查询词典 signal noise ratio

In order to decrease the measuring error of signal processing in laser Doppler velocimeter, frequency spectrum correction methods for lacer Doppler signal were proposed. Basic principles of energy centrobaric correction, ratio correction and phase difference correction were expounded. The three methods processing ideal sinusoidal signals was simulated with different signal frequencies, and so was the ratio method processing sinusoidal signals with different noises and signal to noise ratios.

在激光多普勒测速仪中，为了减小由信号处理算法带来的测量误差，提出运用频谱校正算法对多普勒信号的频谱进行校正，详细阐述了能量重心法、比值法和相位差法3种离散频谱校正算法的基本原理，运用这3种算法对理想正弦信号进行仿真，并运用比值法对信号施加不同频率和信噪比的噪音下的正弦信号和实测的多普勒信号进行仿真及实验研究。

This paper uses the reformative Kalman filter to deal with the original pressure data sampling from oil conveying pipeline in real time to eliminate the noise interference and to improve the noise-signal ratio. It also uses the signal after being filtered to give an alarm and exact position of the leakage of oil conveying pipeline.

本文应用改进的Kalman滤波器对采得的输油管道原始压力数据进行实时性滤波，以消除噪声干扰、提高信噪比；利用滤波后的信号进行输油管道泄漏的报警和定位。

It is a significant for the development of the geoscience study to solve the earth surface effect and to improve ratio of signal to noise in the heavily ambient noise with speed industrialization and citifying.

其目的是为了解决地球的表面效应和人类社会高度发展的城市化、工业化、现代化带来的噪音干扰，提高信噪比，推进现代地球物理观测与研究。

For a wide range of signal-to-noise ratio,the decoder has...

仿真结果表明了该解码器的有效性。

According to the simulation results, BIQ4 method resulted in the highest diffraction efficiency and the signal-to-noise ratio.

根据模拟的结果，BIQ4可得到最高的绕射效率及讯杂比。

The signal-to-noise ratio is always a key factor to limit the development of passive laser detection system.

系统信噪比一直是制约激光探测武器性能的关键性因素之一。

But NMR imaging technique is a technique of low signal-to-noise ratio and long imaging time.

但是，磁共振成象技术是一种信噪比很难提高的成象时间长的技术。

Experimental results indicate a pronounced improvement in signal-to-noise ratio by using the proposed algorithm.

试验结果表明，改进演算法的信噪比得到明显改善。

The explicit expression of the output signal-to-noise ratio of the system was obtained based on linear system theory.

基于线性系统理论，得到了系统输出信噪比的表达式。

Times of signal-to-noise ratio being taken as detection limit, the limits of 3 kinds of pesticides detected by this method were: Aldrin of 0.3 μg/kg, Dieldin of 0.5 μg/kg and Endrin of 0.3 μg/kg respectively.

以3倍信噪比为检出限，采用该方法对3种杀虫剂的检测限分别为：艾氏剂为0.3μg/kg；狄氏剂为0.5μg/kg；异狄氏剂为0.3μg/kg。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。