利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency locking property when system transits from chaotic to great periodic motion.
而时域同步平均可以有效衰减与回转频率无关的干扰，提取与工作状态直接相关的周期信号。
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively, and extract the repetitive signals directly related to machine operation condition.
时域平均法是从混有噪声的信号中提取周期性分量的最有效方法。
The time domain average method is an efficient method to extract period components from the signal mixed with noise.
为提取机械设备故障诊断中的某些微弱信号，给出一种新的提取强背景噪声中微弱周期信号的方法。
A new approach to extract weak periodic signal from strong noise is proposed to pick up some weak signals in the fault diagnosis of mechanical equipment.
自适应预估器能用来提取宽带随机噪声背景中未知频率的周期性信号。
Self adaptive predictor is used to extract periodic signals with unknown frequencies from wide band random noise background.
本文介绍了一种基于DSP的低信噪比周期信号实时提取系统的设计和实现。
This paper presents a design and realization for a DSP based on real time low SNR periodic signal extracting system for low SNR signals.
利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency2locking property when sys2tem transits from chaotic to great periodic motion.
对直扩信号侦测的计算机模拟结果表明，该方法不仅能检测到低信噪比的此类信号，而且能提取到扩频码周期等参数。
One is the detection of low SNR DSSS signal and extraction of length of PN code, the other is detection of BPSK signal from multi signals.
若采样长度与回转速度不吻合，将会出现伪周期，使主值函数项中提取周期成分后的信号失实。
If sampling length doesn't adapt rotative velocity, the results of calculation by FFT or periodogram analysis will lead to pseudo-periods, which distorts the principal value function terms.
本文以类随机电报为背景，成功地提取了弱周期性故障信号；
Weak periodical fault signals can be extracted successfully from the background of QT.
统计算法在解决周期信号、高能噪声和高斯信号方面有独特之处，能简单有效提取以上噪声的特征；
The statistic of wavelet transform coefficient algorithm can solve the periodic noise, high-energy noise and some non-Gauss noise simply and effectively;
卫星云图的帧周期变化，数据是突发性的。为了提取帧同步信号，研制出“定位孔径技术”，可靠地提取帧同步信号。
The frame period of satellite image changes suddenly, a positioning aperture technique is implemented to reliably acquire the frame period.
卫星云图的帧周期变化，数据是突发性的。为了提取帧同步信号，研制出“定位孔径技术”，可靠地提取帧同步信号。
The frame period of satellite image changes suddenly, a positioning aperture technique is implemented to reliably acquire the frame period.
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