海洋水声信道是多途、时变和频散的信道。
Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.
提出一种适合软件无线电的载波相位和频差估计算法。
An algorithm suitable for carrier phase and frequency offset estimation in software radio is proposed.
在高速实时的光交换系统中有时分、空分和频分主三种交换方式。
Three different architectures (time, space and frequency-division) are used in high speed and real time switching systems.
它主要由二次谐波产生、和频产生、差频产生、光参量振荡等构成。
It mainly consists of harmonic generation, sum-frequency generation, difference-frequency generation, optical parametric oscillation and etc.
结果表明，用该算法可以精确估计载波相位和频差，有效地降低系统的误码率。
The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
SFPB作为一种阿秒超快调制过程，从理论上说它可以扩展到任何和频能级系统。
As an attosecond ultrafast modulation process, SFPB can be extended intrinsically to any sum-frequency of energy-levels.
因而该方法具备了相差法检测灵敏度高和频差法受被测流体声速变化影响小的特点。
So this technique has high sensitivity which phase difference method has and is hardly affected by the variation of the sound speed of the fluid, just as frequency difference method is .
本警示灯接上电源后经变压器和频闪器控制可发出有节奏的三角形警示图案的红光。
After the neon warning lamp is connected with a power supply, the neon warning lamp can send out rhythmic triangular warning red light with a pattern under the control of a transformer and the strobe.
综合对比这些结果，可用于地层岩性解释、分析吸收和频散作用、以及分辨多次波等。
Integrated analysis of these results is helpful to strati - graphic interpretation, the analysis of absorption and frequency dispersion, the identification of multiple reflection, and so on.
船舶修造行业是发生安全事故较多的行业之一，本文主要总结了事故的特点和频发原因。
The industry of ship repair and building is characterized in safety incidents. This article sums up the characteristics of the incidents and analyzes the causes.
对聚烯烃粉体生产工艺过程中典型和频发性的静电放电火花的点燃危险性进行了定量评价。
In the production line of polythene and polypropylene powder, the ignition risk caused by typical and frequently occurred ESD sparks has been quantitatively assessed.
研究了级联三能级系统中孪生色锁随机光场的相位共轭阿秒和频极化拍频(ASPB)不对称新效应。
The new effects of phase-conjugation asymmetric attosecond sum-frequency polarization beat (ASPB) of twin composite color-locking stochastic fields in cascade three-level system are investigated.
目前，该波段的全固态激光光源主要是利用频率变换技术，通过倍频、和频、受激拉曼频移的方法来获得。
Presently, an all-solid-state laser in this spectral range was obtained by frequency conversion, such as frequency-doubling, sum frequency, stimulated or Raman frequency-shifted.
对黄光激光的产生方式进行了讨论，重点介绍两种获得黄光激光的非线性光学方法：和频和受激拉曼散射效应。
Different ways to generate yellow laser were discussed, especially two nonlinear-optical methods of sum-frequency mixing and stimulated Raman scattering (SRS).
目前，卫星干扰源时延和频移定位参数的估计主要采用基于相关原理的互模糊函数算法(CAF)进行联合估计。
At present, the joint estimation methods of time delay and frequency shift for satellite interference localization are mainly based on the principle of correlation, such as CAF algorithm.
在导波传播理论和频散波形预测理论的基础上，研究了超声导波在检测管道时，如何利用时域波形重构缺陷图像的问题。
Based on the ultrasonic guided wave technique and the dispersive waveform prediction method, a method about how to image defects in pipes is presented.
进行了双束激光和频相位匹配的理论分析，给出了KTP和LBO 两种晶体在和频时的最佳相位匹配角和有效和频系数。
The phase matching conditions for sum frequency generation are analyzed. The optimum phase matching angles and effective nonlinear coefficients for KTP and LBO are derived and calculated.
通过理论分析和数值模拟研究了在双脉冲泵浦情况下的级联和频与差频的二阶非线性效应，探讨了走离效应对波长转换的影响。
Through theoretical analysis and numerical simulations, the walk-off effect between sum-frequency pulse and pump pulse caused by Group Velocity Mismatch (GVM) was discussed.
拉尼娜现象的增强和频发及在最近几十年中其温暖天气的对应物厄尔尼诺现象强烈暗示着由于全球变暖而与更为温暖的海洋温度有联系。
The increased intensity and frequency of La Nia and its warm weather counterpart El Nio in recent decades strongly suggests a link to warmer ocean temperatures as a result of global warming.
这份即将于下月发表的报告指出，气温的升高和恶劣天气的频发，这都提高了人类暴露于污染物质之下的程度。
The study – due to be published next month – says rising temperatures and more extreme weather are increasing human exposure to pollutants around the world, including in Britain.
色彩斑斓的照片合成了用三架不同望远镜拍的窄频和宽频图像。
The gorgeous color image combines both narrowband and broadband images recorded using three different telescopes.
饱受争议的并购，频发的管理层丑闻和战略的不断反复已让客户、员工和股东都精疲力竭。
Hotly debated mergers and acquisitions, executive scandals and reversals of strategy have worn on customers, employees and shareholders alike.
多亏了海地，智利和新西兰地震，以及深水石油爆炸泄漏事件，这些使得去年成为了灾难频发的一年。
Last year was catastrophe-strewn, thanks to earthquakes in Haiti, Chile and New Zealand, as well as an explosion at the Deepwater Horizon oil rig.
微波晶体管激光模型可以非常准确的预测频变电和光的属性。
The microwave transistor laser model is very accurate for predicting frequency-dependent electrical and optical properties.
利用智利的天文望远镜，天文学家测量了三裂星云中气体的多普勒频移和速度。
By using telescopes in Chile, the astronomers measured Doppler shifts and thus velocities of gas in the Trifid.
在一项新研究中，科研人员推断亨利八世的X染色体遗传障碍和罕见血型是导致其状况频发的罪魁祸首。
In a new study, researchers propose that Henry had an X-linked genetic disorder and a rare blood type that could explain many of his problems.
一些气候学家相信，这种恶性循环会加剧亚洲的降雨量，导致孟加拉国、缅甸这些地方暴风雨和洪水灾难的频发。
Some climatologists believe this warming feedback loop could intensify the Asian monsoon, triggering more violent storms and flooding in places such as Bangladesh and Myanmar.
LTE则利用频分多路传输系统把频道分成两个部分，所以，下载和上传的速度得以更好地平衡。
LTE splits the channel into two parts using frequency-division multiplexing, so the download and upload speeds are better balanced.
海洋温度上升、海水污染、海水变酸和飓风频发将大量的珊瑚漂白。
Rising ocean temperatures, water pollution, ocean acidification and cyclones continually pummel the reef and have caused mass coral bleaching.
美洲以灾害频发出名，但今年并未经历像日本三重悲剧那样的打击。日本大地震和海啸迅速成为该国有史以来最昂贵的自然灾害。
The Americas are notoriously disaster-prone, but the region has been spared the scale of Japan's triple tragedies, which quickly became the most costly natural disaster on record.
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