金属—等离子体组合目标极化匹配探测技术研究
发布时间：2019-06-09 20:11
【摘要】：本文的研究内容为金属-等离子体组合目标散射特性和极化匹配探测算法。金属-等离子体组合目标具有一定的隐身能力,是典型的低RCS目标,传统雷达很难将其探测到。建立金属-等离子体组合目标在不同频段、不同入射角、不同再入速度和不同极化入射波照射方式下的散射特性数据库,作为有用的先验信息,并在此基础上选择感兴趣的频段和入射角度,设计不同应用背景下的极化匹配检测器,可以显著地提高雷达对金属-等离子体组合目标的探测能力。围绕这一目标,本文开展了以下主要工作:(1)建立了金属-等离子体组合目标分层模型,并运用电磁计算软件CST研究了金属-等离子体组合目标在不同频段、不同再入速度、不同入射角度和不同极化的入射波照射下的散射特性。(2)在通道无约束情形下的雷达目标回波极化信号增强方面,提出了“三步解耦”+迭代法,克服了传统的搜索算法运算量大,运算时间长的缺点,可运用于实时雷达系统。(3)引入了信杂噪比模型,提出了转化+迭代法,将同极化通道情形和通道无约束情形下功率对比度最优极化方式求解问题转化为功率最大化最优极化方式求解问题,再运用拉格朗日乘数法和“三步解耦”+迭代法求解最优极化方式,算法运算量小、计算时间少、且稳定性好。(4)针对部分均匀环境下,研究了MSD检测器和ASD检测器的检测性能和恒虚警特性,分析了检测器的检测性能与辅助数据量的关系,并且在极化域优化了检测器性能。
[Abstract]:The research content of this paper is the scattering characteristics of metal-plasma combined targets and polarization matching detection algorithm. Metal-plasma combined target has certain stealth ability and is a typical low RCS target, which is difficult to detect by traditional radar. The database of scattering characteristics of metal-plasma combined targets in different frequency bands, different incident angles, different reentry speeds and different polarization incident waves is established as useful prior information. On this basis, the frequency band and incident angle of interest are selected, and the polarization matching detector under different application background is designed, which can significantly improve the detection ability of radar to metal-plasma combined targets. Around this goal, the main work of this paper is as follows: (1) the layered model of metal-plasma combination target is established, and the metal-plasma combination target in different frequency bands is studied by using the electromagnetic calculation software CST. The scattering characteristics of radar target echo polarization signal with different reentry velocity, different incident angle and different polarization. (2) in the aspect of radar target echo polarization signal enhancement under the condition of unconstrained channel, a "three-step decoupling" iterative method is proposed. Overcome the shortcomings of the traditional search algorithm, such as large computation and long operation time, and can be used in real-time radar system. (3) the signal-to-noise ratio (SNR) model is introduced, and the transformation iteration method is proposed. The problem of optimal polarization mode of power contrast in the case of same polarization channel and unconstrained channel is transformed into the problem of optimal polarization mode of power maximization. Then the Lagrangian multiplier method and the "three-step decoupling" iterative method are used to solve the optimal polarization mode. the algorithm has the advantages of small amount of operation, less calculation time and good stability. (4) for partially uniform environment, The detection performance and constant false alarm characteristics of MSD detector and ASD detector are studied, the relationship between the detection performance of the detector and the auxiliary data volume is analyzed, and the performance of the detector is optimized in the polarization domain.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN95
本文编号：2495866
[Abstract]:The research content of this paper is the scattering characteristics of metal-plasma combined targets and polarization matching detection algorithm. Metal-plasma combined target has certain stealth ability and is a typical low RCS target, which is difficult to detect by traditional radar. The database of scattering characteristics of metal-plasma combined targets in different frequency bands, different incident angles, different reentry speeds and different polarization incident waves is established as useful prior information. On this basis, the frequency band and incident angle of interest are selected, and the polarization matching detector under different application background is designed, which can significantly improve the detection ability of radar to metal-plasma combined targets. Around this goal, the main work of this paper is as follows: (1) the layered model of metal-plasma combination target is established, and the metal-plasma combination target in different frequency bands is studied by using the electromagnetic calculation software CST. The scattering characteristics of radar target echo polarization signal with different reentry velocity, different incident angle and different polarization. (2) in the aspect of radar target echo polarization signal enhancement under the condition of unconstrained channel, a "three-step decoupling" iterative method is proposed. Overcome the shortcomings of the traditional search algorithm, such as large computation and long operation time, and can be used in real-time radar system. (3) the signal-to-noise ratio (SNR) model is introduced, and the transformation iteration method is proposed. The problem of optimal polarization mode of power contrast in the case of same polarization channel and unconstrained channel is transformed into the problem of optimal polarization mode of power maximization. Then the Lagrangian multiplier method and the "three-step decoupling" iterative method are used to solve the optimal polarization mode. the algorithm has the advantages of small amount of operation, less calculation time and good stability. (4) for partially uniform environment, The detection performance and constant false alarm characteristics of MSD detector and ASD detector are studied, the relationship between the detection performance of the detector and the auxiliary data volume is analyzed, and the performance of the detector is optimized in the polarization domain.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN95
【参考文献】
相关博士学位论文 前1条
1 柳军;热化学非平衡流及其辐射现象的实验和数值计算研究[D];国防科学技术大学;2004年
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