距离-速度二维波形分析跟踪

提出一种用于 MTD体制雷达的速度 -距离跟踪技术 :距离 -速度二维波形分析数字动目标跟踪技术。它是在距离波形分析数字动目标跟踪技术的基础上发展出来的。距离 -速度二维波形分析数字动目标跟踪是通过高速采样存储 N次雷达脉冲回波信号 ,在 MTD处理 (如 FFT)后 ,分析回波波形信息获取目标的距离和速度误差而进行自动跟踪的。距离 -速度二维波形分析数字动目标跟踪技术和距离波形分析数字动目标跟踪技术相比 ,利用的回波信息更全面 。

二维波状地形上的流场

在一个简化的二层模式中，求解大气波动方程，得到了二维波状起伏地形上扰动流线的分析解。研究了在上、下两层大气中，不同的温度廓线和风速廓线情况下，地形引起扰动的流场形式，同时讨论了支配扰动振幅的大气因子和地形特征，分析解的结果表明：若大气低层为深厚的不稳定层，地形引起的波动很微弱；如低层大气强稳定，上层大气弱稳定，则可能产生较强的波动；而当上层稳定度增加时，可产生非陷波，有利于高层动量下传，造成较大的地面风速。

一种基于Keystone变换的运动目标相参积累方法

以宽带线性调频连续波体制雷达为背景,研究了运动目标长时间相参积累时的距离走动和多普勒展宽特性,给出了相应的距离多普勒平面展宽面积与信噪比损失的显式函数,进而提出了一种基于距离-多普勒二维最小波形熵的速度模糊次数寻优准则。结合Keystone变换和CLEAN算法探讨了强杂波背景下的运动目标相参处理流程,最后利用仿真实验验证了文中所提算法的有效性。

SOLVING THE PROPAGATION OF ELECTROMAGNETIC WAVE IN A SIMPLE TWO-DIMENSIONALINHOMOGENEOUS MEDIUM BASED ON SYMPLECTIC GEOMETRICAL THEORY

A new symplectic geometrical high-frequency approximation method for solving the propagation of electromagnetic wave in the two-dimensional inhomogeneous medium is used in this paper. The propagating caustic problem of electromagnetic wave is translated into non-caustic problem by the coordinate transform on the symplectic space. The high-frequency approximation solution that includes the caustic region is obtained with the method combining with the geometrical optics. The drawback that the solution in the caustic region can not be obtained with geometrical optics is overcome by this method. The results coincide well with that of finite element method.

Klein Paradox of Two-Dimensional Dirac Electrons in Circular Well Potential

We study two-dimensional massive Dirac equation in circular well potential. The energies of bound states are obtained. We demonstrate the Klein paradox of this relativistic wave equation:For large enough potential depth, the bound states disappear from the spectra. Applications to graphene systems are discussed.