| High-frequency Back-scattering Cross Section Analysis of Rotating Targets |
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Kook-Hyun Kim, Dae-Seung Cho, Jin-Hyeong Kim |
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| 회전 표적의 고주파수 후방산란단면적 해석 |
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김국현, 조대승, 김진형 |
1(주)한진중공업
2부산대학교 조선해양공학과 |
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| Abstract |
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The high-frequency analysis method of back-scattering cross section spectrum of rotating targets is established. The time history of the back-scattering cross section is calculated using a quasi-stationary approach, based on a physical optics and a physical theory of diffraction, combining an adaptive triangular beam method to consider the shadow effect. And the spectra of back-scattering cross section by the Doppler effect are analyzed applying a simple fast Fourier transform method to its time history. The numerical calculation for rotating targets, such as rotating metal plates and underwater propeller, are carried out. The time history appears to be periodic with respect to the number of wings. The backscattering cross section spectrum level and its frequency shift are dependent on the rotating speed, direction, and the shape of the targets. |
| Key Words:
Rotating Target, Back-scattering Cross Section Spectrum, Doppler Effect, Physical Optics, Physical Theory of Diffraction |
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