收敛频率

But the effect is not good enough to track the varying slow signals, without the ability of astringency and antinoise.

此算法克服了同步采样条件限制，在不同初始频率下均具有较好的收敛性。

Secondly,in order to resolve the problems such as great calculation account and memory space of three-dimensional tomography,we study an approximate calculation method of three-dimensional Fresnel volume.

此外，通过模型实验，分析了频率对菲涅耳体层析反演收敛速度和成像结果等的影响，提出了用于菲涅耳体层析成像的一种变频方法。

Then gives out an optimised convergent algorithm and describes the system robustness by a closed curve on frequency domain, in which all possibte frequency responses.

提出一种计算过程可以迭代循环的最优收敛算法，并在频域复平面上给出描述系统鲁棒性的包络曲线，所有可能的、随系统不确定性而变化的频率响应都落在该曲线所包围的闭域内。

to reduce the impact of carrier frequency offset in ofdm system,this thesis designs a new carrier frequency offset estimation scheme for ofdm system.the carrier frequency offset estimation includes acquisition and tracking.we adopt variable step size adaptive algorithm.the acquisition range of the proposed algorithm is as large as one half of the overall signal bandwidth.through this method we can not only avoid the feedback by using forward error correction,but also reduce the times of complex multiplication in order to reduce the power consumption of the system.this algorithm not only has low complexity and fast convergence nut also can improve the demodulation performance of ofdm system.computer simulation illustrates the superior performance of the proposed algorithm with regard to estimation accuracy in both awgn channel and multi—path channel.

摘 要：为了减小正交频分复用系统受频率偏差的影响，在ofdm系统中设计了一种新的载波频偏估计算法。频偏估计包括跟踪和捕获两个阶段，文中采用变步长自适应算法来进行跟踪，这个跟踪算法的捕捉范围是整个信号带宽的一半。通过此方法，不但可以利用前向纠错的方式来避免反馈，而且可以缩减复数乘法的次数以降低计算复杂度和系统功耗。该方法运算复杂度低，并具有较好的收敛性，能改善odfm的解调性能。从计算机的仿真效果可以看出无论是在awgn信道上还是在多径信道上都表现出了卓越的性能。

Based upon the proposed approach the free vibration analysis of Euler beam with various typical boundary conditions is performed and the error and convergence behavior of the fundamental and second frequencies are studied in details.

针对常见的几种典型边界条件的Euler梁自由振动问题，详细分析了前两阶频率的误差和收敛性。

Frequency curve should be smooth, no sudden jump point oscillation; response curve of the rapid convergence.

频率曲线应平稳，无突跳振荡点；响应曲线应快速收敛。

Further, according to the positity of the Hessian matrix, which is got from the second order adjoint model, the uniqueness of the assimilation result is manifest. And the relationship between the rate of convergence and the frequency of the observation utilization in the assimilation is investigated.

进一步，借助二阶伴随模式所得到的Hessian矩阵，说明同化解是唯一的，并分析了优化算法的收敛速度与同化过程中观测资料使用频率的关系。

The effect of parameters such as the wedge angle, the incident wavefrequency and the angle of incidence is also analyzed. Furthermore, theaccuracies of the numerical results are checked by the convergence of theground surface displacement and residual errors of boundary conditionswith the increasing progression term.

本文定性分析了地形角度、入射角度和入射频率等因素的影响，并从级数项数增加时地表位移结果的收敛以及边界条件残量的收敛两个方面验证了结果的正确性。

For the novel passive detecting radar system,an algorithm based on the existing algorithm of Doppler changing rate is presented to improve the locating accuracy and convergence rate.The Doppler frequency is adopted as the observed quantity,at the same time the EKF algorithm is introduced to process the initial locating results.

针对新型无源探测系统的要求，在原有多普勒频率变化率无源定位算法的基础上，为提高定位精度和收敛速度，提出了增加多普勒频率作为观测量，同时引入EKF算法对原始定位结果进行了处理。

Moreover the vibration frequencies of the plate are comput-ed using iterative method, which begins with the in vacuo eigenfrequency and continues until in-water eigenfrequency con-verges.

从真空中模态特征频率出发用迭代法直到水中频率收敛为止而得到水中方板的特征频率，进而计算了方板的棤态辐射效率。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。