Structural dominant mode determination method for active phased array antenna

Abstract

The invention discloses a structural dominant mode determination method for an active phased array antenna. The method comprises the steps that 1, parameters of the active phased array antenna are determined, and a finite element model of the antenna is established; 2, antenna natural frequency and a modal shape are obtained through modal analysis; 3, antenna load-deformation is analyzed; 4, output energy corresponding to antenna structural modes is calculated; 5, the antenna structural modes are truncated according to the energy precision requirement; 6, the proportion of energy corresponding to the truncated modes is obtained; 7, a state space equation corresponding to the truncated modes is established; 8, 2-norms of a transfer function corresponding to the truncated modes are calculated according to parameters of the state space equation of the truncated modes; 9, comprehensive norms of the truncated modes are calculated; 10, the comprehensive norms of the truncated modes are ranked from large to small for selection of a dominant mode, and the structural dominant mode of the active phased array antenna is obtained. The method can guide dynamic modeling and pointing control of the active phased array antenna to guarantee antenna service performance.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, and in particular relates to a method for determining the main mode of a structure oriented to an active phased array antenna. The invention can be used to determine the main mode of the structure of the active phased array antenna, and lay a foundation for the subsequent dynamic modeling and pointing control of the active phased array antenna to ensure the service performance of the antenna. Background technique [0002] Active phased array antenna is a new technology that is developing rapidly in recent years. It has opened up a wider space for the development of radar with technologies such as fast antenna beam scanning, flexible beam shape, and signal power space synthesis. At present, active phased array antennas have been widely used in airborne early warning, spaceborne imaging, ground air defense and other fields, and have become the mainstream of today's radar development. ...

AI Technical Summary

Problems solved by technology

However, for the active phased array antenna, due to its complex structure, the number of nodes and units after discretization is very large, and the corresponding modal components will also become extremely complex. It is one of the problems faced by researchers at home and abroad to establish the main mode of the structure based on scientific modeling and lay the foundation for the subsequent establishment of dynamic models.

[0004] At present, domestic and foreign scholars mainly have two methods when selecting the main mode of the structure: (1) use the 2-norm of the transfer function as the performance index to select the main mode of the structure, such as Gawronski, Modeling and control of antenna and telescope, Springer, 2008. introduced the method of determining the main mode of the structure, which is to use the 2-norm of the transfer function as the performance index, analyze the degree of influence of the mode and its correlation on this index, and select the main mode of the structure accordingly. However, this method does not take into account the proportion of energy corresponding to the mode

(2) Use the energy criterion to select the main mode of the antenna structure, such as Cui Lingli, Zhang Jianyu, Gao Lixin, Xiao Zhiquan, Mode reduction of flexible manipulator based on energy criterion, Journal of System Simulation, 2007, 19(5), In 1011-1014, the energy criterion based on the energy norm was established, and the energy criterion was used as the standard for system modal truncation, and the convergence degree or energy contribution of the energy response information was used as the judgment standard for structural modal truncation. Does not consider the influence of the mode on the output of the system

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