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。
In this paper, the frequency spectrum and the bandwidth of the frequency shift signal with continuous and discontinuous phase are analyzed.
分析了相位连续与不连续移频信号的频谱并比较了它们的带宽。
"It will signal a dramatic shift to a cleaner, more sustainable method of providing frequency regulation on the grid," Beacon CEO Bill Capp told the GridWeek conference in Washington last week.
“这是一个巨大的改变，我们可以用更环保、更持续的方法来让电网实现频率的调整。”灯塔公司首席执行官比尔·凯普上周在华盛顿出席电网周（GridWeek）大会时说道。
It is an important technology to shift the frequency in digital vocal (musical) signal processing.
频移处理是数字语音(音乐)信号处理中一项十分重要的技术。
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。
In the communication of multiplex system, the DS signal exists Doppler frequency shift for the high dynamic situation of aerocraft.
在复合系统通信中，飞行器的高动态使扩频信号存在多普勒频移。
Test results demonstrate that this system can increase the accuracy of railway frequency-shift signal detection effectively, and has high integration level and reliability.
测试结果表明本系统能有效地提高铁路移频信号检测的准确度，具有高集成度和高可靠性。
The key factors of the Relayed frequency shift jamming to it's quality are it's frequency shift amount and the time delay between the jamming pulse and the jammed signal.
决定转发移频脉冲干扰品质的是其移频量和与信号脉冲的相对延迟时间。
A form of frequency modulation in which the carrier frequency is shifted between a mark frequency and a space frequency in response to the impressed intelligence signal (frequency-shift keying).
频率调制的一种方式，其中载波频率在标志频率和场频率之间移动，以响应外加的情报(数据)信号。
With the accelerating of the speed, frequency-shift signal detection system established based on traditional detection method is facing great challenges in China.
随着我国铁路的提速，基于传统检测方法建立的移频信号检测系统面临着极大的考验。
According to the characteristics of frequency shift track circuits, this paper has analyzed signal acquisition methods of voltage and current measurement on line.
根据移频轨道电路的特点，本文分析了电压、电流在线测量过程中采用的信号采集技术。
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。
But when the frequency of components is too near, HHT cannot shift the narrowband signal because of mode confusion.
但由于模态混淆，当信号组合分量的频率太接近时，HHT常不能正确分解窄带信号。
It has the characteristics like small volume, low power loss, quick frequency shift and elevated signal indication.
它有体积小、功耗低、频率变化速度快、信号指标高的特点。
Based on the fact that a chirp radar signal has a strong coupling between time and velocity, a deceptive jamming technique with shift frequency is proposed.
本文基于线性调频脉压信号在时间和多卜勒频率间存在强耦合的事实，提出用移频干扰实现欺骗干扰的方法。
The article analyses the frequency security & stability of signal generator circuit of dispatching equipment of automatic block with frequency shift, and an optimum design scheme is concluded.
本文对移频自动闭塞发送设备信息源电路的频率安全性及稳定性进行了分析，并总结出最佳设计方案。
At the last, we designed a UM71 track signal parameters detecting system base on TMS320F2812, and implemented part functions of the frequency-shift track signal detecting.
最后我们以TMS320F 2812为核心设计了UM 71轨道信号的参数检测系统，并部分实现了移频轨道信号的检测功能。
A digital signal processing way is established to obtain ultrasonic signal frequency shift in the test of high sand content fluid flow.
笔者采用数字手段去测取超声波信号的频差，通过频差法可得出流体的平均速度，进而获得高含沙量流体的流量。
Based on the characteristics of Domestic frequency shift key track signal, this paper presents a kind of appropriate detection method for our national train signal — Time-frequency analysis.
根据移频轨道信号的特点，本文提出了一种适合我国铁路信号的检测方法——时频分析的方法。
The frequency of the self-mixing interference signal is acquired by time-frequency analysis, and this frequency is equal to the Doppler shift, so the velocity of external object is gained easily.
该方法通过时频分析获得自混合信号频率随时间的变化，利用激光与外部物体相互作用后的多普勒频移与信号频率相等的关系，非常方便的获得了外部运动物体的速度历史信息。
The frequency of the self-mixing interference signal is acquired by time-frequency analysis, and this frequency is equal to the Doppler shift, so the velocity of external object is gained easily.
该方法通过时频分析获得自混合信号频率随时间的变化，利用激光与外部物体相互作用后的多普勒频移与信号频率相等的关系，非常方便的获得了外部运动物体的速度历史信息。
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