两种通用直升机雷达散射特性计算与分析

建立了两种通用直升机几何外形模型,采用物理光学法和等效电磁流法进行雷达散射特性计算分析.结果表明,两种通用直升机雷达散射水平较高,头向/尾向及侧向RCS分别达到数十和数百平方米;大曲率半径曲面机身比倾斜平面式机身散射强;可收放式起落架可以改善雷达隐身性能.本文结果对开展通用直升机雷达隐身设计研究具有重要的参考价值.

Calculation and Analysis on Radar Scattering Characteristics of Two Types of Utility Helicopter

Geometry model of two types of utility helicopter were established. By means of the physical optic (PO) and the equivalent currents methods (ECM), the RCS of the utility helicopters was calculated and analyzed. Calculations gave some results. The average RCS of the two utility helicopters in head/tail direction and in fuselage side direction reaches dozens of square meters and hundreds of square meters respectively. For the RCS of helicopter fuselage, the one which has the surface of large curvature radius is larger than the one which has inclined plane. The usage of retractable landing gears can improve the helicopter stealth performance. These results may help the stealth design of utility helicopter.