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多普勒参数
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  doppler parameter
     Results The corresponding rate was 79.5%(31/39)and 87.2%(34/39)between gray-scale US and DSA and between gray-scale US combine with Doppler parameter and DSA, respectively.
     结果:单纯灰阶超声测定的直径狭窄率与DSA符合率79.5%(31/39),结合多普勒参数测定的诊断符合率87.2%(34/39)。
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     The system can process the real spaceborne SAR echo data,including processing of assistant parameter,orbit parameter estimation,Doppler parameter estimation,imaging processing,imaging display and packing of product data.
     该系统能够完成针对真实星载SAR数据的辅助数据处理、轨道参数估计、多普勒参数估计、成像处理、成像结果显示以及产品数据打包等一系列任务,实现从星载SAR回波数据到1级产品数据的处理流程。
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     Doppler Parameter Estimation for SAR using Match Fourier Transform
     匹配傅里叶变换的SAR多普勒参数估计
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     Method To compared with UA and MCA's Doppler parameter in the 44 cases umbilical cord around neck by caesarean section fetus and 61 cases by parturition fetus, take RI and VP as analysis target.
     方法 比较44 例脐绕颈剖腹产胎儿与61 例脐绕颈自然分娩胎儿的脐动脉及大脑中动脉血流多普勒参数,以RI及VP为分析指标。
短句来源
     Method To compared UA and MCA's doppler parameter in 44 cases of umbilical cord around neck by caesarean section fetus and 61 cases by parturition fetus,take RI and VP as analysis target;
     方法 比较 44例脐绕颈剖腹产胎儿与 61例脐绕颈自然分娩胎儿的脐动脉及大脑中动脉血流多普勒参数 ,以RI及VP为分析指标。
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  doppler parameters
     On estimation of ship’s Doppler parameters in ocean SAR imaging process
     机载SAR海面舰船成像多普勒参数估计
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     Doppler Parameters Estimation for Airborne Radar Based on DDC Model
     基于DDC模型的机载雷达多普勒参数估计研究
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     Study on Doppler Parameters Estimation of Airborne SAR Raw Data and Imaging Algorithms
     机载SAR实测数据多普勒参数估计与成像算法研究
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     A New Method of Doppler Parameters Estimation for Spaceborne SAR Based on Fractional Fourier Transform
     星载SAR多普勒参数估计的改进方法
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     Application of Orthogonal Wavelets Bases in Solving the Doppler Parameters of SAR
     正交小波基在SAR的多普勒参数求取中的应用
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  “多普勒参数”译为未确定词的双语例句
     Results The relationship between VI and expression of MVD, VEGF, between MVD and VEGF all showed a significant positive linear correlation (r=0.9199, P<0.001; r=0.6871, P<0.05; r=0.6556,P<0.05).
     结果兔VX2肿瘤血管的三维彩色多普勒参数VI与免疫组化参数MVD及VEGF之间均呈线性正相关(r=0.9199,P<0.001;r=0.6871,P<0.05)。
短句来源
     Analysis of Doppler Echocardiographic Parameters of Carotid Artery in Patients with Sleep Apnea Syndrome
     睡眠呼吸暂停患者颈动脉超声多普勒参数分析
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     Results:The correlation between VC,JL,JA,IJV and regurgitant volume were 0 87,0 48,0 65 and 0 64 respectively,and those between VC,JL,JA,IJV and regurgitant fraction were 0 89,0 61,0 71 and 0 64 respectively.
     结果:彩色多普勒过返流口宽度、返流长度、返流面积及瞬间返流容积与返流量的相关性分别为r=0.87、0.48、0.65和0.64; 上述彩色多普勒参数与返流分数的相关性分别为r=0.89、0.61、0.71和0.64。
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     Method The parameter of color Doppler was used to observe the local blood perfusion afthe brain in 84 patients of cerebral blood supply insufficiency with carotid artery atherosclerosis and in 30 normal persons.
     方法 采用Peter运用彩色多普勒参数 ,对 84例有颈部动脉粥样硬化的脑供血不足患者及 30例正常人颈动脉局部脑血灌注量进行对照观测。
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     Objective To assess the right ventricular (RV) function changes of patients with hypertension and compare the values of the different parameters to evaluate the RV function.
     目的 探讨高血压病患者右心室功能的改变 ,比较不同多普勒参数评价高血压病右心室功能的价值。
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  doppler parameter
Doppler parameter extraction of moving targets in SAR imaging by wavelet transform
      
Combined with the characteristics of Continuous Wavelet Transform (CWT), the responsibility and advantages of CWT in multi-point moving-target Doppler parameter extraction are analyzed.
      
Finally a kind of multi-point moving-target Doppler parameter extracting algorithm based on CWT are developed, and the computer stimulating results demonstrate the correctness of the algorithm.
      
The differences between baseline and maximum values of each Doppler parameter after the cuff deflation were calculated.
      
MHD-turbulence produced by the strong collisionless shocks could provide a sizeable non-thermal contribution to the observed Doppler parameter of the UV line spectra of the WHIM.
      
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  doppler parameters
This article reviews relevant tissue Doppler parameters and gives examples of the current clinical usage of this technique.
      
These data strengthen the need of including the evaluation of pulmonary venous Doppler parameters in each investigation in order to obtain supplementary information to interpret diastolic function of the LV in septic shock patients.
      
Are transoesophageal Doppler parameters a reliable guide to paediatric haemodynamic status and fluid management
      
Groups of three dogs were treated with a single oral dose of 0.5 or 2?mg/kg minoxidil or control vehicle, and M-mode and Doppler parameters were recorded at different time points before as well as 1, 3 and 24?h after treatment.
      
Comparison of Doppler parameters of central versus intraparenchymal renal arteries in physiologically normal newborns
      
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A method is proposed to perform the spaceborne Synthetic Aperture Radar (SAR) imaging processing based on the characteristics of SAR in this paper. 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. The computer simulation of terrain and spaceborne SAR imaging processing are made, which includes azimuth processing, range migration correction, multi-looks processing and...

A method is proposed to perform the spaceborne Synthetic Aperture Radar (SAR) imaging processing based on the characteristics of SAR in this paper. 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. The computer simulation of terrain and spaceborne SAR imaging processing are made, which includes azimuth processing, range migration correction, multi-looks processing and motion compensation. The result of computer simulation shows that this method is effective.

根据SAR的特点,本文提出一种星载合成孔径雷达(SAR)成像处理方法。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。对地面原始图像和包括方位处理、距离徙动校正、多视处理和运动补偿的星载SAR成像处理进行了计算机仿真。计算机仿真结果表明该方法是有效的。

The formulation of Doppler parameters (Doppler centroid and Doppler frequency rate) from the geometry of satellite-borne SAR is derived. After analysing the error sensitivity of SAR orbit and attitude parameters, the error allocation principle for satellite attitude parameters is presented. Finally, the feasibility to calculate the satellite attitude from the Doppler centroid extracted from SAR raw data is proved.

本文从卫星与地面目标之间的空间几何关系出发推导了多普勒参数(多普勒中心频率和多普勒调频率)与卫星轨道参数和姿态参数的关系式,并与从雷达信号中提取的参数值进行了比较;分析了各参数误差的灵敏度;提出了卫星姿态角误差分配原理。最后分析了由已知的多普勒中心频率反算姿态参数的可行性。

This paper discusses the effects on spaceborne synthetic aperture radar(SAR) imaging quality resulting from errors in the Doppler parameters used in imaging processing,and proposes a new method called Autofocus estimation method to estimate Doppler centroid and Doppler frequency rate with the cross-correlations of the first-look and the fourth-look subimag- ings in range and azimuth respectively.By using the spaceborne SEASAT-A raw data,it is clear- ly verified that the above mentioned new method is able to...

This paper discusses the effects on spaceborne synthetic aperture radar(SAR) imaging quality resulting from errors in the Doppler parameters used in imaging processing,and proposes a new method called Autofocus estimation method to estimate Doppler centroid and Doppler frequency rate with the cross-correlations of the first-look and the fourth-look subimag- ings in range and azimuth respectively.By using the spaceborne SEASAT-A raw data,it is clear- ly verified that the above mentioned new method is able to give high estimation accuracy of both Doppler parameters for a quasi-homogeneous or a non-homogeneous scene and is also able to de- crease a great deal of computation of Doppler parameters estimation.

主要分析了星载合成孔径雷达(SAR)多普勒参数的估计误差对成像质量的影响,提出了利用自聚焦同时估计多普勒质心和多普勒调频率的方法;该方法使得两个多普勒参数的估计在准均匀和非均匀场景下能同时具有较高的精度,而且使估计的运算量也大为减少;最后通过星载 SEASAT-A海洋卫星原始数据成像试验,证明了该方法的优越性。

 
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