一种适于缝隙等表面缺陷类目标的评估方法
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摘要
缝隙等表面缺陷类目标对飞行器的隐身性能具有重要影响。根据缝隙等表面缺陷类目标的散射机理,该文提出一种载体背景对消方法,用于评估表面缺陷类目标散射。该方法将载体作为目标背景的一部分,通过矢量场相减的方式对消掉载体的自身散射影响,特别是载体强散射角域的散射影响,从而获得了全角域范围内表面缺陷类目标的散射特性数据,解决了使用常规方法目标受载体影响无法获得完整散射特性的问题。通过数值计算和实验测量的结果对比表明:该方法可以对缺陷类目标的电磁散射特性进行有效评估。对消后载体散射得到了极大程度的降低,有效提高了缺陷类目标的计算或测量精度;同时由于排除载体自身散射的影响,避免了对载体尺寸、超低散射特性的要求,有效降低了载体的加工设计成本。
Surface defects such as gaps have a significant impact on the stealth performance of the aircraft.According to the scattering mechanism of surface defects such as gaps, a method of evaluating the surface defect targets based on vector cancellation is proposed. The carrier is regarded as the target background and is subtracted the scattering effect of the carrier, especially the strong scattering angle of the carrier, and then the scattering characteristic data of the surface defect class target in the whole angle range are obtained, which solves the problem that the complete scattering characteristic can not be obtained using the conventional method. The comparison between the numerical calculation and the experimental results shows that the vector cancellation method can effectively evaluate the electromagnetic scattering characteristics of defective targets.After vector cancellation, the scattering of the carrier is greatly reduced, and the calculation or measurement accuracy of the defective target is effectively improved. At the same time, due to reducing the influence of the scattering of the carrier itself, this method avoids the requirement of the carrier size and ultra-low scattering characteristics, and reduces effectively the processing cost of the carrier.
Surface defects such as gaps have a significant impact on the stealth performance of the aircraft.According to the scattering mechanism of surface defects such as gaps, a method of evaluating the surface defect targets based on vector cancellation is proposed. The carrier is regarded as the target background and is subtracted the scattering effect of the carrier, especially the strong scattering angle of the carrier, and then the scattering characteristic data of the surface defect class target in the whole angle range are obtained, which solves the problem that the complete scattering characteristic can not be obtained using the conventional method. The comparison between the numerical calculation and the experimental results shows that the vector cancellation method can effectively evaluate the electromagnetic scattering characteristics of defective targets.After vector cancellation, the scattering of the carrier is greatly reduced, and the calculation or measurement accuracy of the defective target is effectively improved. At the same time, due to reducing the influence of the scattering of the carrier itself, this method avoids the requirement of the carrier size and ultra-low scattering characteristics, and reduces effectively the processing cost of the carrier.
引文
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[18]袁宁,聂小春,梁昌洪.有限厚导电平板上任意缝隙的耦合特性分析[J].电波科学学报,1999,14(3):261-267.doi:10.13443/j.cjors.1999.03.004.YUAN Ning,NIE Xiaochun,LIANG Changhong.Analysis of coupling properties of an arbitrary slit in a thick conducting plate[J].Chinese Journal of Radio Science,1999,14(3):261-267.doi:10.13443/j.cjors.1999.03.004.
[19]曾学刚,林为干,阮成礼.有耗目标的电磁相似性及矩形涂覆平板RCS的缩比关系[J].应用科学学报,1993,11(3):213-218.ZENG Xuegang,LIN Weigan,and RUAN Chengli.The electromagnetic similitude of the object containing lossy materials and the RCS scaled-down relationships of the coated plate[J].Journal of Applied Sciences,1993,11(3):213-218.
[20]黄沛霖,刘战合.飞行器表面缝隙电磁散射特性研究[J].航空学报,2008,29(3):675-680.doi:10.3321/j.issn:1000-6893.2008.03.023.HUANG Peilin and LIU Zhanhe.Research on electromagnetic scattering characteristics of slits on aircraft[J].Acta Aeronautica et Ast ronautica Sinica,2008,29(3):675-680.doi:10.3321/j.issn:1000-6893.2008.03.023.
[21]吕可,郑威.角反射体RCS微波暗室测量及分析[J].计算机测量与控制,2016,24(9):28-31.doi:10.16526/j.cnki.11-4762/tp.2016.09.008.LüKe and ZHENG Wei.Measurement and analysis of corner reflector’s RCS in microwave anechoic chamber[J].Computer Measurement and Control,2016,24(9):28-31.doi:10.16526/j.cnki.11-4762/tp.2016.09.008.
[2]桑建华,张宗斌,王烁.低RCS飞行器表面弱散射源研究[J].航空工程进展,2012,3(3):257-262.doi:10.16615/j.cnki.1674-8190.2012.03.008.SANG Jianhua,ZHANG Zongbin,and WANG Shuo.Research on the radar cross section of weak scatters on stealth vehicle[J].Advances in Aeronautical Science and Engineering,2012,3(3):257-262.doi:10.16615/j.cnki.1674-8190.2012.03.008.
[3]何国瑜,卢才成,洪家才,等.电磁散射的计算和测量[M].北京:北京航空航天大学出版社,2006:19-20.HE Guoyu,LU Caicheng,HONG Jiacai,et al.The Computation and Test for RCS[M].Beijing:Beihang University Press,2006:19-20.
[4]刘战合,黄沛霖,高旭.表面不连续特征双站散射特性的试验研究[J].航空学报,2009,30(12):2322-2327.doi:10.3321/j.issn:1000-6893.2009.12.013.LIU Zhanhe,HUANG Peilin,and GAO Xu.Experimental research on biostatic scattering characteristics of surface discontinuous character[J].Acta Aeronautics et Astronautica Sinica,2009,30(12):2322-2327.doi:10 .3321/j.issn:1000-6893.2009.12.013.
[5]刘战合,蒋胜矩,姬金祖,等.基于MLFMA的表面台阶多频散射特性[J].探测与控制学报,2009,31(z1):20-24.doi:10.3969/j.issn.1008-1194.2009.z1.007.LIU Zhanhe,JIANG Shengju,JI Jinzu,et al.Multifrequencies scattering characteristic of steps in surface based on MLFMA[J].Journal of Detection&Control,2009,31(z1):20-24.doi:10.3969/j.issn.1008-1194.2009.z1.007.
[6]袁俊超,张小宽,孙铭,等.基于FEKO隐身飞机目标动态角闪烁特性实时仿真[J].现代雷达,2017,39(8):58-62.doi:10.16592/j.cnki.1004-7859.2017.08.013.YUAN Junchao,ZHANG Xiaokuan,SUN Ming,et al.Analysis of stealth aircraft target’s dynamic angular glint charac teristics based on FEKO[J].Modern Radar,2017,39(8):58-62.doi:10.16592/j.cnki.1004-7859.2017.08.013.
[7]赵京城,杨涛,付鑫如,等.基于载体对消方法的缝隙小角域散射特性研究[J].北京航空航天大学学报,2018,44(7):1554-1561.doi:10.13700/j.bh.1001-5965.2017.0498.ZHAO Jingcheng,YANG Tao,FU Xinru,et al.Research on small angle domain scattering characteristics based on carrier cancellation method[J].Journal of Beijing University of Aeronautics and Astronautics,2018,44(7):1554-1561.doi:10.13700/j.bh.1001-5965.2017.0498.
[8]WU Taitsun.High frequency scattering[J].Physics Review Journals,1956,104(5):1201-1212.
[9]LAGER D L and LYTLE R J.Determining a subsurface electromagnetic profile from high-frequency measurements by applying reconstruction-technique algorithms[J].Radio Science,2016,12(2):249-260.
[10]HARRING Roger F.Field Computation by Moment Methods[M].London,England:Macmillan,1968:120-148.
[11]张文,胡俊,张婕玲,等.一种新型的矩量法并行实现方法[J].微波学报,2017,33(S1):26-29.ZHANG Wen,HU Jun,ZHANG Jieling,et al.A new parallel realization for MOM[J].Journal of Microwave,2017,33(S1):26-29.
[12]CHEN K S,WU Tzongdar,TSANG Leung,et al.Emission of rough surfaces calculated by the integral equation method with comparison to three-dimensional moment method simulations[J].IEEE Transactions on Geoscience&Remote Sensing,2003,41(1):90-101.doi:10.1109/TGRS.2002.807587.
[13]高旭,杨硕,柴建忠,等.基于矢量对消的缺陷类目标散射试验改进方法[J].北京航空航天大学学报,2017,43(7):1293-1299.doi:10.13700/j.bh.1001-5965.2016.0517.GAO Xu,YANG Shuo,CHAI Jianzhong,et al.Improved measurement method based on vector cancellation for scattering characteristic of electromagnetic discontinuities targets[J].Journal of Beijing University of Aeronauties and Astronautics,2017,43(7):1293-1299.doi:10.13700/j.bh.1001-5965.2016.0517.
[14]赵京城,田进军,杨硕,等.一种弱散射目标的RCS测量方法[P].中国专利,CN106443611A.2017.ZHAO Jingcheng,TIAN Jinjun,YANG Shuo,et al.A RCSmeasurement method for electromagnetic discontinuities tar-gets[P].Patent,China,CN106443611A,2017.
[15]SENIOR T B A,SARABANDI K,and NATZKE J R.Natzke scattering by a narrow gap[J].IEEE Transactions on Antennas and Propagation,1990,38(7):1102-1110.doi:10.1109/8.55624.
[16]PARK T J,KANG S H,and EOM H J.TE scattering from a slit in a thick conducting screen:Revisited[J].IEEETransactions On Antennas And Propagation,1994,42(1):112-114.doi:10.1109/8.272309.
[17]SHENG Xining,YUNG Edward K N,CHAN C H,et al.Scattering from a large body with cracks and cavities by the fast and accurate finite-element boundary-integral method[J].IEEE Transactions on Antennas and Propagation,2000,48(8):1153-1160.doi:10.1109/8.884482.
[18]袁宁,聂小春,梁昌洪.有限厚导电平板上任意缝隙的耦合特性分析[J].电波科学学报,1999,14(3):261-267.doi:10.13443/j.cjors.1999.03.004.YUAN Ning,NIE Xiaochun,LIANG Changhong.Analysis of coupling properties of an arbitrary slit in a thick conducting plate[J].Chinese Journal of Radio Science,1999,14(3):261-267.doi:10.13443/j.cjors.1999.03.004.
[19]曾学刚,林为干,阮成礼.有耗目标的电磁相似性及矩形涂覆平板RCS的缩比关系[J].应用科学学报,1993,11(3):213-218.ZENG Xuegang,LIN Weigan,and RUAN Chengli.The electromagnetic similitude of the object containing lossy materials and the RCS scaled-down relationships of the coated plate[J].Journal of Applied Sciences,1993,11(3):213-218.
[20]黄沛霖,刘战合.飞行器表面缝隙电磁散射特性研究[J].航空学报,2008,29(3):675-680.doi:10.3321/j.issn:1000-6893.2008.03.023.HUANG Peilin and LIU Zhanhe.Research on electromagnetic scattering characteristics of slits on aircraft[J].Acta Aeronautica et Ast ronautica Sinica,2008,29(3):675-680.doi:10.3321/j.issn:1000-6893.2008.03.023.
[21]吕可,郑威.角反射体RCS微波暗室测量及分析[J].计算机测量与控制,2016,24(9):28-31.doi:10.16526/j.cnki.11-4762/tp.2016.09.008.LüKe and ZHENG Wei.Measurement and analysis of corner reflector’s RCS in microwave anechoic chamber[J].Computer Measurement and Control,2016,24(9):28-31.doi:10.16526/j.cnki.11-4762/tp.2016.09.008.