Rapid prediction and verification of radar cross section for weak-scattering slots in aircraft skin design
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摘要: 在隐身飞行器设计中，缝隙等弱散射源的影响日益凸显。当前研究虽广泛采用仿真与测试分析缝隙散射，但其模型通常不属于真实的弱散射源。为准确度量弱缝隙的雷达散射截面（RCS）性能，本文应用电场矢量叠加原理，采用对消技术将缝隙的散射效应从其低散射背景载体中分离出来。基于此方法，我们明确了缝隙尺寸与其RCS之间的变化关系。同时，本文所采用的多目标散射源累积快速预测方法，能够对单直缝、直缝阵列及弯折缝等目标的散射性能进行快速评估。经对比验证，该快速方法的结果与精确模型仿真具有一致性。此方法为飞机表面蒙皮搭接、设备开口等结构的设计与优化提供了有效工具。文末通过试验件的仿真与实测数据对比，证实了本方法在评估弱散射目标方面的有效性。Abstract:
Background Slots are critical weak scattering sources in stealth aircraft design, significantly influencing Radar Cross Section (RCS). Existing simulation and measurement models often fail to capture true weak scattering behavior, as it is difficult to isolate slot scattering from the low-RCS background.Purpose This study aims to accurately quantify the RCS contribution of weak slots by separating their scattering effect from the background structure, establish relationships between slot dimensions and RCS, and develop a fast estimation method for various slot configurations.Methods Using the electric field vector superposition principle, a cancellation technique was applied to extract slot scattering from the background. A fast multi-target scatterer accumulation method was developed to predict scattering from single straight slots, arrays, and bent slots. Simulations and experiments were conducted for validation.Results The cancellation technique effectively isolated slot scattering, revealing clear RCS-dimension correlations. The fast estimation method agreed well with detailed simulations and experimental measurements across different slot types.Conclusions The proposed approach offers an effective tool for designing and optimizing aircraft structures such as skin joints and apertures. It enables efficient RCS evaluation of weak scattering sources, enhancing stealth performance assessment capability. -
图 5 不同缝隙宽度和深度的缝隙RCS均值曲线
Figure 5. The average RCS curve of gaps with different widths and depths
表 1 不同长度的缝隙RCS对比
Table 1. RCS comparison of slots with different lengths
slot length/mm mean RCS of
slot (±30°)/dBsmpeak RCS of
slot (0°)/dBsm20 −70.72 −68.74 30 −68.59 −64.96 40 −67.35 −62.67 60 −65.58 −59.17 80 −64.20 −56.55 120 −62.43 −53.06 
下载: 导出CSV
表 2 不同长度的缝隙RCS对比
Table 2. RCS comparison of slots with different lengths
slot length/
mmmean RCS of Slot (±30°)/dBsm peak RCS of slot (0°)/dBsm simulated value estimated value simulated value estimated value 50 −54.73 / −49.17 / 100 −51.51 −51.66 −43.03 −43.19 200 −48.20 −48.63 −36.70 −37.24 400 −45.05 −45.63 −30.54 −31.22
下载: 导出CSV
表 3 不同类型的缝隙RCS对比
Table 3. RCS comparison of slots with different types
type of slot simulation results/dBsm rapid assessment/dBsm straight slot −45.05 −45.63 sharp-tipped slot −66.71 −65.34 double-tapered slot −65.20 −64.97
下载: 导出CSV
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