Electromagnetic Simulation of Rotating Propeller Blades for Radar Detection Purposes

Marák, Károly; Pető, Tamás; Bilicz, Sándor; Gyimóthy, Szabolcs; Pávó, József

doi:10.1109/tmag.2017.2752904

Cited by 10 publications

(8 citation statements)

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“…As shown in [4], because of the low angular velocity of their rotation (Ω ≈ 100 s −1 ), scattering from Carbon Fiber Reinforced Plastic (CFRP) drone propellers can be modelled using a quasi-static approximation; this means calculating the scattered field for static orientations of the propeller, and then interpreting the results as a sequence in time. In order to be able to compare to the measurement results (as the spectrumanalyzer measures the spectrum of the scattered field), it is then necessary to transform into the frequency domain.…”

Section: A Theoretical Overviewmentioning

confidence: 99%

“…Since, for the inspected geometries, the rotating propellers are near to each other, we solve the problem without using the far field approximation. Herein, we solve the Electric Field Integral Equation (EFIE) for thin wires [9]: Once the induced currents are calculated, we can then calculate the far field [4].…”

Section: B Scattering From Multiple Propellersmentioning

confidence: 99%

“…Moreover, the unique properties of the reflected signal from the propeller facilitate the identification of the detected object. A simulation technique for the prediction of expected spectral components has recently been proposed in [4].…”

Section: Introductionmentioning

confidence: 99%

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

Pető

Marák

Bilicz

et al. 2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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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.

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Section: A Theoretical Overviewmentioning

confidence: 99%

Section: B Scattering From Multiple Propellersmentioning

confidence: 99%

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

Pető

Marák

Bilicz

et al. 2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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“…The authors’ interest in investigating high-frequency conducting properties arose during experiments investigating the scattering from rotating carbon fiber-reinforced plastic propellers for radar-detection applications (Marák et al , 2018). In Marák et al (2019), it was shown that while for the purposes of radar applications, carbon fiber propellers can be modeled using a perfect electric conductor model, more thorough investigations revealed that the resonant frequency and the magnitude of the field scattered from elongated objects such as propellers is dependent on the conductivity of the object’s material.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

Experimental technique for high-frequency conductivity measurement

Marák

Bilicz

Pávó

2019

COMPEL

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Purpose The purpose of this study is to introduce a novel method for the measurement of electromagnetic material parameters. Design/methodology/approach The main idea behind the approach is the fact that for slabs with elongated shapes, the intensity of the backscattered field and the electromagnetic resonance frequency corresponding to the length of the sample are dependent on the conductivity of the sample’s material. Findings It is shown that for a known scattered field and resonance frequency, it is possible to formulate an inverse problem as to the calculation of the conductivity of the sample’s material at the considered frequencies. To investigate the applicability of the method, demonstrative experiments are performed during which the micro-Doppler effect is used to increase the measurement accuracy. The idea is extended to the case of anisotropic samples, with slight modifications proposed to the experimental setup in the case of significant anisotropy in the investigated material. Practical implications The measurement method may prove useful for the investigation of the high-frequency conductive properties of certain materials of interest. Originality/value To the best of the authors’ knowledge, this is the first time the use of the micro-Doppler effect is proposed for the purpose of the measurement of material parameters.

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