Analysis of the Electromagnetic Scattering Characteristic and Identification of Kelvin Wake on 2-D Sea Surfaces by Feature Selective Validation

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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Missile-Borne SAR Raw Signal Simulation for Maneuvering Target

International Journal of Antennas and Propagation ◽

10.1155/2016/2598024 ◽

2016 ◽

Vol 2016 ◽

pp. 1-12

Author(s):

Weijie Xia ◽

Yuanyuan Qi ◽

Linlin Huang ◽

Xue Jin

Keyword(s):

Electromagnetic Scattering ◽

High Speed ◽

Signal Model ◽

Maneuvering Target ◽

Scattering Rate ◽

Stop And Go ◽

Radar Scattering ◽

Signal Simulation ◽

Simulation Input ◽

Scattering Characteristic

SAR raw signal simulation under the case of maneuver and high-speed has been a challenging and urgent work recently. In this paper, a new method based on one-dimensional fast Fourier transform (1DFFT) algorithm is presented for raw signal simulation of maneuvering target for missile-borne SAR. Firstly, SAR time-domain raw signal model is given and an effective Range Frequency Azimuth Time (RFAT) algorithm based on 1DFFT is derived. In this algorithm, the “Stop and Go” (SaG) model is adopted and the wide radar scattering characteristic of target is taken into account. Furthermore, the “Inner Pulse Motion” (IPM) model is employed to deal with high-speed case. This new RFAT method can handle the maneuvering cases, high-speed cases, and bistatic radar cases, which are all possible in the missile-borne SAR. Besides, this raw signal simulation adopts the electromagnetic scattering calculation so that we do not need a scattering rate distribution map as the simulation input. Thus, the multiple electromagnetic reflections can be considered. Simulation examples prove the effectiveness of our method.

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Electromagnetic Scattering of Rough Ground Surface Covered by Multilayers Vegetation

International Journal of Antennas and Propagation ◽

10.1155/2019/9413058 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Yuqi Yang ◽

Wei Luo ◽

Bo Yin ◽

Yi Ren

Keyword(s):

Electromagnetic Scattering ◽

Ground Surface ◽

Coherent Scattering ◽

The Finite Element Method ◽

Microwave Scattering ◽

Internal Mechanism ◽

Relationship Of ◽

The Relationship ◽

Bidirectional Reflectance Distribution ◽

Scattering Characteristic

A microwave scattering model is proposed for the ground surface covered with multilayers vegetation. The vegetation leaves are simulated with the discrete elliptical particles in layers, which are randomly distributed above the randomly rough surface. The finite element method is applied to solve the scattering magnetic field equation based on the Dirichlet boundary, and the relationship between the radar cross section and bidirectional reflectance distribution function is deduced with the coherent scattering field. The internal mechanism of microwave scattering of multilayers vegetation is explored with the numerical results, and the relationship of vegetation growing parameter with scattering characteristic is established.

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ISAR imaging of moving satellite based on GO–PO scattering model

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078717000083 ◽

2017 ◽

Vol 9 (7) ◽

pp. 1499-1507

Author(s):

Jiakun Wang ◽

Min Zhang ◽

Pengbo Wei ◽

Panpan Jiang

Keyword(s):

Electromagnetic Scattering ◽

Great Influence ◽

Multiple Reflections ◽

Antenna Structure ◽

Time Frequency ◽

Large Size ◽

Isar Imaging ◽

Compensation Technique ◽

Complex Target ◽

Scattering Characteristic

An efficient algorithm is proposed for the radar cross-section (RCS) prediction of complex target with electronically large size, which is a combination of geometrical optics and physical optics (GO–PO) method. The method taking the multiple reflections into account is applied to the electromagnetic scattering analysis of a satellite model. Then RCS curves of entire satellite model and the model without antenna structure are figured out. Based on the simulated echoes, the traditional inverse synthetic aperture radar (ISAR) images are discussed. Moreover, an application of motion compensation technique based on the joint time-frequency analysis is presented for ISAR imaging of the moving satellite that has both translational and rotational movements. Numerical results show good performance of GO–PO method in accuracy and efficiency and the great influence of the antenna with corner structures on the scattering characteristic of the satellite.

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