超高速及旋转复杂目标的电磁散射特性研究

项目名称： 超高速及旋转复杂目标的电磁散射特性研究

项目编号： No.61271032

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 夏明耀

作者单位： 电子科技大学

项目金额： 95万元

中文摘要： 弹道导弹和卫星以及正在开发的临近空间飞行体，速度一般达到5个马赫以上,有些目标为了飞行稳定性还伴随着旋转,有些目标有涂敷,对再入体还有尾迹问题。对这一类超高声速及旋转复杂目标的电磁散射特性进行分析，为成像与识别方法研究提供支撑，是当前国家的重大需求，具有重要的学术意义和应用价值。本项目拟采用时域积分方程法和时域体积分法，建立完全基于相对论时空变换和电磁场变换的超高速及旋转复杂目标散射数值分析方法论，可适用于任意复合运动形式，包括匀速、加速、自旋、锥旋、摆振等。对目标的散射特征进行分析和提取，包括超高速和加速产生的多普勒特征和旋转运动产生的微多普勒特征，以及各种复合运动形式对目标成像与识别方法的影响，如一维距离像和二维逆合成孔径成像等。开展低速旋转目标的微多普勒特征测量实验、超高速目标散射特性测量实验，以实测数据对数值模拟方法的可信度进行评估。

中文关键词： 超高速目标；等离子体鞘套；电磁散射；体-面积分方程法；实验

英文摘要： The velocity of ballistic missile, satellite and emerging near space aerocraft is usually greater than five Mach. Some of them may be rotating simultaneously for flying stability. Some of them may have coating material. For re-entry bodies, ionization wake may be produced. Studies of scattering properties of this kind of superfast and rotational complex targets are necessary to support imaging and recognition. It has great academic meaning and application value. In this project, time domain integral equation method and time domain volume integral method are adopted to simulate their responses in the target frame, which can be in arbitrarily motion, such as hypervelocity combined acceleration, spinning or conning. Based on the so-called frame-hopping method, the scheme will be completely relativistic, i.e., relativistic transforms of coordinates and fields between laboratory frame and target frame will be derived and applied. Extraction of scattering properties will be performed, including the Doppler and micro-Doppler characteristics resulting from bulk translations and simultaneous rotations, respectively. Influences of motions on the 1D range profile and 2D ISAR imaging will be analyzed. Experimental studies will be conducted, including extraction of micro-Doppler characteristics of rotating objects and measur

英文关键词： hypersonic object；plasma sheath；electromagnetic scattering；volume-surface integral equation method；experiment