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pulse doppler spectrum 脉冲多普勒频谱
Power Spectrum Stimation for Pulse Doppler Radars 脉冲多普勒雷达的随机脉位信号功率谱估计
The energy centrobaric method is made use of correcting the Doppler spectrum, the simulation predicted value of the target velocity is obtained. 用能量重心校正法对多普勒频移校正，进而得到物体的运动速度的模拟计算值。
The simulation proved that the algorithm can accomplish the pulse Doppler identification under great acceleration. 最后仿真表明，该算法可以完成高加速度下的脉冲多普勒测速。
Conclusions:The Doppler spectrum of CFV in moderate and severe TR group is characteristic with high atrial reversal velocity and long duration. 中、重度 TR组 CFV血流频谱受呼吸运动的影响减低 ; Va与 TR程度显著正相关 (r=0 .;92 3;P<0
Active homing guidance system mostly adopts the pulse Doppler system. Therefore, research has important significance for radar seeker simulation. 主动寻的制导系统大多采用脉冲多普勒体制,因此研究该类型雷达导引头仿真具有重要意义。
In the paper,digital radio frequency memory(DRFM) is applied to airborne radio fuze jammer to jam pulse distance-detecting fuze and pulse Doppler fuze. 将数字射频存储器(DRFM)应用到机载无线电引信干扰机中用来对脉冲测距引信和脉冲多普勒引信进行干扰。
Results:The blood flow was abundant around the cancer tissue.The color signal of blood flow showed garland-like or punctate.The feature of its Doppler spectrum was o... 结果:前列腺癌周边血流丰富,彩色血流信号呈花环状或点棒状,多普勒频谱测值为高阻力指数特征。
Observed the effecting on parameters of left ventricular systolic function after myocardial infarction during infusion dobutamine(Dob) by pulse Doppler echocardiography. 应用脉冲多普勒超声心动图观察静注多巴酚丁胺（Dob）对心肌梗塞（MI）后左室收缩功能各项参数的影响。
Pulse Doppler radar measurements consist of range, azimuth, elevation and radial veloc-ity, while most of the radar measurements only consist of the fomer three. 摘要多普勒雷达对目标的观测数据是由距离、方位角、俯仰角和径向速度组成，而大多数雷达的观测数据仅由前三者组成。
Active radar seeker mostly adopts pulse Doppler monopulse radar system.So it is significant to research on the modeling and simulation of this kind of radar seeker. 主动雷达导引头大多采用脉冲多普勒单脉冲体制，因此研究该类型雷达导引头的建模和仿真有重要意义。
Analysis of tracking performance and resource management for pulse doppler phased array radar is done by simulation with incorporating radial velocity into the IMM filtering. 摘要针对脉冲多普勒体制的相控阵雷达，利用交互多模型方法，分析了径向速度对相控阵雷达跟踪性能及雷达资源管理的影响。
Objective:To detect the characteristics of Doppler flow spectrum of common femoral veins(CFV) in patients with tricuspid regurgitation(TR) and to determine the relation between Doppler spectrum and the degree of TR. 目的应用多普勒超声技术检测三尖瓣返流 (TR)患者的股总静脉 (CFV)血流频谱 ,探讨频谱形态与 TR程度的关系。方法 TR患者 6 5例 ,轻度 2 8例 ,中度 2 0例 ,重度 17例。
In PAH group, the mitral valve orifice blood streams, the AV of Doppler spectrum,the velocity-time integra and AV/EV, AVI/EVI were all increased significantly compared with the control group (P<0?01). PAH组与对照组比较;二尖瓣口血流多普勒频谱A峰流速(AV)、速率时间积分(AVI)及肺动脉压与二尖瓣口血流频谱比值(AV/EV);AVI/EVI均逐渐明显增大;差异均有显著意义(P<0.;01);
The NIMA Method for Improved Moment Estimation from Doppler Spectra. 从多普勒光谱进行的改进瞬时评估的NIMA方法。
Methods Left ventricular stroke volume (LVSV) in 36 healthy volunteers were measured by RT-3PE, M-mode Teichholz, two-dimensional echocardiography (2DE) simpson method and the product of aortic flow Doppler spectrum integral and aortic valvular area. 方法应用RT-3PE测量36例正常人的左室每搏量(LVSV),并分别与M型Teichholz法、二维超声心动图Simpson法、多普勒主动脉瓣环血流量法所测的LVSV进行比较。
Missile acceleration dominates echo Doppler spectrum broadening, hereby a single/multiple target discrimination method using the super?resolution spectrum estimation after signal de?chirping is put forward. 导弹加速度对目标回波多普勒频谱展宽起主要作用,据此提出了去斜率后进行超分辨谱估计的单/多目标鉴别方法;
In the modern electronic war, TRAD (Towed Radar Active Decoy) became an efficient way against PD (Pulse Doppler) radar seeker as a novelty jamming technique, and it has an important value in ECM field. 在现代电子战争中,拖曳式雷达有源诱饵干扰作为一种新型的干扰方式,是对抗脉冲多普勒雷达导引头的有效手段,其在电子对抗领域中具有重要的应用价值。
By analyzing the relationship between basis expansion model (BEM) and Doppler spectrum, the authors propose a scheme based on fractional BEM for the estimation of doubly selective channel parameters. 摘要通过分析复指数基扩展模型(BEM)与多普勒扩展频谱之间的关系，提出一种基于分数倍基扩展模型的双选信道估计方法。
Methods:Mitral annular early diastole(Ea)and late diastole(Aa)velocities of 30 diabetic patients were measured by DTI and mitral annular inflow velocities E,A were compared with pulse Doppler. 方法 :以 DTI技术检测 30例 DM患者二尖瓣环舒张早期运动速度 (Ea)和舒张晚期运动速度 (Aa) ,并用脉冲多普勒法检测二尖瓣舒张早期血流速度 (E)和舒张晚期血流速度 (A) ,比较两组参数的不同。