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high-resolution-one-dimension
高分辨率要求系统具有大的带宽,瞬时带宽的增加必将提高系统对硬件的要求,本文采用方便灵活的步进频率波形信号。脉间频率步进波形通过子脉冲载频的步进变化来获得大的有效带宽,使成像具有高分辨率,采用加窗和补零方法提高信噪比,但该信号对目标径向速度非常敏感。采用补零方法提高距离取样分辨率,使距离像细化,并用公式说明了补零只能提高距离取样分辨率,并不能改变频率步进信号的距离分辨能力。该信号波形对目标径向速度的敏感,使目标能量分散到邻近的距离单元造成距离分辨率下降,如果不事先进行速度补偿,直接对回波信号进行逆傅立叶变换,将使所成一维距离像发生频谱展宽,并伴有距离像发生平移。本文证明了当目标有径向速度时仍采用对回波信号直接进行逆傅立叶变换的方法将使一维距离像发生频谱展宽并伴有距离像发生频移,从而严重影响了一维距离像的质量。(high-resolution requirements of the system with large bandwidth, the increased instantaneous bandwidth will improve the system of hardware, In this paper, a flexible and convenient step frequency signals. Pulse frequency step-pulse waveform through the carrier frequency step to achieve great changes in the effective bandwidth. make imaging with high resolution, increasing the window and fill methods to improve signal-to-noise ratio is, However, the signal on the target radial velocity is very sensitive. Using zero-distance sampling method to improve resolution, so that distance as refinement, and formulates a zero-distance sampling can improve resolution, does not alter the frequency of the signal from stepping resolution capabilities. The signal waveform on the target radial velocity sens)
- 2007-04-07 22:15:33下载
- 积分:1
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2DPhC_PWEBandstructure
声子晶体能带结构计算程序,对初学者帮助很大,希望能帮助需要的人(People phononic band structure calculation program for beginners great help, hoping to help needed)
- 2020-11-16 10:19:41下载
- 积分:1
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k-means-clustering
用C语言程序通过先随机选取K个对象作为初始的聚类中心。然后计算每个对象与各个种子聚类中心之间的距离,把每个对象分配给距离它最近的聚类中心。聚类中心以及分配给它们的对象就代表一个聚类。一旦全部对象都被分配了,每个聚类的聚类中心会根据聚类中现有的对象被重新计算。(C Programming Language by first randomly selected the K object as initial cluster centers. And then calculate the distance between each object and each seed cluster center, and assign each object to its nearest cluster center. Cluster centers, and the object assigned to them on behalf of a clustering. Once all the objects are assigned to each cluster cluster centers will be based on the existing object clustering is recalculated.)
- 2012-09-20 11:50:09下载
- 积分:1
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bearing-fault-frequency-calculation
故障频率计算程序,计算轴承各部件的故障频率(Failure rate calculation program to calculate the bearing parts of the fault frequency)
- 2020-12-20 15:49:09下载
- 积分:1
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invGreville
矩阵的广义逆计算,共两种方法,其中迭代法有一阶收敛和二阶收敛(generalized inverse matrix calculation, a total of the two methods, which iteration is a second-order convergence and convergence)
- 2006-10-29 13:10:38下载
- 积分:1
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最小二乘
说明: 最小二乘法寻找最佳函数匹配,用以数值计算,优化曲线(The least square method is used to find the best function matching for numerical calculation and curve optimization.)
- 2020-11-18 09:29:39下载
- 积分:1
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wolfe
wolfe程序模块的C++算法,可以重复使用,对于解决一维搜索是很好的..(C++ algorithm wolfe program modules can be reused for solving one-dimensional search is good ..)
- 2014-02-25 15:11:57下载
- 积分:1
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xcorr
实现互相关运算 C实现,实现互相关运算 C实现(cross correlation C code implementation)
- 2010-01-10 16:49:14下载
- 积分:1
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petsc-3.0.0-p6.tar
PETSc (Portable, Extensible Toolkit for Scientific Computation) 是美国能源部ODE2000 支持开发的20 多个ACTS 工具箱之一,由Argonne 国家实验室开发的可移植可扩展科学计算工具箱,主要用于在分布式存储环境高效求解偏微分方程组及相关问题。(PETSc (Portable, Extensible Toolkit for Scientific Computation) is ODE2000 U.S. Department of Energy to support the development of one of more than 20 ACTS Toolkit, developed by the Argonne National Laboratory' s Portable, Extensible Toolkit scientific computing, mainly used in the distributed memory efficient environment for solving partial differential equations and related issues.)
- 2009-06-15 19:13:38下载
- 积分:1
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shanchen
多孔介质流动程序,基于Shan-Chen模型,使用格子玻尔兹曼理论(Multi-component fluid, using a LB method,based on the Shan-Chen model)
- 2020-09-24 09:07:48下载
- 积分:1