scholarly journals Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath

2020 ◽  
Vol 12 (17) ◽  
pp. 2740
Author(s):  
Zheng Bian ◽  
Jiangting Li ◽  
Lixin Guo
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Radar Cross Section ◽  
Hypersonic Vehicle ◽  
Plasma Sheath ◽  
Flying Height ◽  
Head Region ◽  
Em Scattering ◽  
X Band ◽  
Scale Matrix

Based on the detection platform of space-borne radar (SBR), the dynamic electromagnetic (EM) scattering characteristics of a hypersonic vehicle covered with plasma sheath are calculated and analyzed by the physical optics (PO) method. Using the angle-time conversion method, the dynamic radar cross section (DRCS) of the vehicle in horizontal flying path and different flying states is solved in the range of L-band to X-band. The relevant effective statistical features are extracted from the time-scale matrix of DRCS based on continuous wavelet transform (CWT). The numerical results show that: At different flying altitudes, the backscattering radar cross section (BRCS) of the hypersonic vehicle covered with plasma sheath has irregular fluctuation and large range reduction in the head region of the vehicle. Generally, the higher the incident EM wave frequency is, the more detailed the fluctuation characteristics of the DRCS can be reflected. Within the same radar illuminate angle range, the time consumed by the vehicle DRCS is inversely proportional to the flying height and flying speed and is directly proportional to the detection altitude of the SBR. Besides, the different kinds of statistical eigenvalues extracted from DRCS will play an important role in hypersonic targets classification and recognition.

Decomposing the Non-Gaussian Surface in Sum of Gaussian Surfaces

2012 ◽  
Vol 580 ◽  
pp. 170-174
Author(s):  
Zhang Xing Qi ◽  
Zhen Sen Wu ◽  
Zi Wen Yu ◽  
Hai Ying Li
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Radar Cross Section ◽  
Kirchhoff Approximation ◽  
Munk Function ◽  
The Difference ◽  
Non Gaussian ◽  
Gaussian Surface

The decomposition of the multivariate Non-Gaussian PDF in the sum of a Gaussian PDF instead of the Gram-Charlier series is investigated. Four parameters need to be found by minimizing the integrated square of the difference between Cox-Munk function and its approximation. The backscattering radar cross section (RCS) of the surface is calculated by the Kirchhoff approximation (KA) under different value of k using the formula of decomposition of the Non-Gaussian. The condition of KA satisfying electromagnetic scattering scale from Gaussian and Non-Gaussian surfaces is taken into account by computing the backscattering coefficients in HH and VV polarity.

SRR-Based High Gain Microstrip Antenna with Low Radar Cross Section

2014 ◽  
Vol 644-650 ◽  
pp. 4092-4094
Author(s):  
Shu Juan Wang
Keyword(s):  
Cross Section ◽  
Microstrip Antenna ◽  
Radar Cross Section ◽  
High Gain ◽  
Ring Resonators ◽  
Analysis Method ◽  
Split Ring ◽  
Split Ring Resonators ◽  
X Band ◽  
Scattering Wave

The split ring resonators (SRR) is designed to work at X band and its equivalent medium parameters are estimated by using the equivalent analysis method. The high gain microstrip antenna, which is based on Photonic BandGap (PBG) structure, is also studied. To make the scattering wave deviates mirror direction and reduce the out-band Radar Cross Section (RCS) without affecting the performance of antenna, the designed SRR is used as the cover of PBG structure microstrip antenna. The results show that the forward gain of PBG structure antenna is 0.8 dB higher than the tradition antenna. After the SRR covers on the PBG structure antenna, the gain of antenna is unchanged and the RCS of the mirror direction decreases for all incident angles, and the most decrement is 21.05 dB.

scholarly journals Comparison of Three Different Styles of Submarine Sails on Electromagnetic Scattering under the Detection of Airborne Radar

2018 ◽  
Vol 17 ◽  
pp. 02003
Author(s):  
Ji Liu ◽  
Peilin Huang ◽  
Yaodong Zhao ◽  
Jinzu Ji ◽  
Fengli Xue
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Pitch Angle ◽  
Elevation Angle ◽  
3D Models ◽  
Radar Cross Section ◽  
Physical Optics ◽  
Airborne Radar ◽  
Range Analysis ◽  
Radar Antenna

This paper studies radar cross section of submarine sails on the water. Under the detection of the enemy’s airborne radar, considering the motion of the submarine, the sail model of radar pitch angle incidence range analysis is established. By using CATIA software, the 3D models of AKULA sail, SUBOFF sail and VICTOR sail are built. On the basis of the physical optics method and the equivalent currents method, the scattering characteristics of sails RCS(radar cross section) are simulated under X radar band. Through the microwave anechoic chamber test, this paper verifies the accuracy of the combination of the physical optics method and the equivalent electromagnetic flow method. The influence of the distance from the airborne radar to the sail on the pitch angle of the electromagnetic wave is discussed, with the elevation angle of the radar antenna varies. Then, we illustrate the characteristics of circumferential direction RCS of the sail under different pitch angles. Finally, the mean RCS of the sail at a given pitch angle is simulated. The results show that the AKULA sail is considerably superior to SUBOFF sail and VICTOR sail on stealth performance with the pitch angle less than 4° . But when the pitch angle exceeds 10°, the SUBOFF sail can be given priority.

scholarly journals Certified reduced basis method for electromagnetic scattering and radar cross section estimation

2012 ◽  
Vol 233-236 ◽  
pp. 92-108 ◽  
Author(s):  
Yanlai Chen ◽  
Jan S. Hesthaven ◽  
Yvon Maday ◽  
Jerónimo Rodríguez ◽  
Xueyu Zhu
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Radar Cross Section ◽  
Reduced Basis Method ◽  
Reduced Basis ◽  
Basis Method

scholarly journals Analysis of the Radar Cross Section of an X-band Active Transponder

2011 ◽  
Vol 22 (3) ◽  
pp. 327-335
Author(s):  
Ji-Hwan Hwang ◽  
Soon-Gu Kwon ◽  
Joong-Sun Won ◽  
Yi-Sok Oh
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
X Band

Radar Cross Section Measurements and Simulations of a Model Airplane in the X-band

PIERS Online ◽  
2009 ◽  
Vol 5 (4) ◽  
pp. 377-380 ◽  
Author(s):  
Inácio M. Martin ◽  
Mauro Angelo Alves ◽  
G. G. Peixoto ◽  
Mirabel C. Rezende
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
X Band

scholarly journals Hybrid Deflection of Spoiler Influencing Radar Cross-Section of Tailless Fighter

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8459
Author(s):  
Zeyang Zhou ◽  
Jun Huang
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Deflection Angle ◽  
Elevation Angle ◽  
Radar Cross Section ◽  
Control Surface ◽  
Linear Mode ◽  
Linear Dynamic ◽  
The Given ◽  
Control Surfaces

With the continuous development of advanced fighters towards tailless and flying wing layouts, diverse control surfaces have become the mainstream design. To study the influence of spoiler control surface on the radar cross-section (RCS) of a tailless fighter, a calculation method is presented. The deflection angle of the spoiler is controlled by the fixed mode, linear mode, and smooth mode. The results show that the opening action of the spoiler will break the original stealth characteristics of the aircraft at the key azimuth angles of the head and tail. As the elevation angle increases, this adverse effect will spread to the side. The influence of the different dynamic deflection modes of the spoiler on the aircraft RCS is analyzed. Compared with the linear dynamic deflection mode, the smooth dynamic deflection mode is conducive to the reduction in the average RCS at the given head azimuth. The presented method is effective to study the influence of the spoiler deflection on the electromagnetic scattering characteristics of the tailless aircraft.

scholarly journals Study of the Radar Cross-Section of Turbofan Engine with Biaxial Multirotor Based on Dynamic Scattering Method

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5802
Author(s):  
Zeyang Zhou ◽  
Jun Huang
Keyword(s):  
Cross Section ◽  
Electromagnetic Scattering ◽  
Radar Cross Section ◽  
Scattering Method ◽  
Turbofan Engine ◽  
Factors Affecting ◽  
Turbofan Engines ◽  
Scattering Characteristic ◽  
Rotor Dynamic ◽  
Dynamic Scattering

With the continuous advancement of rotor dynamic electromagnetic scattering research, the radar cross-section (RCS) of turbofan engines has attracted more and more attention. In order to solve the electromagnetic scattering characteristics of a biaxial multirotor turbofan engine, a dynamic scattering method (DSM) based on dynamic simulation and grid transformation is presented, where the static RCS of the engine and its components is calculated by physical optics and physical theory of diffraction. The results show that the electromagnetic scattering of the engine is periodic when the engine is working stably, while the rotors such as fans and turbines are the main factors affecting the dynamic electromagnetic scattering and the ducts greatly increase the overall RCS level of the engine. The proposed DSM is effective and efficient for studying the dynamic electromagnetic scattering characteristic of the turbofan engine.

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