Quick analysis method of electric performance of conformal load-bearing array antenna under dynamic load

Abstract

The invention relates to a quick analysis method of the electric performance of a conformal load-bearing array antenna under a dynamic load. The quick analysis method comprises the following steps of: (1) establishing a structural finite element model; (2) extracting the central position coordinate rn of an array antenna unit; (3) loading a position constraint to the finite element model, and extracting each-order frequency [Omega]i and a mode-of-vibration vector after modal analysis is carried out; (4) expressing the dynamic structure deformation of an antenna array as [Delta]r([Beta], t)=Pq(t); (5) extracting the central position offset amount of the antenna unit; (6) substituting the central position coordinate rn of the antenna unit and the central position offset amount [Delta]rn([Beta, t]) of the antenna unit into the far-field pattern computational formula of the conformal load-bearing array antenna, and obtaining a relational expression which expresses the influence of the structure deformation on the far-field pattern of the antenna under the dynamic load; and (7) carrying out taylor expansion on an exponential term exp(jk.[Delta rn]([Beta, t])) in the relational expression, taking first three orders, and writing the far-field pattern of the antenna into a form of the linear combination of the structure relevant item and the load relevant item of the antenna.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a method for quickly analyzing the electrical performance of a conformal bearing array antenna under dynamic loads. Background technique [0002] The conformal load-bearing array antenna refers to the use of an integrated composite molding process to embed a low-profile antenna array into the skin structure of various weapons and equipment to form a highly integrated smart skin antenna. The smart antenna has both mechanical bearing capacity and electromagnetic radiation capability. It is one of the indispensable key components in future weapons and equipment such as unmanned aerial vehicles, high-altitude airships, and new-generation early warning aircraft. [0003] Compared with the traditional array antenna, the conformal load-carrying array antenna has the advantages of load-carrying capacity, high integration, small space inside the equipment, good stealth perfor...

AI Technical Summary

Problems solved by technology

However, when the service load of the antenna changes, it is necessary to re-analyze the structure, and then introduce the structural deformation information at different times into the calculation formula of the far-field pattern of the array antenna to obtain the corresponding electrical performance of the antenna, which will inevitably lead to calculation less efficient

Due to the time-consuming structural analysis, the results of electrical performance analysis will also lag behind, and the existing analysis methods are not conducive to realizing real-time compensation of electrical performance after antenna structure deformation

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