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提出了一种基于线特征和SIFT点特征的多源遥感影像配准方法。该方法首先匹配待配准影像和参
考影像中的线特征,利用匹配直线构建虚拟角点 其次,针对传统SIFT算法匹配多源遥感影像特征点存在的
不足,采用线特征约束点特征的方法进行SIFT同名点对的提取 最后结合虚拟角点对及SIFT同名点对构建三角网进行小面元微分纠正。
-A line-based features and SIFT features multi-point sources of remote sensing image
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别对两幅图像提取广义特征点后,
利用基于根均方误差和交叉相关的两级匹配算法完成同名控制点的建立。并以局部加权直线拟合方法来校正图像
的几何畸变。最后建立两幅图像之间的函数映射关系,完成图像的配准。实验结果证明了该方法的有效性。-Do the two images extracted generalized characteristic point, the root mean square error-based and cross-correlation of the two cont
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基于蒙特卡洛方法的主动声纳信号检测性能分析.主动声纳信号检测性能的分析上,目前在计算机仿真中一般假定混响包络的统计特性符合瑞利分布模型。基于此模型,已经有了较完善的理论。然而,在现代高分辨声纳系统中,混响包络的统计特性并不符合瑞利分布模型。此时在接收机工作特性分析时存在大量繁琐的公式推导。因此该文采用蒙特卡洛(M onte Carlo)统计试验方法,实现对瑞利分布混响背景下的主动声纳信号检测性能分析。结合对接收机工作特性曲线的仿真,得出了检测概率的理论值和仿真结果的误差曲线。误差曲线表明,蒙特卡
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With the development of power systems and the
extensive application of nonlinear elements in the electricity
system, the problem of ferroresonance do harm to the network
and electricity facilities has become more prominent. Wavelet
analysis h
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The output characteristic of a photovoltaic array is nonlinear and changes with solar irradiation and the cell’s
temperature. Therefore, a Maximum Power Point Tracking (MPPT) technique is needed to draw peak power the solar
array to maximize the
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This Paper consists on the study of one part of wind energy system conversion, its AC side.
Renewable resources are in constant fluctuation. This situation could put in peril the energizing efficiency towards a given demand requirement.
Therefor
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求出的傅里叶变换。画出其幅频特性和相频特性曲线(提示:用1024点FFT近似)
-Seek out the Fourier transform. Draw its amplitude frequency characteristic and phase frequency characteristic curve (hint: use 1024 point FFT approximation)
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