测向

We present some factors of model error, compare the influence with these factors.

分析了模型误差的各个因素，并比较了这些因素对测向算法性能的影响。

The technical advancement was to give rise to a whole new approach to remote sensing.

那种技术的改进产生了遥控测向的全新方法。

A pigeon probably has his Huff Duff in that incrustation above his beak.

鸽子也有它的无线电高频测向仪，也许就是它喙上部的那个硬包吧。

It has been reported that neonatal stimulation can cause lateralization in adult rats hemisphere.

已有报道表明初生期新环境的刺激能导致成年鼠大脑两半球的功能的测向化。

The impact on the system of direction finding for the existence of baselines' obliquity is approved in actual system.

给出了相位差和基线倾角的对应关系，并在实际系统中证实了基线倾角的存在产生的相位误差对整个测向系统的影响。

To solve the direction-finding with communication signal and the integration of communication and radiolocation,a new space-time OFDM modulation technique is proposed,and the system can transmit azimuth message.

为解决利用通信信号的测向和通信定位综合设计问题，提出了一种载有方向信息的OFDM时空调制技术。

The study and design of this new system have both theoretical and practical significance in virtual reality technology application and the development of shortwave direction finding training.

系统研究与设计对虚拟现实技术的运用及短波测向训练的发展具有重要的理论和实践意义。

With the development of science and technology, now in many areas of need to know the exact direction of useful signal, the frequency of parameters, the precise measurement of the signal to put a very high demand.

随着科学技术的发展，现在的许多领域中都需要知道有用信号的确切方向、频率等参数，从而对信号的精确测向提出了很高的要求。

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。

By using the noncircular characteristics, the fast algorithm provides a better performance than the traditional fast algorithm such as propagator method.

快速算法由于利用了信号的非圆特性比常见的快速算法，如传播因子算法等具有更高的测向精度。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新