查询词典 DOA

A novel direction of arrival and polarization estimation of electromagnetic vector sensors mounted on the airframe is proposed based on biquaternion. The signal processing model for EM-sensor mounted on the airframe is made by biquaternion and then the eigenvalue decomposition of spectral matrix is obtained by means of the EVD of its quaternion adjoint matrix. The memory requirement for data is reduced, and more accurate estimation result is gotten by deducing the stronger orthogonality constraint between the sin- gal and noise subspaces on the field of biquaternion. The performance of the new algorithm is confirmed through numerical examples.

针对机载电磁矢量传感器阵列DOA和极化参数估计问题，提出了一种基于复四元数估计方法，该算法利用四元数建立机载电磁矢量传感器阵列信号处理模型，然后利用四元数联合矩阵的特征分解得到阵列数据相关矩阵的特征分解，一方面使得计算过程中数据的贮存量大大减少，另一方面通过推导得到信号子空间和噪声子空间在四元数域上的正交性从而使DOA和极化参数佑计的精度更高，仿真证实了本算法的有效性。

Capon method for DOA estimation, the program is irrelevant to the three incoming signals DOA estimation.

详细说明： Capon法进行波达方向估计，该程序对3个不相干入射信号进行波达方向估计。

The algorithm is featured with insensitivity to Gaussian noise. The proposed algorithm can estimate DOAs without search and match problem.

因此，在阵元数相同的条件下，与传统的循环域DOA估计算法相比，DOA估计的分辨率和可估计源的个数均得到大幅度的提高。

To overcome the local optimal problem existing in some maximum likelihood DOA estimation algorithms, improve the estimation accuracy, a global optimal solution of nonlinear maximum likelihood DOA estimation is obtained by real-valued genetic algorithm proposed in this paper.

所提出的实数遗传算法由含实数域结构和目标函数信息的实数交叉和变异算子构成，是较理想的获取非线性实变量函数全局最优解的方法。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

Analysing the information strcture of the cross diploes, a DOA and polarization estimation method is presented for broadband signals.

研究了正交偶极子阵列的信息构成，提出基于该阵列的宽频段信号DOA与极化联合估计算法。

In this paper, the mathematical model of OFDM systems with cyclic prefix and virtual subcarrier is derived first. We propose a new carrier frequency offset estimation algorithm using the DOA-MATRIX method.

给出了加入循环前缀和具有虚拟子载波的正交频分复用系统的数学模型，利用DOA-MATRIX方法，提出了一种新的载波频率偏移估计算法。

When signals are uncorrelated, by using the specific weights in turn and refreshing the power measurements continuously, the time-changed DOA of signals can be traced.

在信号源不相关的情况下，通过对权矢量的循环使用和功率信号的更新处理，实现对DOA时变信号源的跟踪。

Among the plasticisers added to PVC polymer are DEHA and DOA, not part of the phthalates family.

在plasticisers增加聚氯乙烯聚合物和DOA是DEHA ，而不是部分邻苯二甲酸盐的家庭。

In the secondary net, they remain closed to traffic the road to the 5402, at the height of Bayarcal, in Almería; The LR 250, in Villameiana of Iregua; The CV 470, in Utiel and her To 121, at the height of Doa Godina's Almunia, at the province of Saragossa.

在二手网，他们仍然封闭，交通道路，向5402年，在高度巴亚卡尔，在阿尔梅里亚；该处250名，在villameiana的iregua ；简历470 ，在乌铁尔和她121 ，在高度doa戈迪纳的阿穆尼亚，在省saragossa 。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。