信号周期

一种基于HHT的信号周期性分析方法及应用

An Approach to Analyze the Period of a Signal Based on HHT and Its Application

用可编程定时/计数器8254构成线阵CCD光积分控制信号周期的数字调节器。

The programmable timer / counter 8254 is used to construct the digital controller of the linear CCD . The digital controller adjusts the period of the linear CCD integrate signal .

每次只采样一个信号周期的N个点；

N points can be sampled in one signal cycle each time ;

罗兰-C脉冲信号周期的数字识别及SOPC实现

Digital algorithm realized with SOPC for cycle identification of LORAN-C

采用PLL（锁相环）来实现采样窗口与被测信号周期的同步。

The method uses hardware PLL ( Phase-Locked Loop ) to synchronize the sampling window and the measured signal cycle exactly .

其中，频率比较单元在一定的参考时间内对预分频器的输出信号周期进行计数，然后通过比较计数结果与预设值的大小来估计VCO输出频率。

The frequency comparator counts the prescaler cycles within a certain reference time and compares the number with preset data to estimate the VCO frequency . The frequency comparison error is analyzed in detail .

提出了一种改进的快速付立叶变换（MFFT）的计算方法，在采样的持续时间不是信号周期整数倍的条件下，能够准确地提供此信号中各周期分量的特性。

Anew approach , named Modified Fast Fourier Transform ( MFFT ), is proposed to analyze the components of a periodic signal when sampling duration is not equal to an integer multiple of the fundamentals .

当输入脉冲信号周期大于0.1秒、幅度（p-p）在1&12伏范围内时仪器可靠工作，测量精度达到相对误差≤5×10~（-5）。

The instrument is worked reliably when the period is longer than 0.1 second and the amplitude ( p-p ) lies the range of 1 to 12 volts , and the relative error in the instrument is less than 5 × 10 ~ ( - 5 ) .

测试结果显示，电路的峰-峰抖动小于输出信号周期（Tout）的0.5%，锁相环锁定时间小于参考时钟预分频后信号周期（Tpre）的150倍。

The peak-to-peak jitter of the circuit is less than 0.5 % of the output period , T_ ( out ), and the locking time is less than 150 times of the reference clock period after prescaler , T_ ( pre ) .

一种基于最小能量泄漏的信号周期估计方法

Method of Signal Period Estimation Based on the Smallest Energy Leakage

基于离散方波变换的脉冲星微弱信号周期性检测

Pulsar Weak Signal Periodicity Detection Based on Discrete Square Wave Transform

近距离罗兰-C信号周期识别的数字化方法初探

A Digital Method for Cycle Identification of Short-distance Loran-C Signal

信号周期分段处理法诊断单级传动齿轮副故障

Signal periodic segment processing technique for diagnosing gear pairs faults

非同步取样下信号周期的鲁棒算法

A robust algorithm of period calculation in asynchronous sampling

在低速时，运用被测信号周期自动调整的电子计数器测周法，在宽量程范围内实现了高精度、实时快速测量。

This meter can be used to measure speed in wide measuring range .

在强电磁干扰环境下一类非正弦信号周期提取方法的研究

Strategy for Searching the Period of a Nonsinusoidal Signal in Strong EMI Condition

并应用到株洲市中心广场环形交叉口的信号周期确定中。

Extracting and analyzing sub-signals in heart period signal by using wavelet transform ;

插值法信号周期测量的精度分析

Accuracy Analysis of Signal Period Measurement Using Interpolation

场源效应受场源高度、信号周期、电阻率、测点距离等的影响。

Source effects vary with field periods , resistivity , source altitude and observation location .

非线性转移函数对滤波器结构混沌信号周期特性的改善

Nonlinear transfer function improving the period property of ( quasi - ) chaotic digital filters

方法三是实时跟踪测量信号周期和校正采样周期。

The third evaluates the signal fundamental period in real-time and modifies the sampling period .

周期域分析中的信号周期算法

Period Algorithm in Period Domain Signal Analysis

并用基于实数编码的遗传算法对信号周期和相位绿信号时间等控制变量同时进行优化。

A real-coded genetic algorithm ( RGA ) is used for simultaneously optimizing the green times and cycle time .

信号周期和谐波测量的仿真结果，证实了所提方法对提高软件同步测量精度的有效性。

The simulation results of both signal period computing and harmonic measurement show that the method is feasible and effective .

主要讨论了测量失真度的准同步方法&采样周期不要求与信号周期严格同步。

The quasi-synchronous technique , which means that sampling period doesn 't synchronize with signal period strictly , is discussed .

数字仿真试验以及模拟故障实验结果都证实了信号周期分段处理法诊断齿轮故障的可行性和有效性；它为诊断单级传动齿轮副故障提供一种有效手段。

Both the numerical simulated signal and the experimental investigation verify the availability of the signal periodic segment processing technique .

低频时间信号周期修正项的扣除和时延、场强的色散修正

Deduction of the Periodic Term and the Corrections of the Propagation Delay and the Field Strength Dispersion of LF Time Signal

该算法突破了绿波带控制方法需要统一各交叉口信号周期长度的局限性。

This algorithm breaks through the limitation that all intersections are controlled with a same cycle which is applied in green-wave method .

脉冲星是宇宙中最精确的时钟，其信号周期的精确度能够超过原子钟。

Pulsar is the most accurate clock in our universe , the accuracy of its period is more than that of atomic clock .

在非同步采样过程中，信号周期的测量是周期信号数字化测量和分析的重要环节。

In the course of non-synchronization sampling , signal period measurement is an important step in digital measurement and analysis of periodic signal .