多普勒频移

Finally, the highly precise estimation of target azimuths is obtained by processing the added pulse compression data vector with Capon algorithm again.

然后利用回波数据及目标的初步位置信息，把同一目标对应不同发射阵元的脉压数据矢量经多普勒频移和相位补偿后相加，再进行Capon谱估计，获得高精度的目标方位角估计值。

Experimental results show that the method can accurately detect carrier Doppler frequency shift.

结果表明，相位测量方法能精确地测出载波多普勒频移且速度更快，完全能满足后续跟踪环的要求。

Based on the comparison with the acquisition algorithm in time domain,the circular correlation algorithm in frequency domain was used for fast acquiring C/A code initial phase and Dopller frequency shift of GPS signal.

在与传统的时域串行搜索捕获算法比较的基础之上，分析了利用FFT实现C/A码初始相位和载波多普勒频移快速捕获的频域圆周相关算法模型。

Based on scattering signal model, the estimation algorithm is obtained, and effect of doppler frequency compensation error on measurement result is analyzed.

在建立回波信号模型基础上，给出了极化散射矩阵估计算法，并分析了多普勒频移补偿误差对测量结果的影响。

In the condition of long pseudo code and large carrier Doppler frequency shift, the number of FFT points in the conventional synchronous acquisition algorithm is too large, the complex multiplication is of high computational complexity and large time cost, and the parameter evaluation acquired in a long duration is not applicable for carrier tracking because it is too old.

当伪码较长、载波多普勒频移较大时，传统的同步捕获算法进行的FIT点数较多，复数来加运算量大，耗时长，而在校长的捕获时间内，捕获得到的参数估计过于陈旧，无法应用于载波跟踪，为此，文中提出了一种改进的快速同步方法。

Two common methods of GPS signal coarse acquisition are analyzed and compared in this paper, and an optimized method is adopted. Two common algorithms of calculating fine frequency are analyzed and compared and the conics fitting is designed to calculate the fine frequency. Based on the distributing character of Doppler frequency shift, swing frequency style of Doppler frequency shift search is employed.

对比分析了两种常用的GPS信号粗捕获实现方法，设计了一种优化的实现方法；同时对常用的两种精细载波频率算法进行了比较分析，设计了一种二次曲线拟合的方法计算精细载波频率；基于多普勒频移的分布特点，改变以往顺序搜索的方式，采用跳频搜索的方法。

The method was proposed to compensate the residual cumulative error in the project, and the optical frequency multiplication effect on residual cumulative error is analyzed, and the model of laser heterodyne interferometric fast ultra-precision measurement is proposed.

为实现激光外差干涉快速超精密测量，通过分析测量棱镜三维运动对激光多普勒频移的影响，针对传统激光外差干涉测量模型存在的原理性残余累计误差，而且误差存在累计现象，提出了在工程中补偿残余累计误差的方法。

Today, we call it the Doppler Shift.

现在 我们将这称为多普勒频移

The statistical performance of the joint estimation method is discussed based on the simulation, and the results show the good performance of the method at low SNR.

研究了低信噪比情况下利用时频分析方法进行时延和多普勒频移联合估计的性能，表明联合估计方法的统计性能良好。

The light emitted from a Keplerian ring around the objects with strong gravitational field should be affected by Doppler shift, gravitational redshift and deflection of light. The line profiles for a faraway observer are dominated by these effects. In this paper the precise solutions of line profiles for the Keplerian rings in the Schwarz-schild case have been obtained by means of the kinetic equation for photons.

对于一个围绕强引力场物体作开普勒运动的环状发光物，它所发射的光线要受多普勒频移，引力红移和光线偏折等效应的作用，这种作用决定了远处观察者所看到的谱线轮廓，本文利用光子输运方程方法，求出在Schwarzschild度规中的开普勒环所发射的谱线的轮廓的精确解。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。