when using the high-frequency approximation method to solve the problem, it is necessary to calculate the crawling diffraction wave on the curved surface. For this reason, the trajectory of the diffraction line must be determined first. The calculation of the formula is complicated, and the curved surface must be smooth and electrically large. When the number of antenna elements is too large, use With this algorithm, it is difficult to solve the radiation performance of the conformal array antenna

(2) Actual measurement, such as a mathematical model of a conformal linear array proposed in SchippersH, VanTongerenJH, KnottP, etal. Although this method can calculate the impact of the load environment on the electrical performance of the conformal array antenna, its analysis objectives are limited and the process is complicated, so it is not easy to achieve

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