直升机旋翼电磁特性模拟新技术

针对直升机电磁散射特性无源模拟的技术瓶颈，基于直升机桨叶的结构特点和雷达回波特性，提出一种基于小散射源阵列的新型旋翼散射特性增强技术，通过阵列合成公式和数值仿真分析了散射源阵列的雷达散射截面（RCS）的峰值大小、波峰数目、波峰位置、主瓣宽度等特性。同时，将该技术应用于国内某型无人直升机旋翼，设计了原理样机，并在微波暗室里对其电磁特性进行测试。测试结果与理论仿真结果吻合较好，验证了本方案的有效性和可行性，为试验模拟技术提供有力支持。

Novel technology for electromagnetic characteristic simulation of helicopter blades

Aiming at the technical bottleneck of the passive simulation of helicopter electromagnetic scattering characteristics and based on the structure and electromagnetic characteristics of helicopter blades, this paper proposes a novel scattering characteristics augmented technology of blades that is based on small scattering source array. The peak value, the number of peaks, the position of the peaks, and the beamwidth of mainlobe of scattering source array's Radar Cross Section (RCS) are analyzed by array synthesis formula and numerical simulation. Moreover, for the application to the rotor of a domestic unmanned helicopter, a prototype of blade augmenter is designed and tested in a microwave anechoic chamber. The experimental results are in good agreement with the simulation results, verifying the validity and feasibility of the scheme, and greatly supporting the simulation technology.