Further more,it is proved by simulation experiments that frequency shift and noise modulation with some bandwidths could be conveniently achieved making use of multi-bit phase quantization and signal reconstruction.
仿真试验证明,采用多比特相位量化和信号重构能方便地实现移频调制和各种带宽的噪声调制。
This paper puts forward the improved Fourier transform configuration method,which can not necessarily determine the position of main frequency point and frequency shift but directly make Fourier inverse transform to the primary spectra of the gate image spectra without influencing the result of phase difference.
提出一种改进的傅立叶变换轮廓法,可以不必确定主频点的位置和移频处理,而直接对栅线图像频谱的一级频谱作傅立叶逆变换,不影响相位差结果。
Remote sensing image fusion method based on wavelet packet frequency-shift;
基于小波包移频算法的遥感图像融合技术
Design of detector for frequency-shift track signal;
移频轨道信号测试仪的设计
A plan of frequency-shift equipment with microcomputer on railway signal is proposed, which replace the old frequency-shift equipment.
介绍了一种以单片机为核心实现铁路信号移频发送设备电子化的方案 ,用来替代由分离元件构成的移频发送盒 ,从方案设计思想、设备的硬件组成框图和软件设计流程等方面进行了详细的论述 。
The traditionnal frequency shifting automatic block systems are disadvantages involved behindhand technology,small information,bad credibility.
为改变传统移频自动闭塞系统存在技术落后、信息量少、可靠性差,不能满足现代运输生产的发展需求状况,应用先进的单片机技术,可编程逻辑芯片(FPGA)和高性能CPU,通过逻辑结构设计和时序控制,实现了移频自动闭塞设备的集成化、通用化,大幅度提高了列车运行的可靠性,并为实现机车信号主体化创造了条件。
Precision of phase demodulation in practical 3D detection using the projected grating phase method was improved by recognizing that spectrum mixing and inaccurate frequency moving greatly affected the accuracy of phase demodulation.
为提高投影栅相位法在三维检测实际应用中的解相精度 ,分析了频谱混叠及移频方法的不准确对解相精度造成的影响 ,建立了一种新的频域相对解相技术。
The problems are analysed in practical 3D detection by phase approaching of projected grating that frequency moving in frequency domain and the correspondence between measured surface and reference plane have great effect on the accuracy of phase demodulating.
根据投影栅相位法三维检测实际应用中所遇到的频域处理的移频问题和被测物体与参考面的对应关系问题，分析了它们对解相精度的影响，提出了不移频和全场参考面的解决方法。
Research and Development of the monitor system of shifting frequency signals;
移频信号监测系统的研究与开发
In terms of the disadvantages of the two presently comparatively advanced interval automatic blocking technologies: ZPW-2000A jointless shifting frequency automatic blocking and microcomputer axle counter technology,this paper combines them based on actual projects to complement each other so as to improve the efficiency and safety of rail transport.
针对ZPW-2000A型无绝缘移频和微机计轴这2种目前比较先进的区间自动闭塞技术的弊端,结合工程实际,将二者结合起来,互相弥补不足之处,以改善区间列车的行车效率及安全性。
Enhancement of magnetoimpedance by magnetic field-induced frequency shift;
利用磁致频移提高磁阻抗效应
The particle property of light and Doppler frequency shift;
光的粒子性与多普勒频移
Experimental study of frequency shift of reflected microwave from laser-induced plasma
激光等离子体对反射波频移影响的实验研究
frequency shift keying
键控频移频移键控频移键位
FSK tone detector
移频键控音频检波器
phase comparison sinusoidal frequency shift keying
相位比较正弦移频键控
multiple frequency shift keying telegraph terminal
多频移频键控电报终端机
Research on a Frequency Conversion Measuring Apparatus for Power Frequency Parameters of Transmission Line;
高压输电线路工频参数移频测量装置的研制
System Design of Track FSK Signal Based on Time-Frequency Distribution;
基于时频分析技术轨道移频信号接收系统设计
UHF mobile transceiver
超高频移动式收发机
satellite Doppler shift measurement
卫星多普勒频移测量
drift cancelled frequency synthesizer
漂移抵消式频率合成器
VHF SSB mobile radio set
甚高频单边带移动电台
VHF mobile transceiver
甚高频移动式收发机
frequency shift transmitter monitor
频移发射机监控装置
high-frequency displacement detection amplifier
高频位移检测放大器
Doppler-shift ocean-current meter
多普勒频移海流测速仪
prestack F-K migration method
叠前频率-波数域偏移法
frequency deviator
频率偏移器, 频率致偏装置
GSM900/1800 Two Band Mobile Phone RF Circuit Design;
GSM900/1800双频移动电话射频电路设计
Mobile Communication Doppler Frequency Shift and High-speed Railway Coverage Technology
移动通信多普勒频移与高铁覆盖技术
