海面环境下舰船目标电磁散射研究

发布时间：2018-03-22 00:16

本文选题：海面　切入点：电磁散射　出处：《哈尔滨工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：关于海面雷达探测的研究始终是一个重要的课题,当机载或舰载雷达在海面背景下对军事目标进行探测时,电磁回波信号中包含了正常回波以及在背景情况下的电磁散射信号,深入对复杂环境和目标电磁散射回波相关问题的研究是目前国防科研中的重要方向,也为雷达精确探测、制导、海面微波遥感、海面不规则目标探测与遥感提供理论基础和可靠的分析方法,所以研究影响复杂环境与目标的电磁散射回波的相关问题已经成为国防科技的重要研究技术之一。本文着重分析海面环境下舰船目标电磁散射的相关问题,结合某舰模型与标准粗糙海面,建立适合分析海面与目标电磁散射的模型,在蒸发波导、不同海情及两种情况共同制约时的几种环境下,剖析影响目标雷达回波的作用机理。主要研究的内容包括:1、分别在不同雷达入射角域内,探讨和分析了海面后向散射系数与雷达参数及海面状态的影响关系。2、在蒸发波导环境下,对目标雷达回波进行仿真研究,讨论了辐射源高度与波导高度的相对位置及蒸发波导的特征量对目标雷达回波的影响。3、在不同海情状态下,对目标雷达回波进行仿真分析,从各个角域范围分别讨论了目标雷达回波随海情的变化情况,分析影响目标雷达回波的作用机理。4、考虑蒸发波导和不同海情共同制约的环境下目标雷达回波情况,对粗糙海面蒸发波导传播进行了深层次的研究。本文采用理论分析和仿真实验相结合的方式,通过仿真分析可知,海面后向散射系数和雷达参数及海面状态密切相关,且变化情况随之有一定规律;海面蒸发波导增强了雷达对海面附近目标的探测能力,随着波导高度增加探测能力增强,且大气湿度对蒸发波导传播有一定影响;目标雷达回波在各个角域范围随海情的变化规律呈一定趋势,深入对其作用机理进行了理论分析和总结;通过目标雷达回波分析可知,海面粗糙度对蒸发波导传播有一定影响,海面越粗糙,则有更多的陷获能量被散射掉。总之,由于海面自身的条件及随机多变的特性,目标雷达散射回波会受到不同程度的影响,且通过理论分析验证了仿真结果的可靠性,为海面雷达侦测提供了参考依据。
[Abstract]:The research on sea surface radar detection is always an important subject. When airborne or shipborne radar detects military targets in the sea background, the electromagnetic echo signal contains the normal echo and the electromagnetic scattering signal in the background. Deep research on the problems related to the electromagnetic scattering echoes of complex environments and targets is an important direction in the field of national defense research at present. It is also for radar precise detection, guidance, and microwave remote sensing of the sea surface. The detection and remote sensing of irregular targets on the sea provide a theoretical basis and a reliable analytical method. Therefore, it has become one of the important research techniques of national defense science and technology to study the electromagnetic scattering echo of complex environment and target. Combined with a ship model and standard rough sea surface, a model suitable for analyzing electromagnetic scattering from sea surface and target is established. Under the conditions of evaporation waveguide, different sea conditions and two kinds of conditions, The main contents of the research include: 1, in the different radar incident angle domain, The influence of sea surface backscattering coefficient on radar parameters and sea surface state is discussed and analyzed. In the environment of evaporative waveguide, the target radar echo is simulated. The effects of the relative position of the radiator height and the waveguide height and the characteristic quantity of the evaporative waveguide on the target radar echo are discussed. The simulation analysis of the target radar echo is carried out under different sea conditions. The variation of target radar echo with sea condition is discussed from each angle domain, and the mechanism of affecting target radar echo is analyzed. The target radar echo is considered in the environment of evaporation waveguide and different sea conditions. The propagation of evaporation waveguide on rough sea surface is studied in depth. In this paper, by combining theoretical analysis and simulation experiment, it can be seen that the backscattering coefficient is closely related to radar parameters and sea surface state, and the simulation results show that the backscattering coefficient of the sea surface is closely related to the radar parameters and the state of the sea surface. The surface evaporation waveguide enhances the radar's ability to detect the target near the sea surface, and the detection ability increases with the increase of the waveguide height, and the atmospheric humidity has a certain influence on the evaporation waveguide propagation. The target radar echo has a certain trend with the sea conditions in each angle region. The mechanism of the target radar echo is analyzed and summarized theoretically, and the surface roughness has a certain influence on the evaporation waveguide propagation through the target radar echo analysis. The rougher the sea surface, the more trapped energy will be scattered. In short, because of the sea surface's own conditions and random and changeable characteristics, the target radar scattering echo will be affected to varying degrees. The reliability of the simulation results is verified by theoretical analysis, which provides a reference for sea surface radar detection.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN011;TN957.51

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