1) spectrum leakage
谱泄漏
1.
Then, in order to improve the measurement accuracy with harmonics, it is applied by counteracting the spectrum leakage of data derived from DFT of two data windows which stagger about half period of signal, the same algorithm of measure phasor, tracking of sampling frequency, and measuring again.
首先,对纯基波信号,该算法利用2个数据窗的DFT变换数据推导出了一个关于频率偏移的方程,解此方程后可以求出基波信号的频率、幅值及相位的精确解,在推导过程中无任何近似误差,有效减小计算量的同时提高了测量的精确性;接着,为了提高谐波情况下测量的精度,利用采样起点间隔半个信号周期的DFT变换数据进行谱泄漏抵消;然后用前面的方法进行相量测量,通过跟踪采样频率,进而再次测量;最后,分别对存在谐波和噪声的情况进行了仿真。
2.
The core of spectrum analytical method is FFT,which generally brings spectrum leakage in course of analysis,and affects the precision of distortion measurement.
频谱分析法的核心是FFT,FFT方法进行谐波分析会出现谱泄漏现象,影响失真度的测试精度。
2) spectral leakage
频谱泄漏
1.
The algorithm by weighted for three points of Fourier transformed series alleviated spectral leakage, accuracy of dielectric loss angle calculation in asynchronous sampling was improved, realization of algorithm was easy, and in the meantime, the calculation quantity was only a little more than FFT algorithm.
该算法通过对信号傅立叶变换后所得序列中3个点的加权运算减轻了频谱泄漏,提高了信号频率偏离理想频率时计算所得δ的精确度,且算法简单、计算量少,与FFT非常接近。
2.
The main factor of spectral leakage is conducted when the sampling would be non-synchronous.
首先分析了非同步采样时FFT算法频谱泄漏的主要原因。
3.
The kind of windows has advantages of simple structure, lower attenuation and good inhibition of spectral leakage.
该类窗构造简单,具有旁瓣衰减速率快,更好地抑制频谱泄漏影响等特点。
3) spectrum leakage
频谱泄漏
1.
An improved algorithm for reducing spectrum leakage based on equal angle-interval sampling principle;
一种改进的减少频谱泄漏的等角度间隔采样递推算法
2.
Simulation of software sampling frequency adaptive algorithm for reducing spectrum leakage;
一种减小频谱泄漏的采样频率自适应算法仿真研究
3.
Reduce spectrum leakage based on frequency pursuit;
利用频率跟踪技术减小频谱泄漏
4) frequency spectrum leakage
频谱泄漏
1.
By means of the discrete frequency spectrum, the frequency spectrum leakages of the conventional DFT and the DFT with a Hanning window are comparatively analyzed in this paper.
利用离散频谱详细对比分析了DFT的频谱泄漏和加汉宁窗DFT的频谱泄漏现象,讨论了用异步顺序采样值计算电量产生误差的原因,提出了利用异步顺序采样值精确计算电量的方法,实现了畸变电量的精确测量。
2.
Three factors affecting the performance of the proposed algorithm are analyzed,including signal-noise ratio (SNR),frequency spectrum leakage and group-delay.
采用宽带线性扫频信号作为通道幅相误差校正的测试信号,在采集实际接收机数据的基础上,分析了信噪比、频谱泄漏以及由通道校正滤波器引起的群时延对校正精度的影响。
3.
The restrain method of DFT frequency spectrum leakage base on signal symmetry extension is proposed in this paper, experimental results show that this method is effective.
提出一种利用信号对称拓展技术抑制离散傅立叶变换频谱泄漏的方法 ,实验证明是一种有效的方法。
5) frequency leakage
频谱泄漏
1.
There are difficulties in performing synchronized sampling and integral period truncation in the harmonic analysis of power system with the Fourier transform technique, and the measuring results will be disturbed by the frequency leakage.
傅里叶变换进行电力系统谐波分析时很难做到同步采样和整周期截断,由此造成的频谱泄漏将影响谐波分析的效果;通过加窗和插值可以改善谐波分析的准确度。
2.
The simulation results show that the proposed algorithms can reduce the frequency leakage,decrease the measurement error and improve the harmonic measurement precision.
在Matlab/Simulink环境下的仿真结果表明:该算法降低了频谱泄漏,减小了测量误差,提高了谐波的测量精度。
6) reaction rates
泄漏谱
1.
MCNP/4A code is used to calculate the leakage spectra of D T source from the vanadium sphere and the reaction rates of Al, Fe and Ⅴ foils in the assembly.
用MCNP/ 4A程序计算了钒球 14MeV中子源的泄漏谱及Al、Fe和V在其内的反应率 ,并与实验结果进行了比较。
补充资料：倍频谱带
分子式：
CAS号：
性质：又称倍频谱带。红外光谱分析中的一种谱带；指某个吸收频率为基谐振动频率的2倍或3倍时的吸收带。它的产生是由于两个原子核间的库仑排斥力使振动频率发生了异常变化的结果。泛频带的吸收强度往往很低，因此这个吸收带有时测不出来。
CAS号：
性质：又称倍频谱带。红外光谱分析中的一种谱带；指某个吸收频率为基谐振动频率的2倍或3倍时的吸收带。它的产生是由于两个原子核间的库仑排斥力使振动频率发生了异常变化的结果。泛频带的吸收强度往往很低，因此这个吸收带有时测不出来。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条