基本解释：射频谱学
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Combined with the features of virtual instrument, the scheme realizing virtual RF spectrum analyzer is presented and realized in this paper, and digital intermediate frequency method is emphasized.结合虚拟仪器的特点 ,提出并实现了一种虚拟射频频谱仪的方案 ,着重介绍了其中的中频数字化实现方法。
The beam parameters can be calculated accurately by the mode field distribution of the waveguide, or by the diffraction frequency spectrum distribution in far field which is measurable exactly in the experiment.对于傍轴光束 ,提出了介质平面波导衍射场的近场模场半宽度、远场发散角半宽度和光束传输因子M2 等光束参量之间满足简单的关系式 ,三个光束参量均可直接由波导模式场分布精确计算 ,或由可实际精确测量的远场衍射频谱分布精确计算。
Any A/D sampling is a spectrum mapping from the original signal to bandpass sampled signal.文章建立了对任意A/D采样(包括欠采样与过采样)都有效的频谱映射一般公式,提出无混迭带通A/D采样速率f_s的2个等效准则,以便在随信号调整f_s情况下的应用。
Design and Research on RF Virtual Frequency Spectrum Analyzer Based on Digital Intermediate Frequency;基于中频数字化的虚拟射频频谱分析仪的设计与开发
solar radio dynamic spectrograph太阳射电动态频谱仪
The Simulation and Frequency Spectrum Measurement on the Key Circuit of RF Front-End;射频前端关键电路的模拟与频谱测量
Low-frequency characteristic of ultrasound reflection spectrum from adhesively bonded aluminum plates等厚铝板粘接件超声反射频谱的低频特征
video frequency/IF/RF pre-correction视频、中频、射频预校正
d spectral analysis夫琅和费衍射和频谱分析
Decrease electron-magnetic radiation by using spread-spectrum-clock generation technique采用扩展频谱时钟技术降低电磁辐射
swept IF type spectrum analyzer扫中频式频谱分析仪
spectral density谱线[频谱，光谱]密度
radio-frequency carrier射频载波, 高频载波
2.4GHz CMOS Zero-IF Receiver;2.4GHz CMOS零中频射频接收机
an isolated component of a spectrum formed by radiation at a uniform frequency.在均匀频率下辐射光谱的一个孤立成分。
Research on selective optical amplification of Brillouin spectrum of weak scattering signals in water水中微弱光散射布里渊频谱选择性光放大研究
Determining Biological Effects of Mobile Phone Radiation on MCF-7 Cells by Proteomics Analysis Approach;射频电磁场对细胞蛋白质表达谱的影响
Mass Spectroscopic Diagnosis of Plasma Space Properties in Radio Frequency Glow Discharge;射频辉光放电等离子体空间特性的质谱诊断
The Investigation on Dual Frequency Capacitively Coupled Plasma by Using Optical Emission Spectroscopy双频容性耦合等离子体特性的发射光谱研究
The Development of Transceiver for Magnetic Resonance Imaging Spectrometer核磁共振成像谱仪射频收发系统的研制
The Research on Early Radiation Induced Hepatic Injury in Vivo with High-energy X-ray早期放射性肝损伤的电阻抗频谱特性研究
