Scattering characteristics of cavity-like targets based on carrier-to-cancellation method
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摘要:
进气道等腔体类目标散射是隐身飞行器散射的重要组成部分，已有的腔体类目标散射研究并未给出装机后腔体类目标散射特性的结果。将载体对消技术应用于腔体模型的电磁散射计算中，可有效消除腔体外表面散射，获得更精确的腔体内部散射特性。构建了封闭口面和填充吸波材料的2种腔体模型，通过腔体模型的点频雷达散射截面（RCS）、一维像和二维像验证了载体对消技术的有效性和准确性。数值计算结果表明，入射电磁波在60°～90°角度范围内，腔体内部散射对腔体总散射的贡献较小，腔体外表面散射贡献较大，在±90°处相差30 dB以上。分析此角度范围的进气道等腔体类目标内部散射时，须有效消除腔体外表面影响。
Abstract:Scattering from cavity-type targets such as air intakes is an important part of scattering from stealth vehicles, and the existing studies on scattering from cavity-type targets do not give results on scattering characteristics of cavity-type targets after installation. By applying the carrier-to-cancellation technique to the electromagnetic scattering calculation of the cavity model, the scattering from the outer surface of the cavity can be effectively eliminated and more accurate scattering characteristics of the inner cavity can be obtained. Two cavity models with closed mouth surface and filled with absorbing materials are constructed, and the effectiveness and accuracy of the carrier-to-cancellation technique are verified by the point-frequency radar cross section (RCS), one-dimensional imaging and two-dimensional imaging of the cavity model. The numerical calculation results show that the contribution of the incident electromagnetic wave to the total scattering of the cavity is smaller for the internal scattering of the cavity in the angle range of 60° to 90°, and the contribution of the scattering from the outer surface of the cavity is larger, with a difference of more than 30 dB at ±90°. When analyzing the internal scattering of cavity-like targets such as air intakes in this angle range, the influence of the outer surface of the cavity must be effectively eliminated.
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图 2 基于载体对消技术的封闭口面腔体模型示意图
Figure 2. Schematic diagram of closed mouth cavity model based on carrier cancellation technology
图 3 工程中填充角锥形吸波材料腔体模型示意图
Figure 3. Schematic diagram of a cavity model filled with angle conical absorbing material in engineering
图 4 基于载体对消技术的填充吸波材料腔体模型示意图
Figure 4. Schematic diagram of cavity model filled with absorbing material based on carrier cancellation technology
图 5 不同频率下封闭腔体与腔体口面盖板载体对消的RCS对比结果
Figure 5. RCS comparison results of closed cavity and cavity surface carrier cancellation at different frequencies
图 6 不同频率下金属腔体与腔体外表面载体对消的RCS对比结果
Figure 6. RCS comparison results between metal cavity and external surface carrier cancellation at different frequencies
图 7 不同频率下填充吸波材料腔体模型载体对消的RCS对比结果
Figure 7. RCS comparison results of carrier cancellation of cavity model filled with absorbing material at different frequencies
图 8 封闭口面腔体模型载体对消的一维像
Figure 8. One dimensional image cancellation of a closed cavity model
图 9 填充吸波材料腔体模型载体对消的一维像
Figure 9. One dimensional image cancellation of cavity model carrier filled with absorbing material
图 10 基于载体对消技术的封闭口面腔体模型的二维成像结果
Figure 10. Two-dimensional imaging results of cavity model with closed mouth based on carrier cancellation technique
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