极化捷变末制导雷达抗机载箔条质心干扰研究

Research on Centroid Anti-jamming of Polarization Agility Terminal-guided Radar at Airborne Chaff

机载箔条弹的质心干扰对末制导雷达的跟踪与制导构成了严重的威胁。针对时频域抗质心干扰效果不佳的问题提出了一种在极化域抗质心干扰的仿真模型,并将仿真结果进行了分析。该模型重点构建了箔条云的RCS极化散射模型和波束对云团的动态切割模型,在简化其它子模型的条件下,给出了仿真结果,研究了极化抗质心干扰成功所满足的输入条件。仿真结果表明,在雷达低视角、箔条偶极子小俯仰角分布方差的条件下增大入射极化倾角时,质心向载机方向快速移动,能够达到抗质心干扰的目的,间接证明了所建模型的正确性和极化抗质心干扰方法的可行性。

Airborne chaff centroid anti-jamming is a severe threat to track and guide of Terminal-guided Radar. Aiming at the problem of poor effect for centroid anti-jamming in time domain and frequency domain, a new simulation model for centroid anti-jamming in polarization domain was proposed, and the simulation results were deeply analyzed. The model focused on constructing polarization scattering model of RCS of chaff and dynamic sliced model for wave beam to chaff clouds, and simulation results were given to study the necessary and sufficient conditions to successful polarization agility anti-jamming under condition of simplifying other submodel. Simulation results show that the centroid gradually moves to the direction of fly when incident polarized angle is increasing in conditions of low radar sight angle and small variance of angle of pitch distribution of dipole, aim of chaff centroid anti-jamming is achieved, indirectly proving validity of the constructed model and feasibility of the ways of centroid anti-jamming in polarization domain.