地海交界分区域复合粗糙面的布儒斯特效应研究
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摘要
通过随机粗糙面建模理论,研究地海交界分区域复合粗糙面的布儒斯特效应.采用蒙特卡罗方法,利用高斯谱函数模拟陆地粗糙面,利用Pierson-Moskowitz(PM)海洋谱模拟海面部分,运用加权反正切函数滤波处理以平滑交界,构建了地海交界分区域复合粗糙面的几何模型.考虑到粗糙陆地表面与海面各自内部面元的耦合作用以及区域之间和交界处面元的相互耦合,提出了一种基于地海交界分区域面元的迭代物理光学法,快速求解地海交界分区域复合粗糙面的镜向散射,分别就陆地粗糙面的均方根高度、相关长度,海面的风速、风向对其布儒斯特效应的影响进行了分析,发现了地海交界分区域复合粗糙面上的"布儒斯特融合效应",并发现陆地粗糙面的均方根高度与海面风速能够显著影响布儒斯特角的"融合"现象.本研究为探测地海交界区域的真实环境提供了理论基础,数值仿真结果对抗多径干扰、雷达目标的探测与识别、遥感信息处理具有借鉴意义.
Based on modeling theory of random rough surface,Brewster effect of composite rough surface of adjacent region between ground and sea is studied.The Monte Carlo method is applied to construct composite rough surface.Gauss spectral function is introduced to generate ground rough surface,and Pierson Moskowitz(PM)spectral function is used to simulate actual sea rough surface.Weighted inverse tangent function is presented to filter in order to smooth the borderline between ground and sea.The geometrical model of composite rough surface of adjacent region between ground and sea is established.The couplings of facets in respective region and facets of region near borderline are considered,and an iterative physical optics(IPO)based on facets of composite rough surface of ground and sea in adjacent region is presented.The electromagnetic scattering in the specular direction of composite rough surface of ground and sea in adjacent region is quickly calculated.The influences of root mean square and correlation length of ground rough surface,and wind velocity and wind direction of sea rough surface on Brewster effect are discussed.The"Brewster fusion effect"of composite rough surface of ground and sea in adjacent region is discovered.And the "fusion"phenomenon of Brewster angle is more remarkably affected by root mean square of ground rough surface and wind velocity of sea rough surface.This research provides theoretical basis for detection of actual environment of ground and sea in adjacent region.Numerical results can be used for reference in the field of reducing multipath interference,radar object detection and identification,and remote sensing information processing.
Based on modeling theory of random rough surface,Brewster effect of composite rough surface of adjacent region between ground and sea is studied.The Monte Carlo method is applied to construct composite rough surface.Gauss spectral function is introduced to generate ground rough surface,and Pierson Moskowitz(PM)spectral function is used to simulate actual sea rough surface.Weighted inverse tangent function is presented to filter in order to smooth the borderline between ground and sea.The geometrical model of composite rough surface of adjacent region between ground and sea is established.The couplings of facets in respective region and facets of region near borderline are considered,and an iterative physical optics(IPO)based on facets of composite rough surface of ground and sea in adjacent region is presented.The electromagnetic scattering in the specular direction of composite rough surface of ground and sea in adjacent region is quickly calculated.The influences of root mean square and correlation length of ground rough surface,and wind velocity and wind direction of sea rough surface on Brewster effect are discussed.The"Brewster fusion effect"of composite rough surface of ground and sea in adjacent region is discovered.And the "fusion"phenomenon of Brewster angle is more remarkably affected by root mean square of ground rough surface and wind velocity of sea rough surface.This research provides theoretical basis for detection of actual environment of ground and sea in adjacent region.Numerical results can be used for reference in the field of reducing multipath interference,radar object detection and identification,and remote sensing information processing.
引文
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[23]姬伟杰,童创明.二维海面上方金属目标复合散射快速算法研究[J].电波科学学报,2012,27(2):307-314.JI W J,TONG C M.Fast alogorithm of calculating the composite scattering from PEC object above sea surface[J].Chinese journal of radio science,2012,27(2):307-314.(in Chinese)
[2]NEJATI H,SARABANDI K.Theoretical analysis of tree trunk rough surface interaction using reaction theorem[J].Journal of applied physics,2011,110(1):5169-5172.
[3]CALAME J P,GARVEN M.Dielectric permittivity simulations of layered composites with rough interfacial surfaces[J].IEEE transactions on dielectrics&electrical insulation,2007,14(2):287-295.
[4]VORONOVICH A G,ZAVOROTNY V U.Full-Polarization modeling of monostatic and bistatic radar scattering from a rough sea surface[J].IEEE transactions on antennas&propagation,2014,62(3):1362-1371.
[5]EL-BAH S,DUSSEAUX R,AFIFI S.Some statistical and spatial properties of signal scattering by 2-D slightly rough random surfaces[J].IEEE transactions on antennas&propagation,2016,64(2):721-729.
[6]REN X C.Study on electromagnetic scattering from Gaussian rough surface of layered medium with circular polarized wave incidence[C]//Cross Strait Quadregional Radio Science&Wireless Technology Conference,2013:308-311.
[7]JOEL T J,ROBERT J B,JAKOV V T,et al.A numerical study of the retrieval of sea surface height profiles from low grazing angle radar data[J].IEEE transactions on antennas&propagation,2009,47(6):1641-1650.
[8]WANG R,GUO L X,WANG A Q.Study on the scattering from sea surface with PM spectrum covered by organic film[C]//IEEE International Symposium on Antennas Propagation&EM Theory,2010:738-741.
[9]李昌泽,童创明,齐立辉,等.三类新型随机粗糙面模型的快速散射特性分析[J].电波科学学报,2015,30(6):1093-1101.LI C Z,TONG C M,QI L H,et al.Analysis on fast electromagnetic scattering characteristics for three novel randomly rough surface models[J].Chinese journal of radio science,2015,30(6):1093-1101.(in Chinese)
[10]SAILLARD M,MAYSTRE D.Scattering from metallic and dielectric rough surfaces[J].Journal of the optical society of America A,1990,7(6):982-990.
[11]GREFFET J J.Theoretical model of the shift of the Brewster angle on a rough surface[J].Optics letters,1992,17(4):238-40.
[12]BAYLARD C,MARADUDIN A A,GREFFET J J.Coherent reflection factor of a random rough surface:applications[J].Journal of the Optical Society of America A,1993,10(12):2637-2647.
[13]TRIZNA D B.Model for Brewster angle damping and multipath effects on the microwave radar sea echo at low grazing angles[J].IEEE transactions on geoscience&remote sensing,1997,35(5):1232-1244.
[14]THOMSON L I,OSINSKI G R,POLLARD W H.Application of the Brewster angle to quantify the dielectric properties of ground ice formations[J].Journal of applied geophysics,2013,99(99):12-17.
[15]隋栋训,童创明,彭鹏,等.超低空目标的广义布儒斯特效应[J].空军工程大学学报(自然科学版),2015(4):29-32.SUI D X,TONG C M,PENG P,et al.Study on GBrewster of super-low altitude target[J].Air Force Engineering University Journal(Natural Edition),2015(4):29-32.(in Chinese)
[16]OBELLEIRO B F,RODRIGUEZ J L,BURKHOLDER R J.An iterative physical optics approach for analyzing the electromagnetic scattering by large open-ended cavities[J].IEEE transactions on antennas&propagation,1995,43(4):356-361.
[17]KAPP D,BROWN G S.A new numerical method for rough-surface scattering calculations[J].IEEE transactions on antennas&propagation,1996,44(5):711.
[18]WEST J C.Analysis of the iterative Kirchhoff approximation for rough surface scattering[C]//IEEE International Symposium Geoscience and Remote Sensing,1999:2410-2412.
[19]SARABANDI K,PARK M.A radar cross-section model for power lines at millimeter-wave frequencies[J].IEEE transactions on antennas&propagation,2003,51(9):2353-2360.
[20]DEHMOLLAIAN M,SARABANDI K.Electromagnetic scattering from foliage camouflaged complex targets[J].IEEE transactions on geoscience&remote sensing,2006,44(10):2698-2709.
[21]DEHMOLLAIAN M,BIGLARY H.Scattering of an object above a rough surface with impedance boundaries using IPO and FMM[C]//IEEE International Symposium Antennas and Propagation Society,2012,1-2.
[22]RASHIDI R E,DEHMOLLAIAN M.Target above random rough surface scattering using aparallelized IPO accelerated by MLFMM[J].IEEE geoscience&remote sensing letters,2015,12(7):1481-1485.
[23]姬伟杰,童创明.二维海面上方金属目标复合散射快速算法研究[J].电波科学学报,2012,27(2):307-314.JI W J,TONG C M.Fast alogorithm of calculating the composite scattering from PEC object above sea surface[J].Chinese journal of radio science,2012,27(2):307-314.(in Chinese)