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调制特征     
相关语句
  modulation features
     Automatic classification of aircraft based on modulation features
     基于调制特征的飞机目标自动分类
短句来源
     This article makes a simulation analysis of the ideal modulated returns under the four conditions of various attitude angles, the number of rotating blades, the rotation speed and the various radar wavelength, which shows that the periodical modulation features are relatively stable and can be available for the identification of aircraft targets.
     本文在不同的姿态角、不同的旋转桨的个数、不同的旋转速度和不同的雷达波长四种条件下,对飞机旋转部件的理想调制回波进行了仿真分析。 仿真结果表明回波中的这种调制特征是相对稳定和不变的,可以用于目标识别。
短句来源
  modulation feature
     A Method for Modulation Feature Extraction of Underwater Target Radiated Noise
     一种水下目标辐射噪声调制特征提取方法
短句来源
     The Modulation Feature Analysis of Ship Radiated Noise based on Wavelet Transform
     基于小波变换的舰船辐射噪声调制特征分析
短句来源
     Modulated signal of underwater target radiated noise contains much important feature information. According to modern signal processing theory,a method for modulation feature extraction of the radiated noise is discussed.
     水下目标辐射噪声的调制信号携带许多重要特征信息,本文在现代信号处理理论的基础上对其调制特征提取方法进行了探讨。
短句来源
     With the spectra of digital modulated signal and its non-linear transform being analyzed,two new modulation feature parameters are proposed and descriptions of another two features are modified. Then a novel identification scheme is obtained,capable of blind identification of many commonly used digital modulations in AWGN,using a neural-network-ensemble-classifier.
     通过分析数字调制信号及其非线性变换的功率谱,提出了两个新的调制特征参数,改进了两个相关特征的描述,设计了一种采用神经网络集成结构分类器的识别方案,实现了AWGN信道下常用数字调制信号的自动识别.
短句来源
  modulation characteristics
     According to the modulation characteristics of roller bearing fault vibration signals, the limitation of the traditional envelope analysis and the situation that it is hard to obtain enough fault samples, a roller bearing fault diagnosis method based on Support Sector Machine(SVM)and Empirical Mode Decomposition (EMD) envelope spectrum is proposed in this paper.
     针对滚动轴承故障振动信号的调制特征和传统包络分析法的缺陷以及现实中难以获得大量典型故障样本的实际情况,提出了一种基于支持向量机(Support Vector Machine,简称SVM)和经验模态分解(Empirical Mode Decomposition,简称EMD)包络谱的滚动轴承故障诊断方法.
短句来源
  modulation signature
     A method for intra-pulse modulation signature analysis of radar signals
     一种雷达信号脉内调制特征分析方法
短句来源
     In order to extract the modulation signature for target recognition from aircraft returns in a conventional radar (CR), some parameter models of the returns of aircraft including helicopters, propellers and turbojets, are proposed in this paper based on a modulated mechanism.
     为了从常规雷达回波中提取用于飞机目标识别的调制特征,依据雷达回波调制特征产生机理,推导了常规雷达直升机、螺旋桨飞机和涡扇喷气飞机回波调制特性的参数模型。
短句来源

 

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  modulation features
The modulation features have two major advantages compared to the linear MFCC features.
      
  modulation feature
The evolution of each modulation feature can be tracked in these images.
      
  modulation characteristics
The calculations have been performed by the finite difference method, and modulation characteristics of vector potential components have been determined.
      
The modulation characteristics are found to be significantly affected in the presence of a strong sum-frequency signal that builds up proportionately to the input probe field.
      
For determining the optimum conditions of detecting the signal during acousto-optic visualization, the modulation characteristics of radiation of a laser beam crossed by a focused acoustic beam in a medium and scattered by this medium were studied.
      
The switching and modulation characteristics of fullerene-containing polymer-dispersed liquid crystal structures involving fullerene complexes with magnesium phthalocyanine nanocrystals are studied for the first time.
      
The system's modulation characteristics are studied.
      
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  modulation signature
In particular, the DAMA/Nal setup (?100 kg of highly radiopure NaI(Tl)) has effectively investigated the model-independent annual modulation signature over seven annual cycles (total exposure of 107 731 kg day), obtaining 6.3σ C.L.
      
In particular, the DAMA/NaI setup ( ? 100kg highly radiopure NaI(Tl)) has effectively investigated the model-independent annual modulation signature; the data of seven annual cycles (total exposure of 107731kg × d) have offered a 6.3σ C.L.
      
An investigation of the WIMP annual modulation signature is in progress at the Gran Sasso National Laboratory of the I.N.F.N.
      
Investigating halo substructures with annual modulation signature
      
  其他


Amplitude modulation and frequency modulation are a common sight in rotating element bearing and gearbox vibration signals. Modulated phenomena differentiation and analysis have been used extensively in machinry vibration monitoring and diagnosis. The WignerVille distribution, a popular technique of signal time-frequency analysis, has provided a very effective way to distinguish this phenomena. This paper puts forward several methods to solve the practical problems which are present in the applications of the...

Amplitude modulation and frequency modulation are a common sight in rotating element bearing and gearbox vibration signals. Modulated phenomena differentiation and analysis have been used extensively in machinry vibration monitoring and diagnosis. The WignerVille distribution, a popular technique of signal time-frequency analysis, has provided a very effective way to distinguish this phenomena. This paper puts forward several methods to solve the practical problems which are present in the applications of the Wigner-Ville distribution and inquires into the Wigner-Ville distributions of modulating signals through digital simulations. Finally, a practical example is given.

幅值调制和频率调制在滚动轴承和齿轮箱振动信号中是常见的现象,调制特征的识别和分析已广泛应用于机械振动监测与故障诊断.时额分析的Wigner-Ville分布为识别这类调制现象提供了一种十分有效的分析途径。本文针对Wigner-Ville分布中存在的实际问题结合应用提出了一些解决办法,并通过仿真分析探讨了调制信号的Wigner-Ville分布特征,最后给出了一个应用实例.

Polycrystalline samples of Bi\-\{1.8\}Pb\-\{0.2\}Sr\-2Cu\-\{1- x \}Fe\- x O\- y , Bi\-\{1.8\}Pb\-\{0.2\}Sr\-\{1.6+ x \}La\-\{0.4- x \}Cu\-\{1- x \}Fe\- x O\- y have been studied by means of X ray diffraction, ED patterns, Raman scattering and resistivity. Experimental results show that the characteristic of modulation structure of Bi2201 system does not depend on the amount of the extra oxygen. The phonon frequencies of O\-\{Sr\} mode around 625 cm\+\{-1\} can be influenced by “charge transfer”...

Polycrystalline samples of Bi\-\{1.8\}Pb\-\{0.2\}Sr\-2Cu\-\{1- x \}Fe\- x O\- y , Bi\-\{1.8\}Pb\-\{0.2\}Sr\-\{1.6+ x \}La\-\{0.4- x \}Cu\-\{1- x \}Fe\- x O\- y have been studied by means of X ray diffraction, ED patterns, Raman scattering and resistivity. Experimental results show that the characteristic of modulation structure of Bi2201 system does not depend on the amount of the extra oxygen. The phonon frequencies of O\-\{Sr\} mode around 625 cm\+\{-1\} can be influenced by “charge transfer” effect and the variation of modulation structure. Crystal microstructural characteristic play an important role in influencing superconducting transition temperature and transport properties.

利用X光衍射,电子衍射,Raman散射和电阻率等手段对多晶样品Bi1.8Pb0.2Sr2Cu1-xFexOy,Bi1.8Pb0.2Sr1.6+xLa0.4-xCu1-xFexOy的结构和性能进行了研究.结果表明:Bi2201体系的调制特征与额外氧的多少无关,625cm-1附近的Raman峰受‘电荷转移’效应和调制结构变化的显著影响,晶体的微结构变化强烈影响体系的超导电性和输运性质.

Some novel methods to get the optical pulses at repetition rate (f p) integer multiples of the RF drive frequency in actively harmonic mode locked erbium doped fiber laser (AHML EDFL) are reported. The character of the nonlinear modulation is analysed. The mechanism of high repetition rate pulses generated from AHML EDFL in particular, the influence of modulation degree on pulse train are discoussed.

分析了 L i Nb O3 电光强度调制器的非线性调制特征 ,论述在主动谐波锁模掺铒光纤环形激光器 (AHML- EDFL)中利用该调制器的非线性来获取高阶锁模脉冲的物理机理和调制方法。在实验上 ,通过多种非线性调制手段 ,从 AHML- EDFL中获取了分频 ,2阶 ,3阶等高阶锁模脉冲序列。

 
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