频率域

空间域算法通常简单易实现，但抗攻击性不强.频率域算法较空间域算法稳健性要好。

Spatial domain algorithm is usually easy to achieve , but do not have a strong anti-offensive . Frequency domain algorithm is better than the spatial domain algorithm in stability .

在Matlab环境下对算法进行了模拟实验，实验主要从空间域和频率域两个方面验证，攻击方式主要考察了与攻击和随机选择攻击。

The algorithm has been simulated in the Matlab environment . The experiments mainly validate from the spatial domain and frequency domain .

用MATLAB计算机语言编制了一套基于有限单元法的频率域激电参数的正演模拟程序。

Using the MATLAB computer language , complete a set of program of forward simulation based on FEM .

MIMO系统的循环频率域分离辨识方法

MIMO System Identification Based on Cyclic Domain Separation

本文借用频率域方法，求得浮体运动附加质量和阻尼系数关于频率ω从0到∞的变化特性，通过Fourier变换将频域解转化为时域解。

In this paper , the time domain solution is obtained by Fourier transform of frequency domain results .

利用安徽省测震台网记录到的中小地震P波记录，采用频率域方法，测定了本省区域范围内1985－1995年间地壳介质的Q值。

Made use of the frequency method and the P-wave information of medium and small earthquakes recorded by the seismic network in Anhui province .

利用Fourier变换将空间域位场数据变换到频率域进行谱分析是重力位场数据处理中的一种重要方法。

It is an important method that the potential field data is analyzed in the frequency domain using Fourier transform .

基于速率控制的MPEG-2视频频率域转码及其硬件实现

MPEG-2 Video Transcoding Method in DCT Domain Based on Rate Control

具有热带亲缘关系；在频率域内，变化过程大致可划分为三个区域：I.线性区；

It has affinities with that of tropics although it situated in the area of holarctic region . linear region ;

通过Hilbert变换来实现频率域干涉光谱信号的在线归一化，使归一化过程不受光源光谱形状以及谱峰位置变化的影响。

The online normalization of the interference spectrum in frequency domain is implemented with Hilbert transform .

不同尺度地形的SH波频率域响应特征研究

A study on frequency responses of topography with different scales due to incident SH wave

这个局部裂步Fourier传播算子是由相空间（空间-波数）-频率域的相移算子和空间-频率域的窗口时移算子两部分组成。

The local split-step Fourier propagator consists of a phase shift operator in phase-space-frequency domain and a windowed time shift operator in space-frequency domain .

设计了在频率域电法勘探中发送机与接收机GPS时间同步电路，实现了多频激电仪接收机与发送机的精确时间同步进行高精度相位测量。

The frequency domain electric transmitter and receiver synchronization electrocircuit has been designed . It is concluded that the GPS time synchronization is feasible in this instrument .

利用systemgenerator开发工具在Matlab/Simulink环境下对基于频率域的反馈水平因子测量算法进行系统级的建模。

Apply System Generator , a kind of design tool for FPGA , to establish the system-level hardware model of the measurement algorithm based on the frequency domain of C factor in the Matlab / Simulink circumstance .

嘉陵江三江汇合区段的沙量平衡及控制三峡水库泥沙措施探讨在频率域内，变化过程大致可划分为三个区域：I.线性区；

Sediment balance of Three-river confluent region in the Jialing River and measures to control sediment entering the Three-Gorge Project reservoir linear region ;

同时在频率域内探讨了纵横波的主频、带宽、品质因素Q随不同含气饱和度的变化。

At the same time , the changes of main frequency , frequency band and quality factor with the variations of gas saturation are analyzed .

通过求解Helmholtz方程，推导出频率域的逆时偏移方法。

By solving the Helmholtz equation , reverse-time migration method in frequency domain is derived .

一种方法是直接将高阶滞后对象在频率域内降阶为低阶滞后对象，针对低阶滞后对象设计预测PI（D）控制器；

The first method is that the predictive PI ( D ) controller is designed by a low order model reduced directly from the process model .

实验表明在频率域提取纹理特征Gabor小波的方法优于在空间域利用共生矩阵提取纹理特征的方法。

Experiments show that the frequency method as Gabor wavelets is better than the method which extract texture feature in space .

利用频率域模型降阶理论，提出了高阶时滞对象的预测PI（D）控制器两种设计方法。

Based on the model reduction theory in frequency-domain , two predictive PI ( D ) controller design methods for high order processes with time-delay are proposed .

通过考察复数图像数据的特性提出了在消除频率域冗余的基础上使用块自适应量化的SAR复数图像压缩算法。

By examining the characteristic of complex image data , this paper presents an efficient compression method based on block adaptive quantization ( BAQ ) after removal of frequency redundancy .

利用Gabor滤波器增强掌纹线特征方法，将掌纹图像分割成若干子块并将子块变换到频率域。

The Gabor filter palm-print line feature enhancement method is adopted to divide the palm-print into some sub-blockes and transform the sub-block into frequency area .

频率域电磁法EH-4系统在铁路隧道勘察中的应用

Application of Frequency-Domain Electromagnetic Sounding in the Railway Tunnel Exploration

用交错网格有限差分法（SFD），实现了三维频率域电磁场响应的数值模拟。

In this study , the staggered-grid finite difference method is used to simulate the three dimensional electromagnetic responses .

通过对一种新的一维频率域重叠数字滤波器的理论分析，找到了对应的FIR滤波器模型和线性相位的满足条件。

In this paper , by analysis of a novel 1 dimension overlapping digital filter in frequency domain , the corresponding model of FIR filter and the condition for linear phrase are presented .

先在频率域中确定造波机的运动形式，并在时间域中模拟摇板运动生成带有波前的高品质Stokes波的过程，作为入射波条件。

A special wave maker motion mode was determined by analysis in the frequency domain and simulation in the time domain to generate Stokes waves with second order accuracy .

通过理论分析和计算，我们发现利用Fourier投影定理在频率域计算τ-p变换不仅精度高，假频干扰轻，而且计算速度比在时-空域实现要快许多。

We have found from theoretical analysis and computation that τ - p transform using Fourier projection theorem in frequency domain brings higher accuracy , less aliasing and much faster computational speed than that in time-space domain .

通过对图解方法的分析，提出了逆Nyquist阵对角占优的解析判别式，简化了多变量频率域鲁棒性分析和设计。

To decrease the complexity of frequency-response-based analysis and design , based on graphics method of inversion Nyquist array , an approximate criterion is developed .

工程中常用电磁勘探方法有三大类：探地雷达方法（GPR），时间域电磁法（TEM），频率域电磁法（FEM）。

There are three major categories of electromagnetic exploration methods commonly used in engineering : ground-penetrating radar method ( GPR ), time domain electromagnetic method ( TEM ), frequency domain electromagnetic method ( FEM ) .

其频率域分析结果表明，该处物质积累速率具有7a和3a的准周期变化。

The analysis of freqency domain of the series shows that there exist both 3-year and 7-year 's quasi-cycles of accumulation rate .