Electromagnetic scattering characteristics of coaxial helicopter based on dynamic transformation method

• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（2）
• 页码范围: 516-528
• 页数: 13页
• 语种: 英文

摘要

With the development of coaxial rotors and high-speed helicopters, the electromagnetic scattering characteristics of coaxial helicopters have gradually become a research hotspot. In order to deal with the Radar Cross-Section (RCS) of high-speed rotating rotors or coaxial main rotors, a Dynamic Scattering Method (DSM) based on dynamic process simulation and grid coordinate transformation is presented. Instantaneous electromagnetic scattering from rotors and helicopters is solved using Physical Optics (PO) and Physical Theory of Diffraction (PTD). Important factors are analyzed and discussed in detail, including individual rotor rotation, azimuth, elevation angle, fuselage, pitch angle, and roll angle. The results show that the electromagnetic scattering character-istics of rotor-type components are dynamic and periodic. The dynamic RCS period of a single rotor is related to the dynamic RCS period of the coaxial main rotor. Choosing different observa-tion angles and attitude angles has a great impact on the static and dynamic RCS of the helicopter. The presented DSM is effective and efficient to analyze and determine the dynamic electromagnetic scattering characteristics of conventional helicopters or coaxial helicopters.