Experimental and Numerical Studies on Scattering from Multiple Propellers of Small UAVs

Abstract

Electromagnetic scattering from propellers of smallsized Unmanned Aerial Vehicles (UAVs) is studied in this work. Previous works have shown that rotating propeller blades produce significant fluctuations of the Radar Cross Section (RCS) in the case when the propeller length is about half a wavelength of the illuminating wave. To some extent, this facilitates both the measurement of the RCS in anechoic chamber and the detection of small-sized UAVs. In the present contribution, these studies are extended to the case of multiple propellers, between which an electromagnetic coupling is expected. The scattered field and the RCS is calculated by means of electromagnetic simulation using an integral equation formulation, and the theory is validated against anechoic chamber measurements.

Experimental technique for high-frequency conductivity measurement

“…Using earlier results concerning scattering from rotating objects (Marák et al , 2018, 2019; Peto et al , 2018) and numerical model created using the finite element method (FEM), we perform simulations on the scattering from elongated samples, and give an analysis on the accuracy of the method.…”