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signal covering
相关语句
  信号覆盖
     Research and Practice of Ground Wireliss Signal Covering Metro
     地面无线通信信号覆盖地铁的研究和实践
短句来源
     The Research and Application of a Algorithm in Signal Covering of Blind Area and Searching for the target
     “盲区”内信号覆盖及目标寻找与定位的算法研究与应用
短句来源
     By calculating the Doppler shift and its uncertainty in the signal covering area, the relation between Doppler shift and the position of the receiver is obtained.
     通过对地面卫星信号覆盖区内的多普勒频率偏移及不确定性范围的计算,给出了卫星导航系统信号的多普勒频率偏移与接收机位置之间的关系。
短句来源
     It was put forward the demand analysis, designing principle and technical project of this System, and placed emphasison the next aspects, the composing of the wireless network, the deployment and signal covering of the wireless basic station,the function designing of the wireless terminal and the security solving project of the wireless network.
     提出集装箱中心站无线数据通信系统的需求分析、设计原则及技术方案,重点阐述无线网络的组成、无线基站的部署及信号覆盖、无线终端的功能设计及无线网络的安全解决方案。
短句来源
  “signal covering”译为未确定词的双语例句
     Its difference from other systems is that it has channel relay unit which can communicate with the main trunking system. When the intelligent base station does not communicate with other systems, it can deal with communications and dispatching in its signal covering area.
     智能基站的独特之处在于它增加了与主集群系统(简称主系统)通信的中继信道控制单元,当智能基站不与外界通信时,基站可以独立地完成本系统覆盖区域内的调度通信;
短句来源
  相似匹配句对
     Research and Practice of Ground Wireliss Signal Covering Metro
     地面无线通信信号覆盖地铁的研究和实践
短句来源
     Signal Waveforms
     信号波形
短句来源
     The Summary of the Signal Cover in the Room and the Model Designed for Tunnel Covering
     室内覆盖信号的概述及隧道覆盖的典型设计
短句来源
     Signal processing
     信号处理技术
短句来源
     Trends in Covering
     包覆技术的发展趋势
短句来源
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  signal covering
For an electroencephalographic α-signal, a separation of waves and extraction of additive sub-signals are achieved, each sub-signal covering a well-bounded and physiologically meaningful frequency range.
      
This summation yields a signal covering all the individual samples, with a signal-to-noise ratio which is improved according to the
      
The image also shows a more diffuse Mn signal covering at the TiO2 surface, which indicates also the existence of a manganese dispersed phase.
      
Our watermark is a spatial domain pseudo-random noise signal covering the entire video object.
      
Figure 4 illustrations of the communication range, interference range, and buzzing signal covering range-preventing range.
      


A series of stimulated radiation signals covering from infrared to ultraviolet ranges were generated when atomic ytterbium was pumped to high lying singlet and triplet states with two dye lasers excited simultaneously by a N2 laser using two-step pump. These stimulated lines are from radiative transitions between singlet states, triplet states and singlet-triplet states respectively. The generation processes of these stimulated lines were disscussed in detail.Besides, the ratio of the absorption coefficients...

A series of stimulated radiation signals covering from infrared to ultraviolet ranges were generated when atomic ytterbium was pumped to high lying singlet and triplet states with two dye lasers excited simultaneously by a N2 laser using two-step pump. These stimulated lines are from radiative transitions between singlet states, triplet states and singlet-triplet states respectively. The generation processes of these stimulated lines were disscussed in detail.Besides, the ratio of the absorption coefficients between singlet states and singlet-triplet states, and that of probability of collision energy-transfer were measured.

用一台氮分子激光器同时泵浦两台染料激光器,以两步激发的方式,分别将稀土镱原子激发至高位单重态和三重态.由此获得了一系列范围从红外到紫外的受激辐射信号。这些受激辐射分别来自单重态的跃迁、三重态间的跃迁以及单-三重态间的辐射跃迁。文章对这些受激辐射的产生过程进行了详细的讨论。此外还测定了单重态和单-三重态间的吸收系数之比以及能级间的碰撞转移几率之比。

In the satellite navigation and positioning system, Doppler shift is one of the key problems that may degrade the performance of the satellite receiver. By calculating the Doppler shift and its uncertainty in the signal covering area, the relation between Doppler shift and the position of the receiver is obtained. Quantitative analysis of Doppler uncertainty range is derived. A method for compressing Doppler uncertainty is presented.

在卫星导航定位系统中,多普勒频率偏移是影响接收机性能的关键因素之一。通过对地面卫星信号覆盖区内的多普勒频率偏移及不确定性范围的计算,给出了卫星导航系统信号的多普勒频率偏移与接收机位置之间的关系。对多普勒不确定范围做了定量分析,提出了压缩多普勒不确定范围的方法。

A method of feature auto-extraction in the rolling element bearing fault diagnosis based on wavelet packet analysis and envelope detection is presented. Firstly, on the basis of the nature that the fault impacts in the rolling element bearing can cause the machine structure to ring at its resonant frequencies, the high-frequency resonance frequency-band is auto-identified from the vibration spectrum computed using an FFT algorithm. Secondly, through wavelet packet analysis, the bearing vibration signals...

A method of feature auto-extraction in the rolling element bearing fault diagnosis based on wavelet packet analysis and envelope detection is presented. Firstly, on the basis of the nature that the fault impacts in the rolling element bearing can cause the machine structure to ring at its resonant frequencies, the high-frequency resonance frequency-band is auto-identified from the vibration spectrum computed using an FFT algorithm. Secondly, through wavelet packet analysis, the bearing vibration signals are decomposed into a series of time-domain signals, each of which covers a specific octave frequency band. The signals covering the high-frequency resonance frequency-band are automatically extracted and reconstructed. Finally, envelope rectification is applied to the reconstructed signals in order to realize feature auto-extraction for rolling element bearing fault diagnosis. From the analysis results of the actual vibration signals, the proposed method is proven to be efficient in detecting and diagnosing the rolling element bearing faults.

提出基于小波包分析和包络检测的滚动轴承故障特征信息的自动提取方法。根据滚动轴承的故障冲击能激起轴承座或其他机械零部件产生共振的特性 ,对轴承振动信号进行快速傅里叶变换FFT分析 ,在频谱图中自动识别高频共振频带。然后利用小波包分析可以在全频带内把信号分解到相邻的不同频带上的特性 ,对滚动轴承的振动信号进行小波包分解 ,自动提取共振频带上的信号并进行重构。最后 ,对重构后的信号进行包络检波 ,实现滚动轴承故障特征信息的自动提取。通过对实际滚动轴承振动信号的分析 ,发现这种方法能非常有效地检测和诊断滚动轴承的故障。

 
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