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signal相关的网络例句

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The main job and contribution of this paper are as follows:Based on narrowband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, compute the cross-correlation function of FH signals from multichannels, then we get the cross power spectral density matrixCSDM Secondly, select the hops of FH signals from the CSDM via processing and analyzing the CSDM, meanwhile reduce the influence coming from noise, fixed frequency signal and other interferences; Lastly, estimating the DOA of every hop and according to the DOA, we can separate the hops, get the number of FH signals and their parameters. Propose a new method for designing the threshold in FH signal detection. This method makes it easy to get the threshold by theoretic computing and it can extremely reduce the interference of non-FH signals.Based on broadband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, get the DOA of the signals by wideband spatial spectrum estimation; secondly, separate the signals by spatial filtering using wideband beamformer; Lastly, we propose two methods for FH signal blind detection and blind parameter estimation, one is for several constant hop-rate FH signals whose dwell-time are different and another is for a single FH signal whose hop-rate is alterable.By employing spatial interpolation in broadband signal beamforming, it can reduce the number of antenna elements and corresponding RF modules, A/D converters, etc. It can also eliminate the mutual coupling between antenna elements while getting the narrower main beamwidth and lower sidelobe level.

本文的主要研究工作和贡献如下:●提出了一种基于窄带处理的FH信号盲检测和参数盲估计的实现方法,即首先求出多路信号之间的互相关,进而得到互功率谱密度矩阵,然后通过对CSDM进行对折处理来抑制噪声、定频信号及其他干扰的影响,并将所有属于FH信号的hop(每一跳的驻留时间在时频图上持续的线段)从CSDM中筛选出来,最后用阵列信号处理中的到达方向估计理论在频域中估计出各个hop的方向参数,利用方位信息完成FH信号分离并得到FH信号的数目及其各自的参数集;●提出了一种确定FH信号检测门限的策略,该策略不仅使得检测门限能够通过理论计算得到,而且还显著地抑制了非跳频信号的干扰,从而能有效地检测出FH信号;●提出了一种基于宽带处理的短波FH信号盲检测和参数盲估计的实现方法,即首先利用宽带空间谱测向技术得到接收信号的DOA,然后采用宽带波束形成技术对特定方向进行空间滤波,实现多个信号的分离,最后分别提出了两种FH信号的盲检测和参数盲估计方法,第一种方法适用于空间某个特定方向上存在着几个驻留时间不同的恒跳速FH信号和其他干扰信号的混合信号,第二种方法适用于空间某个特定方向上仅含一个可变跳速的FH信号和噪声的混合信号;●将空间插值的概念和宽带波束形成技术结合起来,提出了一种基于频域处理的宽带恒定束宽的波束形成方法。

According to a study by psychologist Eric Bressler of Westfield State College in Massachusetts and Signal Balshine, an associate professor of behavioral ecology and evolution at McMaster University in Ontario, both men and women were attracted to people with a sense of humor.

美国马萨诸塞州威斯尔德州立学院的心理学家Eric Bressler和加拿大安大略省麦克马斯特大学的行为生态学和进化学副教授Signal Balshine在研究中发现,无论男女都会被具有幽默感的人所吸引。

The Signal can analyze the credibility,safety and boundness of hybrid systems with the clocks consequence.It can not only intuitively show all kinds of variables in the restrictive relation,but also obtains the temporal characteristic of a system using a homomorphism.

Signal语言是一种同步语言,它通过时钟推理机制来反映复杂系统的确定性、安全性、有界性等问题,能够直观地表示系统元素之间的约束关系及特性,通过构造同步实时评估模型来反映系统的实时性。

The results show that,all the three methods can effectively correct the frequency,the energy centrobaric correction has the lowest precision,and the ratio correction is the fastest and its precision is almost not affected by the change of signal-to-noise ratio.

标 签 信号处理激光多普勒测速仪离散频谱校正快速傅里叶变换 signal processing laser Doppler velocimeter discrete spectrum correction fast Fourier transform

Aiming at the two main disadvantages of the MUSIC (Multiple Signal Classification Algorithm) method, longer computing time and the adverse effect of issuable false peaks to the fault detection, the corresponding solution methods is proposed.

针对MUSIC(Multiple Signal Classification Algorithm)算法用于故障诊断的两大缺点:运算量大和可能产生的虚假波峰对故障特征的混淆带来的不利影响,给出了相应的解决方法。

Investment bank Signal Hill Capital Group analyst Tuode Ge Lin Wode said that this is not a zero-sum game.

投资银行Signal Hill Capital Group的分析师托德。格林沃德说,这并非是一场零和游戏。

But investment bank Signal Hill Group senior analyst Tuode Ge Lin Wode that Google new products in depth and not on the accuracy of Nielsen and comScore or similar products, Nelson is the main comScore Competitors,"comScore tracking the world's millions of users surfing habits, master of the user's age, gender, geographic location and very valuable demographic information, this is their courage to charge high costs of capital."

但投资银行Signal Hill集团的高级分析师托德格林。沃德认为,谷歌新产品在深度和准确性上都不及comScore或尼尔森的类似产品,尼尔森是comScore的主要竞争对手,&comScore跟踪了全球数百万用户的上网习惯,掌握了用户的年龄、性别、地理位置及非常有价值的人口统计资料,这也是他们敢于收取高昂费用的资本。&

Mr Power's memoir struck a chord with many readers when it was first published in 1984, which may be why Signal is reissuing it in a special series devoted to classic travel writing and entitled "Lost and Found".

鲍尔先生的回忆录在1984年初次发行时便触动了众多读者的心弦,大概因此,Signal出版社如今将之列入经典游记特别丛书再度发行,重名为&失落与寻回&。

OBJECTIVE: To explore the expression and significance of signal transducers and activators of transcription 3(STAT3) in laryngeal squamous cell cancer.

目的: 研究信号转导与转录活化因子3(signal transducers and activators of transcription 3, STAT3)在人喉鳞状细胞癌组织中的表达,探讨其在喉癌发生发展中的作用。

Mechanical strains also regulated the protein and mRNA expression of several differentiation markers, as well as the activation of extracellular signal-regulated kinases, p38 MAP kinase and protein kinase B in a frequency-dependent manner. Furthermore, the inhibition of p38 pathway could block the strain-frequency induced the phenotype modulation of VSMCs, neither ERKs nor Akt. Frequency of mechanical strain, not conditioned medium, regulated the phenotype of VSMCs in a frequency-dependent manner. Rho-GDI alpha was suppressed by the mechanical strain at 1Hz.

采用免疫细胞化学法检测VSMCs形态和排列的变化;RT-PCR和Western blotting检测表型标志分子α-肌动蛋白、肌球蛋白重链(SM1/2)、肌动蛋白相关蛋白SM22α和调宁蛋白(h1-calponin)的mRNA和蛋白水平的变化;抑制剂或RNA干扰阻断可能的信号调节分子的活性或表达,包括p38、细胞外信号调节激酶1/(2extracellular signal-regulated kinases, ERK1/2)、蛋白激酶B和Rho-鸟苷酸解离抑制因子(Rho-guanine nucleotide dissociation inhibitor, Rho-GDI alpha),研究了不同频率张应变对VSMCs表型转化的影响及其调节机制。

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