Design of multicolour optical Fourier transform systemwith large spacebandwidth product;
此系统采用无光焦度的衍射器件校正傅立叶变换主镜的球差，使系统得到最大空间带宽积；还采用谐衍射器件的设计方法，使系统可对多种相干光实现光学傅立叶变换。
A Kind of Operator Reconstruction of Fractional Fourier Transform;
一类分数傅立叶变换算子的构造
A novel algorithm for image watermarking in fractional Fourier transform domain
分数傅立叶变换域的一种鲁棒性图像水印算法
The fractional Fourier transform is a linear operator,and will not be influenced by cross terms.
分数傅立叶变换是线性变换,不存在交叉项,采用分数傅立叶变换搜索匹配动目标信号,使其能量汇聚。
The Green function of wide-angle parabolic equation(WAPE) in boundless plane is constructed based on the split-step Fourier transform(SSFT) algorithm.
基于分部傅立叶变换法,建立了宽角抛物方程在二维无界空间的格林函数。
Based on characteristic of ground wave, the electromagnetic scalar wave equation above the inhomogeneous spherical surface is reduced to parabolic equation, then the recursion formula of the solution is presented by split-step Fourier transform.
根据地波传播特性,将不均匀球形地面上空的电磁场满足的标量波动方程近似为一个抛物方程;引入分步傅立叶变换法来得到抛物方程的解的递推公式;由地波传播平地公式计算出抛物方程算法所需初值,按照递推公式可方便的递推出传播路径上空中任意点的场强值,以及分段均匀光滑球形地面上任意高度的地波衰减因子的幅度和相位。
A split-step Fourier transform method for obtaining the solution of this wide-angle parabolic equation under impedance boundary condition is demonstrated in detail, and an example of radio propagation over the sea surface is calculated.
对抛物方程中的伪差分算子进行Feit-Fleck宽角近似处理,分析了这种近似所带来的误差;详细阐述了阻抗边界条件下求解这种宽角抛物方程的分步傅立叶变换方法,并以此计算了海平面上电波传播情况,与窄角抛物方程及几何光学双射线模型的计算结果进行比较,说明了这种宽角抛物方程在阻抗边界条件下计算较大仰角电波传播问题是可行的。
Complex-order Fourier Transforms and Their Optical Implementation;
复数阶分数傅立叶变换及其光学实现
Optical Image Encryption Based on Complex-Order Fourier Transform;
复数阶分数傅立叶变换用于光学图像加密
Joint Extended Fractional Fourier Transform Correlator;
联合广义分数傅立叶变换相关器的研究
Research of the Fractional Fourier Transform Applied in Optical Image Processing;
采用分数傅立叶变换的光学图像处理方法研究
The Optical Encryption Technology Based on Fractional Fourier Transform;
基于分数傅立叶变换的光学加密防伪技术
Research on Algorithms of Speech Enhancement Based on Fractional Fourier Transform;
基于分数傅立叶变换的语音增强算法研究
Image Encryption Based on Phase Encoding and Fractional Fourier Transform
基于相位编码及分数傅立叶变换的光学加密
A novel algorithm for image watermarking in fractional Fourier transform domain
分数傅立叶变换域的一种鲁棒性图像水印算法
Airborne SAR Multiple Moving Targets Detection Based on Fractional Fourier Transform
基于分数傅立叶变换的机载SAR多运动目标检测
Measuring Transverse Displacement and Titling of Object by Using the Fractional Fourier Transformation;
分数傅立叶变换(FrFT)在物体的横向位移和倾斜测量中的应用
Study on Multiple Access and Receiving Scheme Using Chirp Signals Based on Frft
基于分数傅立叶变换的Chirp信号多址方式与接收方法研究
Research on Digital Watermarking Algorithm Based on the Fractional Fourier Transform;
基于分数阶傅立叶变换的数字水印算法研究
Image Hashing Based on Fractional Fourier Transform;
基于分数阶傅立叶变换的图像Hash算法研究
Application of FRFT to Moving Underwater Target Detection
基于分数阶傅立叶变换的水下动目标检测
Fractional Fourier tansfor(mFRFT) used in the analogous circuit
分数阶傅立叶变换在模拟电路中的应用
The Algorithm with Image Data Compression of FFT
快速傅立叶变换的图像数据压缩算法
The Digital Filter Design Based on Discrete Fourier Transform
基于傅立叶变换的数字滤波器的设计
Fourier transform infrared spectrometry
傅立叶变换红外光谱法
