Purpose

This study aims to learn the dynamic radar cross-section (RCS) of a deflection air brake.

Design/methodology/approach

The aircraft model with delta wing, V-shaped tail and blended wing body is designed, and high-precision unstructured grid technology is used to deal with the surface of air brake and fuselage. The calculation method based on multiple tracking and dynamic scattering is presented to calculate RCS.

Findings

The fuselage has a low scattering level, and the opening air brake will bring obvious dynamic RCS effects to itself and the whole machine. The average indicator of air brake RCS can be lower than –0.6 dBm² under the tail azimuth, while that of forward and lateral direction is lower. The mean RCS of fuselage is obviously higher than that of air brake, while the deflected air brake and its cabin can still provide strong scattering sources at some azimuths. When the air brake is opening, the change amplitude of the aircraft forward RCS can exceed 19.81 dBm².

Practical implications

This research has practical significance for the dynamic electromagnetic scattering analysis and stealth design of the air brake.

Originality/value

The calculation method for aircraft RCS considering air brake dynamic deflection has been established.

中文翻译：

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观察隐身飞机空气制动器上的电磁散射特性

目的

本研究旨在了解偏转空气制动器的动态雷达截面（RCS）。

设计/方法论/途径

设计了三角翼、V型尾翼、翼身融合的飞机模型，采用高精度非结构化网格技术对气闸和机身表面进行处理。提出了基于多重跟踪和动态散射的RCS计算方法。

发现

机身散射程度较低，开启气刹会给自身及整机带来明显的动态RCS效果。尾部方位角下气闸RCS平均指标可低于–0.6 dBm ²，而前向和侧向则更低。机身平均RCS明显高于气闸，而偏转气闸及其机舱在某些方位仍能提供强散射源。当气闸打开时，飞机前向RCS的变化幅度可超过19.81 dBm ²。

实际影响

该研究对于空气制动器的动态电磁散射分析和隐身设计具有实际意义。

原创性/价值

建立了考虑气制动动偏转的飞机RCS计算方法。