直升机翼面类部件雷达目标特性分析及评估

基于准静态原理，采用电磁高频法开展直升机翼面类部件的雷达目标特性分析及评估.首先，为获得翼面类部件对直升机散射特性的影响规律，并考虑旋翼高速旋转的动态效应，着重分析了装配不同翼面类部件后机身雷达散射截面（RCS）的变化趋势、强散射分布和回波信号的时频域谱特征，揭示了翼面类部件雷达散射影响机理；然后，在评估直升机强散射源分布特征和多元响应特性的基础上，比较装配不同翼面类部件后机身的雷达探测距离，提出并建立了方位、俯仰与滚转姿态下直升机的雷达4级预警机制和角域范围，并针对性的给出对抗雷达探测的方案.研究发现:装配平尾、短翼及平尾和短翼组合的直升机相比孤立机身的雷达暴露距离分别增加11.54%，14.88%和18.06%，综合隐身能力下降. 

Analysis and evaluation about radar target scattering characteristics of helicopter wing components

Considering quasi-stationary principle, analysis and evaluation about helicopter wing components on the radar scattering characteristics were investigated based on electromagnetic high-frequency method. Firstly, in order to obtain effects about the radar scattering characteristics of the helicopter wing components, the RCS(radar cross section) changes, the strong scattering regions, and the time-frequency domain of echo signal were analyzed considering the dynamic features of rotor high-speed rotation; as a result, the scattering mechanisms of wing components were revealed. Then, according to the strong scattering distributions and multiple response characteristics of the helicopter, the radar detection range of the helicopter with different wing components was compared, four levels warning mechanism and angle domains about azimuthal, pitch and roll attitudes were proposed, and the corresponding strategy against the radar detection was given. It shows that the radar exposure distance of helicopter fuselage with difference wing components such as the horizontal stabilator, wingstub and their combinations, increase by 11.54%, 14.88% and 18.06%, respectively, and comprehensive radar stealth performances of the helicopter are declined.