| 1. | 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。 |
| 2. | 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。 |
| 3. | One of these problems is the broadening of the first order sea echo doppler spectrum , which most likely swamps the targets spectrum
本文针对这样一个关键性问题?展宽海浪谱中信号检测问题展开研究,即如何应用超分辨谱估计技术来实现目标的检测与分辨。 |
| 4. | 2 . respiratory variation index ( rvi ) in normal man pulsed - wave doppler spectra of the four cardiac valves were recorded and compared with sequoia 512 and acuson 128 xp / 10 in 79 normal subjects aged 18 to 70 years
正常人rvi值范围的测定79名健康志愿者，采用sequoia512和acuson128xp 10彩色电脑声像仪，记录各瓣口血流速度、同步心电图和呼吸曲线。 |
| 5. | Results the doppler spectrum of the combined motion of the chamber and the fluid was the vector sum of their doppler signals . conclusion cardiac motion alters the doppler signal derived from blood flow and this effect should be considered in the doppler flow velocity measurement
结论通常所谓的血流速度频谱实际上是血细胞在心脏内流动速度和心脏运动速度的矢量和，即两项运动的复合频谱，所以，为减少误差，在用多普勒血流速度频谱测定血流参数时，应考虑校正问题。 |
| 6. | In the second chapter , a wideband mimo channel model with multiple - tap was integrated according to the angle of departure of the transmitting signal and its spread angle , the angle of arrival of the receiving signal and its spread angle , power azimuth spectra , doppler spectrum and the geometric construction of antenna array both sides of transmit and receive , on the basis of full research on the theories of space - time channel model proposed in the recent literature
第二章在对最近文献中提出的一些空时信道模型理论进行详细研究的基础上，根据发射信号的离开角及其扩展角、接收信号的到达角及其扩展角、功率方位谱、多普勒谱和收发两端天线的拓扑结构，综合了一个多抽头的宽带mimo信道模型。 |
| 7. | To the problem of getting wind direction from one wave - bind of one radar , this paper brings forward a method of retrieving wind direction from hf radar echo doppler spectrum based on genetic arithmetic ( ga ) , which is a new method to retrieve wind direction . it ' s also a useful exploration on the application of retrieving the sea parameters using genetic arithmetic
对于风向的确定，针对单站雷达单波束提出了基于遗传算法由高频雷达回波多普勒谱反演海面风向的方法，与实测风向结果对比表明该方法是可行的，为海面风向的反演提出了一种新方法，也为遗传算法应用于海况参数的反演作出了有益的探索。 |
| 8. | Then , based on the existing methods of mimo wireless channel modeling and a variety of present mimo wireless channel models , we integrated a wideband mimo channel model . it ’ s of stochastic type and uses the angle of arrival , angle of departure , azimuth spread , the topology of both transmitter and receiver , the doppler spectrum , the power delay profile , etc . as its parameters
并在此基础上,根据发射端和接收端天线的阵列结构、发射信号的离开角与角度扩展、接收信号的到达角与角度扩展、角度功率谱、多普勒功率谱和信道的功率时延分布等参数,综合了一个统计mimo无线信道模型。 |
| 9. | Combine with the project " hf ground wave radar supervise sea status " of state 863 project , retrieving wind direction from hf radar doppler spectrum and the showing of wind field , current field , wave field are researched in this paper . the problem of how to represent the sea surface parameters by computer is concerned , too
本文结合863 - 818 - 01 - 02课题“高频地波雷达海洋环境监测技术” ，研究了由高频雷达海面回波提取风向信息和海面风场、浪场、流场信息的计算机表征方法及其数据传输反演和表征的若干问题。 |
