| 1. | Echo waves and their stability in linearly coupled oscillators
线性耦合振子中的回声波及其稳定性 |
| 2. | According to the principle of ultrasound detection , this thesis describes a high - speed sampling system for ultrasound emergent wave and echo wave
摘要根据定量超声波检测原理，阐述了一种针对超声波发射信号和回波信号的高速采集系统。 |
| 3. | The propagation velocity of ultrasound in patient ' s shinbone can be achieved by figuring out the time span between emergent wave and echo wave
根据相关公式，只需计算出超声波发射信号和回波信号的时间差，即可获得定量超声波在受试者胫骨的皮质骨中传播速度。 |
| 4. | High frequency ground wave radar for near ocean inspection and ocean remote sensor is a method that use ocean echo wave dopier spectrum to deduce the parameters of ocean situation
高频地波雷达近海监测和海态遥感技术是一种利用海洋回波多普勒谱反演海态参数的方法。 |
| 5. | In addition , the article also proposed two kinds of method to achieve phase difference between echo waves with doppler shift to increase its precision of angle measurement
此外,文中还提出了信号回波多普勒频移影响下的两种相位差提取方法,以提高短基线干涉仪角度测量精度。 |
| 6. | Owing to the complexity of the on - line methods and the diversity of the form of radar echo wave , there are n ' t many people who have paid much attention to this question of on - line calibrating
在线算法不需要测试信号且可以实时地对误差模型进行跟踪，有着良好的应用前景，但由于其实现的复杂性、雷达回波信号的多样性，使得人们极少涉及这个领域。 |
| 7. | First of all , this paper introduces the whole design project and interrelated knowledge about non - destructive detection , ultrasonic detection , and phased - array ultrasonic detection then the paper depicts the principle of phased - array focus and abstracts a set of math model and feasible arithmetic on the base of the real parameter of the system . put forward several problems that exist during the course of system development and program . introduce some measures of distinguish that are often used in non - destructive detecting and echo wave crest
然后在文中以较大的篇幅，描述了相控阵聚焦的原理，并根据该系统的实际参数，抽象出一套数学模型和可行的算法，在此基础上提出了在系统开发过程及编程实现过程中存在的一些问题；介绍了在无损检测中缺陷的分类和对回波峰常用的识别方法，详述了系统开发过程中使用的其中一种识别方法，即判别是否存在缺陷的算法，并给出实现之的部分核心程序；详述主控程序如何控制各部分并协调各相关软件的工作，使整个系统发挥最高效能，并给出主要设计框图和程序。 |
| 8. | Then echo wave simulation is used to examine the model , because echo wave simulation is one of the effective ways to evaluate the propagation theory . therefore , we can model the echo wave of the pavement structure that we have already known and compare it to the actual wave . if they do not match very well , we can adjust some parameters to improve it
模型建立的是否正确，用正演模拟进行检验，因为正演模拟是研究高频电磁波在地下介质中传播规律的有效途径，具体做法为：利用已建好的模型模拟计算雷达回波，将模拟的波形与实测波形进行对比以检验模型建立的是否正确、是否满足精度要求，从而达到检验已建模型的目的。 |
