查询词典 Doppler range

This paper makes an analysis of the Doppler speed charts of clear weather and the echoes of large-area precipitation. It also singles out the Doppler speed charts of typical wind fields. In addition, this paper analyzes Doppler radars detecting process of the strong convection current weather system. It also conducts a thorough analysis of Doppler echo features of some hazardous weather, such as cell storm and downward storms. Based on this research and analysis, the paper reaches some important conclusions concerning the detecting methods using Doppler radar and the analysis of the information gathered by Doppler radar.

本文通过分析晴空和大面积降水回波的多普勒速度图像，归纳总结出了典型风场的多普勒速度图象，并着重分析了多普勒雷达对严重危害飞行安全的强对流天气系统的探测，特别是深入分析了超级单体风暴、下击暴流等灾害性天气的多普勒回波特征，得出了多普勒雷达对灾害性天气进行探测的方法、雷达资料分析应用等方面许多有益的结论。

A method to measure the absolute velocity is developed in a spectral domain ODT system,where Doppler angle is determined by combined information on the measured Doppler shift and Doppler bandwidth,and then the flow velocity is determined from Doppler angle and Doppler shift.

发展了基于谱域ODT技术的绝对速度测量方法，该方法综合运用多普勒频移和多普勒展宽信息实现多普勒夹角的确定，进而实现流体绝对速度的测量。

The Doppler frequency shift and the Doppler broadening are comprehensively utilized, the narrow-band phase plate is inserted between a collimating mirror and a focusing lens of an imaging probe, thereby implementing the spatial encoding of the Doppler information, realizing the imaging requirements on the spatial high-resolution three-dimensional speed vector, combining with the Doppler OCT method which is based on the phase resolution technology to meet the high-speed and high-sensitivity measurement requirements and finally realizing the speed vector imaging with high-resolution, high-speed, high-sensitivity and large-imaging range of the three-dimensional flow field of the microfluidic chip.

综合利用多普勒频移和多普勒展宽，并在成像探头的准直镜和聚焦透镜之间插入窄带相位片，实施多普勒信息的空间编码，实现空间高分辨三维速度矢量的成像要求，再结合基于相位分辨技术的多普勒OCT方法则能够满足高速度高灵敏度的测量要求，最终实现对微流控芯片立体流场的高分辨率、高速度、高灵敏度、大成像范围的速度矢量成像。

From 1990, relevant technologies along the CFM image have been Doppler Energy Imaging, Color Doppler Energy, and Color Doppler Tissue Imaging.

目前我国相关实验室和研究所大力致力于这方面的研究，并将相关研究成果应用于超声仪器的制造中。

In order to design a high performance laser Doppler velocimeter, the relationship between the signal intensity of laser Doppler and the diameter of spot was analyzed using the speckle theory, and the calculation formulas of the Doppler current was given based on functional theory. The polarization characteristic of scattered light and its intensity distribution were investigated.

为了设计高性能的激光多普勒测速仪，运用散斑理论详细分析了激光多普勒信号的强度与散射光斑大小的关系，结合泛函理论给出了计算多普勒电流的散斑表达式，并通过实验的方法研究了回波信号的偏振特性及其强度分布。

Methods 60 cases of iatrogenic aneurysma spurium caused by puncture,transplantation of blood vessel and operation in neck were analyzed by dimension imaging,color Doppler and pulsing Doppler by using the method of color Doppler ultrasound.

采用彩色多普勒超声对60例因穿刺、血管移植术及颈部手术引发的假性动脉瘤进行二维图像、彩色多普勒及脉冲多普勒加以分析。

The key problems of software radio and direct sequence spread spectrum range used in high range radio fuze are discussed. The effects of doppler frequency and carrier's initial random phase are analyzed. A new direct sequence spread spectrum algorithm based on software radio is proposed, by using differential encoding and quadrature demodulating, the effects of doppler frequency and carrier's initial phase on the output of inference filter are eliminated successfully.

研究了软件无线电和直接扩频测距技术在大炸高无线电引信应用中的关键技术问题，分析了由于多普勒效应引起的载波频偏以及载波随机相位对测距的影响，提出了一种基于软件无线电的直接序列扩频解调算法，通过采用差分编码和正交解调的方法，消除了多普勒频偏和载波随机相位对测距的影响。

The quantity computed is the expected clutter power at the output of any specified range gate by the method of integrating reflected energy between constant Doppler loci in range-gate circles with a model of sum and difference antenna gain pattern for APAR. Base on the analyzing of APAR terrain clutter spectrum, Rayleigh, Correlated Log-Normal and Weibull distribution terrain clutter of APAR general pulse signal was simulated with the method of zero memory nolinearity transform.④The Doppler frequency of target echo is simulated on video frequency in this dissertation.

该软件采用了用C语言建立框架结构，而在程序高重复部分和有运算速度要求的地方，用汇编语言编写具有高并行能力程序的方法，不仅满足了系统高运算速度和实时性的要求，也使得软件系统结构模块化，代码具有良好的维护性和重用性；③对机载相控阵雷达HPRF、MPRF的和、差通道地面杂波功率谱进行了较为全面的研究，通过建立由四个子波束构成的机载相控阵雷达杂波和差波束天线方向图数学模型，选取体现高度线杂波的修正的地面后向散射模型，以载机平飞为例，采用沿距离门——等多普勒线区域积分的方法，得到了杂波功率谱，并利用零记忆非线性变换法实现了机载相控阵雷达常规脉冲情况下瑞利分布、对数正态分布和韦布尔分布地面杂波的模拟；④提出了采用在视频上对目标回波的多普勒频率进行模拟的方法。

Based on the analysis of bistatic SAR geometry model, bistatic SAR echoed signal is modeled in the double range variables domain in this paper, and the relationship between the double range variable domain and the single range variable domain is established. Then a range-dependent Doppler algorithm for imaging processing airborne bistatic SAR raw data of the translationally invariant configuration is derived, and the effect of error of the algorithm is analyzed by simulating.

摘要该文通过对机载双基地SAR非移变几何模型的分析，建立了双距离变量域的回波信号模型，由于回波数据是在距离和域，该文推导了距离和变量与双距离变量的转换关系，解决了该模型向距离和变量域转换的问题；提出了适用于非移变模式的变多普勒参数的双基地RD算法，并对该算法中引入变多普勒斜率所存在的误差进行了仿真分析。

After take analyzed deeply for the opened magnet circuit with FEMM (Finite Element Method Magnetics) we find out the field distributing that is separated into three sections . One is the main area what we called as positive field section. Beside the main field there are tow areas that are called the inverted field sections. Loudspeaker arise a very serious distortion when the voice coil moving into inverted field areas. The direction of induced current in the coil part of entered inverted field area is same with the current driving into loudspeaker so that total currents increas largely and heat increase rapidly. With more coils moving into inverted area the voice coil will take on negative inductance properties. It is the main reason that voice coil is burned by heating with increasing current due to arise negative inductance. So opened magnetic circuit is not suitable for the woofers in which the voice coil have wider displacement range. When using this kind magnetic circuit design, the voice coil moving range should be less than the range of positive field to avoid loudspeaker arise serious distortion and heating. Even though voice coil moving range is in the positive area, loudspeaker will still arise more distortion because the field distribution is very cliffy at tow sides of the positive area and full range of magnetic field distribution is not parallel that will arise distortion. Base on above reasons, opened magnetic circuit is not an ideal magnetic circuit for low-frequency loudspeakers. But it can be used in mid-range or high-frequency productions.

开式磁路是由2片钕铁硼磁铁和主导磁板和导磁垫片组成，我们在实践过程中发现这种磁路结构不适合于低频扬声器的使用，我们通过使用FEMM（Finite Element Method Magnetics）软件包对该磁路进行了分析，该磁路的磁场范围被分成3个区域，其中在主导磁板附近形成一个正向磁场，在正向磁场的两边存在反向的磁场，音圈在工作时有很大一部分进入了反向磁场中，在反向磁场内线圈的感应电流方向与驱动电流方向相同，使得音圈呈现出负感抗特性，由于音圈的负感抗特性引起电流的增加导致音圈发热甚至烧毁，因此在扬声器中使用开式磁路时，音圈的运动范围应控制在正向磁场范围之内，否则音圈运动到反向磁场区域时将会产生很大的失真和发热，即使在设计时已经将音圈的运动范围控制在正向磁场范围之内，由于正向磁场的2个边缘磁场强度衰减太快，同时开式磁路中磁场的分布不是平行的，而是自由发散的分布，这样肯定会导致扬声器的非线性失真，因此我们得到的结论是：开式磁路并不是一个理想的磁路，它不适合于低频扬声器的使用，但它还可以应用于中高频扬声器。

The production moved off-Broadway to New York City, where she won the Joseph E. Calloway award for her performance, and was profiled in American Theater Magazine as one of ten young theater artists to watch.

生产提出过百老汇的新的纽约市，在那里她赢得了约瑟夫calloway奖，她的表现，并于异型在美国的战区杂志之一， 10战区的青年艺术家观赏。

It's a risk tradeoff, and I believe that adding test support code usually wins.

这是一个风险的权衡，我相信添加测试代码通常会占上风。