钝角二面角全极化双基地RCS统计建模

Full polarization bistatic RCS statistical modeling of obtuse dihedral structures

摘要:

钝角二面角结构在目标的隐身特性中发挥着重要作用，但其双基地特性尚不明确。采用电磁仿真与统计建模相结合的方法，从频域、空域、极化域和统计分布角度对其双基地散射特性进行分析。研究表明，在电尺寸较小时，双基地散射增强特性并不明显，单/双基地RCS概率密度分布差异大，共极化的双基地RCS概率密度分布呈现双峰特性，为此提出了双对数正态分布模型，取得了理想拟合效果；在电尺寸较大时，共极化的双基地前向散射特性增强明显，单/双基地RCS概率密度分布相似，符合对数正态分布和卡方分布。所揭示规律对钝角二面角结构的利用具有参考意义。

Abstract:

The obtuse dihedral structure plays an important role in the stealth characteristics of the target, but its bistatic characteristics are still unclear. The method of combining electromagnetic simulation and statistical modeling is utilized to analyze its bistatic scattering characteristics from the perspective of frequency domain, space domain, polarization domain and statistical distribution. Studies have shown that when the electrical size is small, the bistatic scattering enhancement characteristics are not obvious, and the probability density distributions of monostatic/bistatic Radar Cross Section(RCS) are very different; the bistatic RCS probability density distribution of co-polarization exhibits bimodal characteristics. For this reason, the Bimodal Lognormal Distribution Model(BLDM) is proposed. This distribution model has achieved an ideal fitting effect. When the electrical size is large, the co-polarized bistatic forward scattering characteristics are significantly enhanced, and the monostatic/bistatic RCS probability density distributions are similar, which conforms to the lognormal distribution and the chi-square distribution. The law revealed has reference significance for the utilization and detection of obtuse dihedral structures.