频率调制

Frequency modulation and amplitude compensation of interruptedly received LFM signals are studied to precede a false target group based on interrupted T/R jamming system.

摘要该文基于间歇收发干扰体制，研究了通过对间歇采样LFM信号的频率调制和幅度补偿，产生导前假目标群问题。

Through proper adjustment to frequency modulation amplitude,the Kerr-effect-induced bias can be effectively reduced.

通过适当调节两光束的频率调制幅度，可有效地实现克尔效应误差的消除。

Vortex folwmeter ; optical-fiber ; light-frequency modulation ; vortex shedder

涡街流量计；光纤；光频率调制；涡街发生体

We studied the bichromatic electromagnetically induced transparency in our new MOT system. The dispersive curve of bichromatic EIT was measured by frequency-modulation spectroscopy.

在新实验系统上进行了双色电磁诱导透明实验，利用频率调制谱的方法测量了双色EIT的色散曲线。

The test results show that the proposed method can effectively compensate even for rapid TID and has good adaptability for different ionospheric frequency modulations.

测试结果表明，该方法能有效地补偿快速的TID污染，并且对不同电离层频率调制具有良好的自适应性。

In the pulse width, frequency modulation, the realization of the flow, pressure control, it can be quickly opened, the use of turn-off.

在脉宽、频率调制下，实现对流量、压力的控制，也可作快速开启，关断使用。

In this optical module, the single-mode oscillating light source outputs a single-mode, frequency-modulated signal.

在这种光学模块中，单模振荡光源输出单模频率调制信号。

The objective of this thesis mainly focuses on the discussion of deviation in topographic height measurement measured by the frequency-modulated atomic force microscopy as the electrostatic force is applied or not applied.

本论文主要是探讨静电力对频率调制原子力显微镜表面高度量测时所造成的误差。

In Chapter 1, it introduces atomic force microscopy as a widely used tool in surface measurement and how electrostatic force effects the deviation in measurement using the frequency-modulated atomic force microscopy during the research.

第一章先介绍已被广泛应用在表面量测的重要工具─原子力显微镜，再介绍先前文献对静电力造成频率调制原子力显微镜量测误差之研究。

At the first step, time-frequency distribution (spectrogram or pseudo Wigner-Ville distribution) of the time-varying signal is adopted and a peak-tracking scheme is designed to obtain a coarse ionosperic modulation estimation from the time-frequency distribution.

在第一步校正中，首先分析这种时变信号的时频分布，并设计了一种谱峰追踪方法从时频分布中获得粗糙的电离层频率调制估计。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。