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- frequency shift signallling 移频发信
- According to the laser gain change is linear related to the frequency shift, the Doppler frequency is extracted by the signal processing. 根据激光的增益变化和频率变化成线性关系,可以对信号进行处理求出多普勒频移。
- Signal demodulation of automatic block with audio frequency shift modulated track circuits was implemented with phase-locked loop( PLL) technique and a singe chip microcomputer. 利用锁相环(LL)窄带跟踪特性;与单片机结合;实现自动闭塞系统移频信号解调.
- Then after amplitude limiting, to be preamplified, demodulated, bandpass filtered, the doppler frequency shift signal is extracted. 经过限幅保护,接收放大,检波和带通滤波后,将多普勒频移信号提取出来。
- Massively uses the frequency Shift Keying Signal(FSK) in our country locomotive control signal to transmit each kind of locomotive speed information. 摘要 在我国机车控制信号中大量采用移频键控信号(FSK)来传送各种机车速度控制信息。
- Based on the discussion of the topological structure of a superheterodyne FM receiver, a one chip FM receiver for FSK(Frequency Shift Keying) signal has been designed. 在分析超外差 FM中频接收拓扑结构的基础上 ,设计出一种用于 FSK(移频键控 )信号的单片FM中频接收电路系统。
- This paper concerns relative technologies about carrier frequency synchronization and estimation in downlink signal in large doppler frequency shift condition. 本文对大多普勒频移情况中,下行信号载波频率同步估计的相关技术进行了研究。
- On the base of reducing the problem, this paper put forward the idea improving bonding circuit to automatic block with audio frequency shift modulated track circuit and other signal equipmemt on the Hu Hang and Zhe Gan line. 在减少自动闭塞初期故障的基础上,对沪杭、赣线移频自动闭塞与其他信号设备的结合电路,提出了改进意见和实施措施。
- The earth's rotation and its motion around the sun add an appreciable frequency shift. 地球自转与地球绕日公转产生附加的频移。
- The factors affecting on the measurement accuracy of Brillouin frequency shift are analyzed, the relation between the measurement of Brillouin frequency shift and signal to noise (SNR) is obtained. 分析了影响布里渊频移测量精度的因素,给出了布里渊频移测量精度和信噪比的关系。
- The Brillouin frequency shift can be precisely measured by changing the local frequency and adopting narrow filter. 通过改变本地电信号的频率对信号进行扫描和窄带滤波,从而实现了布里渊频移的精确测量。
- The scheme of measuring Brillouin frequency shift in fiber sensor based on edge optical filter is proposed. 提出了采用边缘光滤波器来测量光纤传感中布里渊频域的方案。
- The results show,the light frequency shift can be effectively r educed in the sharp angle laser light pumping scheme. 结果表明斜光抽运方案可以有效降低铯原子束频标中的光频移。
- This paper describes the design and the test results of Gaussian frequency shift keying for bluetooth. 介绍了一种用于蓝牙芯片的高斯滤波移频键控的设计和测试结果。
- Pilot beacon devices are available in the frequency shift and demodulation modes. 飞行员烟火装置在频度变化和解调模态中是可得的。
- Objective To discuss the effect of temperature on the frequency shift of piezoelectric quartz crystal biosensor. 目的探讨温度因素对压电石英晶体传感器检测频率变化的影响。
- The Continuous Phase Frequency Shift Keying(CPFSK) signaling scheme has been widely used in mobile applications. 连续相位频移键控(CPFSK)信号广泛应用于便携式移动通信系统。
- This is because that frequency shift can also be found in the wind vortex over the Arctic Ocean, U-wind in Beaufort Sea, V-wind in East Siberian Sea and the PDO index. 因此,除热力因素外,动力因素引起的海冰的平流与该变频现象也存在一定的联系。
- The raindrops approach speed is determined by the frequency shift, and provides a good estimation of the winds, which carry the raindrops. 透过这个频率转变,可导出雨点移近雷达的速度,从而替乘载这些雨点的风力提供了很好的估算。
- The frequency shift can simulate the emissive power of the base station very well and is good to the respiratory effect. 频移可以很好地模拟基站发射功率,这对呼吸效应也有好处。