查询词典 DOA

In order to reduce calculation in the process of vertical scale identification of torpedo acoustic image,we present an improved decoherent multiple signal classification method based on quadrature complex sampling which suits to estimating the vertical highlights of submarine with the characteristics of near distance and coherent signals .

在鱼雷声成像垂直尺度识别中，根据潜艇垂直方向上目标亮点相距较近，且为相干信号源的特点，同时为了减小运算量而易于工程实现，提出了一种基于正交采样的高分辨DOA估计算法，即正交解相干MUSIC算法。

Torpedo ; acoustic image ; scale identification ; target highlights ; direction of arrival estimation ; decoherent multiple signal classification method

鱼雷； 声成像；尺度识别；目标亮点； DOA估计；解相干MUSIC算法

Manipulation can improve SOD activity of DOA and alleviative degeneration of articular cartilage.

手法可提高兔膝关节骨性关节炎滑膜组织中SOD活性及减缓关节软骨退变。

Many numerical results are provided to demonstrate the high resolution of the proposed methods. Compared with the conventional MUSIC method, the proposed methods are insensitive to angular signal distribution.

仿真实验结果表明，这些分布式目标波达方向估计方法都具有较高的分辨能力，与基于点目标假设的常规MUSIC方法相比，本文提出的分布式目标DOA估计方法对信号源的分布特性不敏感。

Based on the repetitive characteristic of the transmitted signal, a frequency domain signal model is developed. Its similarity to DOA estimation using an array and its ambiguity in parameter estimation are analyzed.

基于发射信号的周期重复性，建立了接收信号的频域模型，分析了该模型与利用阵列进行来波方向估计模型的相似性，以及该模型在参数估值时的模糊性。

Many of these species will eat a variety of bait including bucktail jigs, rubber DOA shrimp, live pilchards, squid or chunks of ballyhoo.

许多这些物种包括吃饵bucktail各种夹具、橡胶波达虾，活pilchards，鱿鱼或大块的吹嘘。

To understand the performance of DOA estimation using vector hydrophone array in a reflecting boundary, based on the reflecting model of plane acoustic wave, the improved Bartlett and Capon spatial spectrum are presented, and then the general frame is set up.

为了了解复杂分界面上矢量水听器阵列的定向性能，根据分界面上平面波的反射模型，提出了改进的Bartlett和Capon空间谱，建立了统一框架，并且在绝对硬边界典型界面下，分析了基于矢量水听器阵列的定向性能，给出了具体算例。

For the FrMVDR algorithm,the characteristic exponent value of the SαS clutter is first estimated,and then the fractional lower order output power of MIMO...

为了避免Fr MVDR算法对杂波特征指数估计，提出Inf-MVDR算法，首先用无穷范数对接收信号进行归一化处理，使归一化后的阵列输出功率有界，继而采用传统MVDR算法进行DOA估计。

Adopt the generalized maximum likelihood radio test based on the Neyman-Pearson algorithm, to study two unresolved Rayleigh targets. And deduced the detection statistic which is chi-square random variable, which only need to know the conditional probability density functions of echo's measured amplitude, in-phase and quadrature of monopulse radio, but the signal-to-noise radio and the direction-off-arrival of any signal are unnecessary.

采用基于涅曼-皮尔逊准则的广义似然比检测，对不可分辨的两个瑞利目标进行了研究，推出了服从χ2分布的检验统计量，此方法只需要知道目标回波信号测量幅值的条件概率密度函数、单脉冲和差比值的同相和正交部分，而不需要任一目标信号的信噪比和DOA的先验知识。

Based on the decomposition of the space time eigenstructure of signals,a novel wideband spectral correlation space time DOA matrix method is proposed in this paper to estimate the 2 D DOA of wideband signals .

该方法利用信号的循环平稳特性实现了对宽带信号的有效处理，同时通过空时变换将传统的一维空域处理拓展到了二维空时处理，更充分地利用了信号的时域特征，从而大大简化了阵列结构，提高了算法的性能。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了