Objective:To seek for a new Echo Doppler method which can more sensitively detect changes of left ventricular diastolic function in NIDDM.
目的：应用肺静脉血流图结合二尖瓣血流图评价糖尿病心脏病变引起的左室舒张功能变化，旨在探讨更敏感的检测方法。
This paper introduces several methods retrieving wind direction from HF radar echo Doppler Spectrum and analyses the feature of those methods.
本论文介绍了现有的从高频雷达回波多普勒谱中提取风向的几种方法，分析了这几种方法的不足之处。
The basic work principle of a certain kind of Doppler radar is introduced, the relation between the echo Doppler frequency and other parameters is given.
介绍了多卜勒导航雷达的基本工作原理，推导了回波信号多卜勒频移与系统其它参量间的关系。
Several important parts are analysed and discussed, which include echo signal, azimuth processing, range processing multi-looks processing and Doppler parameters estimation for spaceborne SAR.
分别对星载sar处理的雷达回波信号、距离处理、方位处理、多视处理和多普勒参数估计几个主要部分进行了分析和讨论。
First, the echo signal model of Bistatic SAR is given and then the analysis of the signal in Doppler domain is performed.
首先给出了双站SAR的回波信号模型，接着分析了方位多普勒信息。
According to Doppler theory, simulated echo signal comprise the corresponding Doppler Spectrum, then ocean current velocity can be simulated.
并根据模拟回波信号中包含有相应的多谱勒谱的信息，模拟了海流的流速。
In the experiment, We have found that bubbles at various grades are distinctly different in the envelopes of Doppler echo spectrum.
通过实验，作者发现了不同级别的气泡在多普勒回波频谱包络上有明显区别。
Methods The manifestation, internal echo, the L/T ratio, CDFI and RI frequency spectrum feature of the superficial lymph nodes were studied with high frequency and color Doppler ultrasound 89 cases.
方法本组89例，应用高频率的彩色多谱勒超声检查肿大淋巴结的形态及内部回声、纵横比（L/T）、彩色多谱勒血流显像（CD FI）及阻力指数（RI）的频谱特征。
X band bistatic Doppler weather radar is a new kind of weather detection radar system. It can detect three dimensional wind vector fields from the echo of rain.
波段双基站多普勒天气雷达系统是一种新型气象探测雷达系统，主要用于测量降雨回波的三维风场。
Methods: Doppler ultrasonic diagnostic apparatus was used to observe the form, echo, activity and blood flow.
方法应用彩色多普勒超声诊断仪观察心脏瓣膜形态、回声、活动状态、瓣口血流情况。
The echo intensity data of Hefei Doppler radar observations come into being the initial fields of MM5 sensitive experimentation.
将安徽合肥新一代天气雷达观测的回波强度按上述方法加入到MM5中，形成敏感试验的初始场。
Doppler frequency shift observation of ionospheric high frequency echo is an important method for studying ionospheric disturbances.
电离层高频反射回波的多普勒频移观测是研究电离层扰动的一个重要方法。
Besides amplitude, phase and Doppler frequency, polarimetric information is the fourth characteristic in the radar echo.
雷达回波信号中，除幅度、相位和多普勒频移外，还存在第四特征——极化信息。
Micro vibrational targets, such as living things, are vibrate with certain frequencies and micro amplitudes, which module the echo as micro Doppler signals.
生命体等摄动目标以一定频率、较小幅度振动，其回波具有微多谱勒特征。
A detection method will let phased coded radar to detect such wideband doppler signal, whose result not only gives speed information, but also filters ground echo by speed as a anti-jamming measure.
相位编码雷达可以采用一种检测方法实现对该宽带多普勒信号的检测，其结果不但可以指示速度，而且还可以作为速度选通的抗干扰措施。
Since cannonball travels in the antenna beam of the radar, its echo signal contains Doppler information.
炮弹在雷达天线波束里飞行，回波信号包含多普勒信息。
Then discussing the phase information and Doppler characteristic of target echo wave in the pulse Doppler phase radar.
并且讨论了在脉冲多普勒相参体制雷达下目标回波的相位信息以及目标信号的多普勒谱特性。
Fixing the spectrum width of the weather echo signals, we change theirs mean Doppler frequency and filter them using regression filter. After filtering, we analyze the attenuation of them.
在天气回波信号谱宽固定的情况下，通过改变天气回波信号的平均多普勒频率，分析了回归滤波器对它的衰减情况。
When there is faint Doppler echo in noise, the system output is intermittent chaotic, and the Doppler shift can be obtained accurately by calculating the interval of chaotic state.
当噪声中含有微弱的多普勒回波时，通过理论分析可知系统输出为阵发混沌状态，且可根据混沌状态的间隔周期较准确地求出回波信号的多普勒频移。
Objective Assessment of echo characteristics of carotid atherosclerotic plaque (CASP) and its stenosis cases with acute myocardial infarction (AMI) in different ages by using Doppler ultrasound.
目的评价老年急性心肌梗死(ami)患者颈动脉粥样硬化斑块的超声回声特征及其狭窄程度。
Ultrasonic encounter impurities or boundary surface will produce significant reflection form reflex into echo, encounter moving objects can produce doppler effect.
超声波碰到杂质或分界面会产生显著反射形成反射成回波，碰到活动物体能产生多普勒效应。
Doppler echo is a sensitive and convenient method for diagnosis and follow - up.
多普勒超声为诊断和随访的敏感而便捷的方法。
The method in which coherent accumulation is carried out after the echo is compensated by a Doppler frequency shift is introduced.
提出了一种先对回波信号进行多普勒补偿后再进行相干积累的方法。
The pulse Doppler radar simulator discussed is used to provide radar echo signals and checkout the performance of radar in an open condition.
本文讨论的弹载脉冲多普勒雷达目标模拟器主要是在外场静态联试时为雷达提供模拟动态目标回波信号，以检查其截获跟踪性能。
The influence of different incident Angle, different fractal dimension and shadowing effect on the Doppler spectra of the echo from the fractal sea surface is discussed in detail.
详细讨论了不同入射角和不同分维及遮蔽效应对分形海面散射回波多普勒谱的影响。
Doppler modulated echo information of helicopter rotors has a better stability of the aircraft's attitude, which is the main information source of radar identifying helicopters.
旋转部件的多普勒调制信息具有良好的姿态角稳定性，是雷达识别直升机的主要信息来源。
Objective To investigate the application of a self made echo contrast agent and power Doppler imaging of ultrasonography on the vascularity of hepatic metastasis in experimental rabbits.
目的探讨自制造影剂和超声显像新技术在诊断实验性转移性肝癌血管特征中的应用价值。
The vortex in Doppler velocity field, Echo tops, Vertical integrated liquid, lift stream and cold advection are significant in this rainfall case.
多普勒速度场、回波顶高、垂直液态含水量、对应的上升气流以及温度平流对这次降水具有预报指示意义。
How to get the proper radar echo is a key problem in research of the micro-doppler features of human beings.
人运动的雷达散射回波的获取是研究人微多普勒特征的关键问题。
Method Left ventricular diastolic function was studied with pulsed doppler echo cardiography before and after vein administration Xinxuetong in angina pectoris patients.
方法：本文应用脉冲多普勒超声心动图对冠心病心绞痛者静脉输入心血通前后的左室舒张功能进行了测定。
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