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- Doppler frequency spectrum 多普勒频谱
- Moreover, since the atoms are in random thermal motion the frequency spectrum will be altered by the Doppler effect. 而且,由于原子是在作无规则热运动,多普勒效应也会使频谱发生改变。
- A filter whose transfer function is matched with the frequency spectrum function of input signal. 其传递函数与输入信号的频谱函数相匹配的一种滤波器。
- The doppler frequency is a function of the two scattering directions. 多普勒频率是两个散射方向的函数。
- Alters the frequency spectrum of signals passing through it. 当通过它时能够改变信号的频谱。
- The Doppler frequency can be obtained as a heterodyne or beat effect. 由于外差或频差效应,能够得到多普勒频率。
- Frequency Spectrum Measurement of Noise of Image Intensifiers[J]. 引用该论文 钱芸生;常本康;童默颖;刘磊.
- The inverted frequency spectrum,in fact, is Fouriers retransform. 倒频谱是频域信号的傅里叶再变换。
- Objective 1 To evaluate the character of color Doppler and frequency spectrum Doppler of cerebral artery stenosis by examining the patients who were suspected with cerebrovascular disease with TCCS. 目的1对怀疑有脑血管疾病的患者进行经颅彩色多普勒超声(TCCS)检查,探讨颅内动脉狭窄的彩色多普勒及频谱多普勒特征。
- Methods:To retrospectively analyze the color Doppler ultrasonogram and blood flow frequency spectrum of prostatic cancer in 12 patients,who were confirmed by pathologic examination. 方法:回顾性分析经病理证实的12例前列腺癌的彩色多普勒超声图像及血流频谱特征。
- With the high frequency, it can get great Doppler frequency which bepropitioustomeasure slow velocity. 其频率高,可获得更大的多普勒频率,更有利于慢速目标的检测;
- A new technique to estimate the Doppler frequency rate is proposed with high accuracy and low computation complexity. 本文提出了估算多普勒调频率的一种新方法,其精度高、计算量少。
- According to the laser gain change is linear related to the frequency shift, the Doppler frequency is extracted by the signal processing. 根据激光的增益变化和频率变化成线性关系,可以对信号进行处理求出多普勒频移。
- This algorithm has small computation amount load and has high estimation precision of doppler frequency rata-of-change. 算法具有计算量小、多普勒频率变化率估计精度高的优点。
- A system that divides the frequency spectrum of a signal into a number of bands, which are separately transmitted and then recombined. 一种先将一个信号的频谱分成几个可独立传送的频带然后再合成的方法。
- The arithmetic of target motion analysis is studied in this paper by means of Doppler frequency and bearing in Cartesian coordinates. 摘要研究一种在直角坐标系下利用多卜勒频率和方位信息的目标运动分析算法。
- 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。
- The Time Domain Wave Form and Frequency Spectrum of Modulated Signal of uexp( tt/ Pw) Multiply by Carrier with Uniform Phase Noise. 单边递减波电压讯号乘上含有均匀相位杂讯载波之调变讯号时域波形及频谱。
- The entire available frequency spectrum is used with 79 hops of 1Mhz bandwidth, analogous to the IEEE 802.11 standard. 以1Mhz带宽79跳来利用这个完整的可用频谱。这类似于ieee 802.;11标准。
- The CRAs and CRVs morphological features of Doppler frequency shift spectrums were recorded and analyzed with DRG Doppler retinal flowmeter(10 Mhz probe). 方法:采用 DRG眼用多普勒血流仪,对正常成年人男女各 24名双眼的 CRA、CRV多普勒频谱图象进行采集和形态分析。