Full-polarization bistatic scattering characteristics analysis of stealth aircraft

Bistatic radar is a hot research topic in recent years, especially about passive bistatic radar and bistatic SAR, however, the polarimetric bistatic scattering characteristics of the target is not researched enough, which limits the detection and recognition capability of the bistatic radar. The whole spatial polarimetric bistatic scattering data of the full-size stealth aircraft model are calculated with the multi-level fast multipole algorithm (MLFMA) via the electromagnetic calculation software. The fluctuation characteristic statistic of the polarimetric bistatic radar cross section (RCS) is carried out, and it is found that the statistical properties of the four kinds of polarimetric bistatic RCS are nearly the same, while the monostatic main and cross polarization RCS statistical properties are quite different from each other as shown in Fig. 1. It is also found that dynamic ranges of the four polarimetric types of bistatic RCS is larger than the monostatic case and the mean values of the four polarimetric types of bistatic RCS are larger than the monostatic case. The distribution characteristics statistic of the monostatic and bistatic polarization ratio is carried out and it is found that the monostatic and bistatic cross-main polarization ratios are quite different, while the main polarization ratios are similar. So any type of polarization is suitable for the bistatic radar while only the main polarization for monostatic radar. What is more, the full polarimetric capability is strongly recommended for bistatic radar. All the statistic results also provide a theory reference for fully polarimetric bistatic radar stealth aircraft target detection experiments.