transmission frequency

The results indicate that, under the thermal noise approximation, the measurement accuracy of Brillouin frequency shift is dependent on thermal noise, the derivative of the transmission function of the edge optical filter and the power of Brillouin scattering optical signal.

结果表明，在热噪声近似下，布里渊频移测量精度与热噪声、边缘光滤波器透射函数的导数及布里渊散射光信号功率有关。

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It has a rather high transmission frequency and low attenuation.

居有较高的传输频率和较低的衰减.

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Mouse using-high frequency 2.4 ghz wireless transmission technology, operation to receive up to 10 meters distance.

鼠标采用超高频2.4ghz无线传输技术, 操作接收距离长达10公尺.

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Research on test methods in frequency domain on the basis of transmission line

长线频域测试法研究

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However, the received performance of HF/ VHF communications is directly affected by Doppler frequency shift, which caused by transmission characteristics including terminal movement, fading, multi-path effects and other factors, thereby needs to be estimated accurately and compensated real-timely.

但是系统中终端的移动、衰落和多径效应引起的多普勒效应会严重的影响到接收性能。因此，准确实时的多普勒频移估计与补偿技术对于短波/超短波通信来说尤为重要。

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This paper treats of frequency stability of conventional 12-channel carrier transmitters as used in collieries, with particular reference to the considerable variations of underground transmission line impedance and fluctuations of supply voltage.

本文根据煤矿井下载波传输线路阻抗变化大、电源电压波动大的特点，针对传统的矿用十二路载波发射机，讨论了其振荡频率（即发射频率）的稳定性问题。

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Microwave circuits differ from lower frequency circuits in ground connection , interconnect and manufacturing the transmission lines.

微波电路与低频电路的不同主要在于接地, 互连与微带线的制造.

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Orthogonal frequency division multiplexing ( OFDM ) is a special multi-carrier transmission technology.

正交频分复用 ( OrthogonalFrequencyDivisionMultiplexing, OFDM ) 是一种特殊的 多载波 传输技术.

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Design a kind of intellectualized instrument, which can automatically measure power frequency parameters power transmission line.

研究设计了一种能自动测量输配电线路工频参数的智能化仪表.

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Particularly introduces the measure theory of frequency and phasic dispersion, A/ D conversion, and gives the system ′ s power supply, then discusses several data transmission methods: RS 485, CAN, and GPRS communication.

详细介绍了频率、相位差的测量原理和A/D转换，以及系统所需电源的电路设计。并且讨论了几种数据传输的方式：RS485通信、CAN通信及GPRS通信。

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