海面低飞目标复合散射计算及分析
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摘要
针对低飞目标与海面复合散射的快速计算问题,对传统的多径散射计算算法进行了改进,提出一种基于镜像反射面元斜率统计的多径散射计算算法。改进算法相比传统的多径散射模型考虑了在重力波调制作用下的确定海面斜率分布特性。对确定海面上镜像反射面元斜率的分布特性进行统计,然后以此对各种斜率下的镜像反射面元的多径耦合散射进行加权,得到总的耦合散射贡献,进而求得目标与确定海面的复合电磁散射特性。仿真实验结果表明,该方法合理解释镜像反射面元斜率缓变对耦合散射的影响,能够有效地对广义布儒斯特效应进行仿真,为进一步对研究时变海面上运动目标的电磁散射特性打下基础。
Aiming at fast computation of the composite scattering oflow-fly target and ocean surface, the improvement of conventional multi-path algorithm is implemented, and a new multi-path algorithm is proposed based on the statistics of mirror facets' slope.New algorithm takes the modulation from gravity into account in comparison with conventional algorithm. The distribution of mirror facets' slope is counted from a determined ocean surface, and the multi-path coupling is summed with a weight coefficient, which scatters from mirror facets with different slope. Furthermore, the coupling scattering characteristic is obtained from target and ocean surface. Simulation result indicates that the proposed algorithm could explain how the coupling scattering is affected by the slow change of mirror facets' slope, and could simulate the G-Brewster effect effectively, which lies a solid foundation for electromagnetic scattering research ofthe moving target and time-varied ocean surface.
Aiming at fast computation of the composite scattering oflow-fly target and ocean surface, the improvement of conventional multi-path algorithm is implemented, and a new multi-path algorithm is proposed based on the statistics of mirror facets' slope.New algorithm takes the modulation from gravity into account in comparison with conventional algorithm. The distribution of mirror facets' slope is counted from a determined ocean surface, and the multi-path coupling is summed with a weight coefficient, which scatters from mirror facets with different slope. Furthermore, the coupling scattering characteristic is obtained from target and ocean surface. Simulation result indicates that the proposed algorithm could explain how the coupling scattering is affected by the slow change of mirror facets' slope, and could simulate the G-Brewster effect effectively, which lies a solid foundation for electromagnetic scattering research ofthe moving target and time-varied ocean surface.
引文
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[3]姬伟杰,童创明.三维目标与粗糙面复合散射的广义稀疏矩阵平面迭代及规范网格算法[J].物理学报,2011,60(1):1146-1151.Ji Weijie,Tong Chuangming.Bistatic Scattering from Three-dimensional Target on Perfectly Conducting Rough Surface by Using G-SMFSIA/CAG[J].Acta Physical Sinia,2011,60(1):1146-1151.
[4]Cui T J,Weng CC,Chen G,et al.Efficient MLFMA,RPFMA,and FAFFA Algorithms for EM Scattering by Very Large Structures[J].IEEE Transaction on Antennas and Propagation(S0018-926X),2004,52(3):759-769.
[5]Kuang L,Jin Y Q.Bistatic Scattering from a Three-dimensional Object over a Randomly Rough Surface Using the FDTD Algorithm[J].IEEE Transaction on Antennas and Propagation(S0018-926X),2007,55(8):2302-2312.
[6]Liu P,Jin Y Q.Numerical Simulation of Bistatic Scattering from a Target at Low Altitude above Rough Sea Surface under an EM-Wave Incident at Low Grazing Angle by Using Finite Element Method[J].IEEE Transaction on Antennas and Propagation(S0018-926X),2004,52(5):1205-1210.
[7]Liu P,Jin Y Q.The Finite-element Method and Domain Decomposition for Electromagnetic Bistatic Scattering from the Comprehensive Model of a Ship on and a Target above a Large Scale Rough Sea Surface[J].IEEE Transaction on Geoscience and Remote Sensing(S0196-2892),2004,42(5):950-956.
[8]Li L,Dong T L,Li Q X.A Hybrid Method of Scattering from a Dielectric Target above a Rough Surface:TE Case[J].Progress in Electromagnetic Research M(S1937-8726),2013,31(1):71-83.
[9]Guan B,Zhang JF,Zhou XY,et al.Electromagnetic Scattering from Objects above a Rough Surface Using the Method of Moment with Half-space Green Function[J].IEEE Transaction on Geoscience and Remote Sensing(S0196-2892),2009,47(10):3399-3405.
[10]Xu F,Jin Y Q.Bidirectional Analytic Ray Tracing for Fast Computation of Composite Scattering from Electric-large Target over a Randomly Rough Surface[J].IEEE Transaction on Geoscience and Remote Sensing(S0196-2892),2009,57(5):1495-1505.
[11]Li J,Guo L X,Chai S R,et al.Electromagnetic scattering from a PEC object above a dielectric rough sea surface by a hybrid PO–PO method[J].Wave in Random and Complex Media(S1745-5030),2015,25(1):60-74.
[12]Johnson J T.A Numerical Study of Scattering from an Object a Rough Surface[J].IEEE Transaction on Geoscience and Remote Sensing(S0196-2892),2002,57(5):1495-1505.
[13]Wang Y,Xu X J.On Wideband Radar Signature Simulation of Ships over Sea Surface[J].Acta Aeronautica Et Astronautica Sinica(S1000-6893),2009,30(2):337-342.
[14]Chen H,Zhang M,Yin H C.Facet-based Treatment on Microwave Bistatic Scattering of Three-Dimensional Sea Surface With Electromagnetic Large Ship[J].Progress in Electromagnetic Research(S1070-4698),2012,123(1):385-405.
[15]Arnold-Bos A,Khenchaf A,Martin A.Bistatic Radar Imaging of the Marine Environment-part I:Theoretical Background[J].IEEE Transaction on Geoscience and Remote Sensing,2007,45(11):3372-3383.
[16]Chen H,Zhang M,Nie D.Robust Semi-Deterministic Facet Model for Fast Estimation on EM Scattering from Ocean-like Surface[J].Progress in Electromagnetic Research B(S1937-6472),2009,18(18):347-363.
[17]Chen H,Zhang M,Yin H C.Facet-based Simulator for Bistatic Scattering of the Maritime Scene with Electrically Large Ships:Slope Summation Facet Model[J].International Journal of Remote Sensing(S0143-1161),2012,33(21):6927-6941.