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雷达隐身与反隐身技术的发展与现状 总被引:4,自引:0,他引:4
讨论现代战场环境中出现的雷达隐身与反隐身课题。阐述当今世界上雷达隐身与反隐身技术的现状及主要代表形式,分析其技术实现途径及发展方向。 相似文献
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Both the homotopy analysis method and Galerkin spectral method are applied to find the analytical solutions of the two-dimensional and time-independent Gross-Pitaevskii equation,a nonlinear Schrdinger equation used in describing the system of Bose-Einstein condensates trapped in a harmonic potential.The approximate analytical solutions are obtained successfully.Comparisons between the analytical solutions and the numerical solutions have been made.The results indicate that they are agreement very well with each other when the atomic interaction is not too strong. 相似文献
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The homotopy analysis method and Galerkin spectral method are applied to find the analytical solutions for the Gross-Pitaevskii equations, a set of nonlinear Schrödinger equation used in simulation of spin-1 Bose-Einstein condensates trapped in a harmonic potential. We investigate the one-dimensional case and get the approximate analytical solutions successfully. Comparisons between the analytical solutions and the numerical solutions have been made. The results indicate that they are in agreement well with each other when the atomic interaction is weakly. We also find a class of exact solutions for the stationary states of the spin-1 system with harmonic potential for a special case. 相似文献
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Detection and Location of a Target in Layered Media by Snapshot Time Reversal and Reverse Time Migration Mixed Method 下载免费PDF全文
A target in layered medium can be located by the ridge-like distribution time reversal and reverse time migration(TR-RTM) mixed method. However, this method cannot distinguish between acoustic field distributions of the interface and target for the wider acoustic pulse signals, which may result in inaccurate location of the target. A snapshot TR-RTM mixed method is proposed to solve this problem. The principle of snapshot TR-RTM mixed method is first given. Experiments are then carried out, and a mountain-like acoustic field distribution is obtained by processing experimental data. The results show that the location of the peak is that of the target, and the ratio of the scattered signal and interface reflection signal(signal-to-interference ratio) is improved by about four times after processing. Furthermore, this method can effectively suppress the interface reflection signal and enhance the target scattering signal. Therefore, it can achieve effective detection and location of a target in a layered medium. 相似文献
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感应电流方向的正确判定杨红娟(云南省建筑材料工业学校昆明650102)楞次定律和右手定则是确定感应电流方向的两种基本方法,下面就如何正确应用这两种方法作一讨论.1正确应用楞次定律判定感应电流的方向1.1应用楞次定律的步骤1.1.1确定穿过线圈原来磁通... 相似文献
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快照的时间反转和逆时偏移方法已实现了液-液分层介质中目标的超声检测和定位,现进一步推广到含有固体分层介质情形。由于在含有固体分层介质中,都存在多种的反射波和散射波,因此提出一种筛选方法,首先从中筛选出散射波以及所属波型,再利用快照的时间反转和逆时偏移方法进行处理。实验分别研究了固-液、液-固和固-固分层介质3种情况。利用快照的时间反转和逆时偏移法进行处理,在空间就形成了一个峰状的分布,其峰顶的位置与实际目标的位置比较吻合,误差在一个波长左右。因而,实现了含有固体分层介质中目标的超声检测和定位。 相似文献