频率分辨率

分析表明我们有可能从足够高的频率分辨率的p模式振荡的功率谱观测资料中找到g模式振荡的。

Analysis shows that it is possible for us to use high frequency resolution p-mode power spectrum data to search solar g-modes .

最后，对DFT频率分辨率定义进行了扩展和修正。

Some extension and modification of the frequency resolution are presented at last .

结合大量反复的仿真试验，说明了改进后的三种MUSIC方法能够进一步提高MUSIC方法的频率分辨率及抗噪声性能，并且提高了短时数据和较低的自相关阵维数情况下频率估计的准确性。

With large numbers of emulational experiment , it proves the new method can provide better resolution , noise immunity and stability for frequency estimation than traditional MUSIC method .

测不准原理表明：ΔT·Δf≥1/4π，即在一次谱分析中，时间分辨率和频率分辨率不能同时达到高分辨率！

Uncertainty Principle points out that , which means that high time resolution and high frequency resolution can not be obtained both at the same time in spectrum analysis .

频率分辨率是数字信号处理课程教学中一个重要的概念，因为它决定了DFT参数的选择。

The frequency resolution is an important concept in the digital signal processing teaching , because it effects the DFT parameter choice .

详细分析了应用FFT算法时对非时限信号进行截断产生的窗效应对信号谱分析的影响，包括频率分辨率、泄漏效应和窗的恢复系数等方面。

Secondly , the influence that caused by window effect , including frequency resolution , leakage effect and resume coefficient of the window function are discussed .

首先由海洋表面流散射回波Doppler谱的频率分辨率出发分析了海洋表面流的分布式特性，表明海流应该被视为分布源模型。

First the Doppler resolution of the scattered echoes is utilized to analyze the distribution characteristics of ocean currents , which shows that the ocean currents should be treated as distributed models .

在此基础上分析了DFT参数选择对频率分辨率的影响，特别区分了频率分辨率和可视分辨率两个概念，并例证了所得结论。

This paper also distinguishes between the concepts of frequency resolution and visual resolution . It finally proves the conclusion reached with an example .

简单的FFT就能够直接对振动信号进行频谱分析，但是其频率分辨率较低。

The simple FFT can be directly used to analyze the frequency for the vibrational signal , but the defect of the simple FFT is lower resolution .

从理论上计算各个参数的设置范围，并且证明小波变换方法比FFT方法有较高的频率分辨率。

Calculates the setting range of each parameter in theory , and proves the method of wavelet transformation has higher frequency resolution than the method of FFT .

基于DDS技术的数字波形发生器具有频率分辨率高、稳定性好、可灵活产生多种信号的优点。

Digital waveform generator which use DDS ( Direct Digital Synthesize ) technology has many merits like high frequency resolution , good stability and easy to generate signal .

短时傅立叶变换由于受Heisenberg测不准原理限制，时间分辨率和频率分辨率不可能同时达到最佳。

Limited by the theory of Heisenberg , short-time FFT can 't get optimal time resolution and frequency resolution at the same time .

仿真研究结果表明，在短数据情况下，相对FFT分析技术而言，该方法频率分辨率更高，故障检测更为准确，且计算量小，有利于电机故障实时状态监测。

Compared with FFT analysis method , it is higher in resolution of frequency , more accurate in fault detection and less in computational complexity , which is useful in real-time monitoring .

该方法克服了SFT（短时Fourier变换）分析对高、低频段具有相同的时间分辨率和频率分辨率的缺点，弥补了小波变换只能粗糙地模拟基底膜带通滤波器特性的不足。

The time frequency analysis remedies the defect that short Fourier translation ( SFT ) has the same time resolution and frequency resolution to different frequency ranges .

而现代谱估计中的Prony算法理论又具有较高的频率分辨率，能分离出各频率分量。

Modern spectral estimation algorithm of Prony in theory but also has higher frequency resolution , to isolate the various frequency components .

它具有频率分辨率高（可达uHz）、频率转换时间短（可达ns）、输出频率带宽很宽、程控灵活等优点，并具有产生多种常用波形的能力。

It has the advantages of fine frequency resolution , short frequency conversion time , wide modulation bandwidth and controlling facility , and has capability of generating the different waveforms .

然后以VHF波段信号检测为例，研究如何设置小波参数来提高频率分辨率，并用Matlab来仿真射频信号。

Then taking the signal detection of VHF wave band for example , studies how to setting wavelet parameter to improve resolution of high frequency and using Matlab to simulate RF signal .

并且克服了时域法要求对QRS复合波的起点和终点准确定位不易的缺点，以及频域分析法频率分辨率不足的缺陷。

The advantage of this method is that it doesn 't require locating accurately the end point of QRS wave of HRECG and overcomes low resolution of frequency-domain analysis .

由于系统采用具有高频率分辨率的PWM（脉宽调制）变频电源以及恒最大转矩的控制方式，使整个碳纤维生产线能在低速条件下稳定运转。

The results showed that ( PWM ) PCS could meet all of the requirements for rayon carbon fiber production line , since the control system had contravariant PWM , high FC power resolution and maximum twisting moment .

它可以将DDS的超高频率分辨率、高频率精确度、容易实现程控等优点与锁相环良好的窄带跟踪滤波特性相结合。

The merits of DDS such as super fine frequency resdutlon 、 high frequency accuracy 、 easy programmed can be in combination with the excellent character of narrow-band tracing filter merits of PLL .

与传统的FFT相比极大熵谱法具有频率分辨率高，适于短时瞬态数据处理，而且能给出振动幅值与频率和时间三者的关系。

Compared with traditional FFT method , MESE not only has higher resolution but also fits the processing of transient data , so , it can show the relation of amplitude to both time and frequency .

直接数字合成（DDS）简单可靠、控制方便，具有很高的频率分辨率，高速转换，非常适合快速跳频的要求。（3）高显著度。

Direct digital synthesis ( DDS ) is simple , trusty and controlled conveniently with the features of high-speed switching and higher resolution , it also adapts to the requirement of high-speed frequency-hop system .

无人机的测控系统要求数控振荡器（NCO）的频率分辨率高、相位噪声低、杂散小。

In the UAV telemetry & control system , it is required that the numerical control oscillator ( NCO ) having high frequency resolution and small spurious signal .

直接数字合成器（DDS）具有较高的频率分辨率，可以实现频率快速切换，并且在频率改变时能保持相位的连续，很容易实现频率、相位和幅度的数字调制。

Direct Digital Synthesizer ( DDS ) has high frequency resolution which may realize the frequency fast cut , maintain the phase continual and be very easily to realize digital modulation of frequency , phase and amplitude .

DDS系统可以很方便地获得频率分辨率很精细且相位连续的信号，也可以通过改变相位字改变信号的相位，因此也广泛用于数字调频和调相。

By using the DDS system , we can obtain signals with high definition in frequency and with sequential phase . Meanwhile we can acquire digital FM signals and PM signals by means of changing the phase word .

利用Altera公司Cyclone系列芯片采用线性插值法进行设计实现与仿真，并且很方便地实现线性调频信号（LFM）的产生；它具有较高的频率分辨率、频率转换速度快以及相位噪声低等优点。

In the design implementation and simulation , the Altera Cyclone FPGA device is utilized and the linear interpolation algorithm adopted , then the linear frequency modulation ( LFM ) signal can be easily generated .

提出了一种用线性调频Z变换进行频谱校正的新方法，通过提高局部频段内的频率分辨率解决离散谱线不能对准实际谱峰时所带来的误差。

A new spectrum correction method based on Chirp Z Transform is presented , by which the frequency resolution can be increased according to users ' requirements and thus a richer spectrum can be obtained and more accurate spectrum peaks can be found .

而根据Heisenberg原理（测不准原理），信号的时间分辨率和频率分辨率是一对矛盾量，不可能同时得到任意高的时间分辨率和频率分辨率。

According to Heisenberg principle ( uncertainty principle ), the signal time resolution and frequency resolution is a contradiction volume , they can not simultaneously achieve arbitrary high time resolution and frequency resolution .

连续记录100～240s的脑电，取1s为1个时间段进行FFT变换，采样率256Hz，频率分辨率1Hz。

The continuous 100-240 seconds EEG data were segmented into 1 second epochs for FFT transform ( sampled at 256 Hz , 1 Hz frequency resolution ) .

理论分析与仿真结果均表明，WCF在各频段都具有相同的频率分辨率，并能够检测子频带交界处的频率分量。

Theoretical analysis and simulation results show that the novel WCF has identical frequency resolution in all frequency bands , and can detect the frequency components on the cross points of neighboring subbands .