高频

The acquisition of signal and several processing methods for Laser Doppler signal are introduced in chapter 4, and the Short-time Fourier Transfer method are tried to process the high frequency, wide bandwidth, wide dynamic range and nonstable signal of this system.

第四章介绍了对信号的采集和几种常用的多普勒信号处理方法，并根据本系统信号的高频、宽带、大动态范围、非平稳的特点，提出了采用短时傅立叶变化的方法来对信号进行处理，从而得到振动位移的变化情况。

Statistic analysis on IR image characteristics shows that IR target has relatively more and larger regions which are of same quality, mainly expressed by smooth images and by that the energy distribution is concentrated on low frequency band in L〓 linear normed space, while large quantity of background regions show as texture images and their energy in L〓 space is concentrated on high frequency band. Based on this difference, the IR target segmentation method on the basis wavelet transformation is proposed.

通过对红外图像特征的统计分析证明，红外目标含有较多较大的同质区，主要表现为平滑图像，在L〓线性赋范空间的能量分布集中在低频，而大量的背景区域表现为纹理图像，在L〓空间中能量集中在高频部分，根据这一差别，提出了一种基于小波变换的红外目标分割方法。

The setting of excitation source is introduced. Numerical stability is discussed.

表明时域有限差分方法是计算高频电磁波测井响应时是有效的。

If the expensive factory adopt oxygen , oast , salt bath furnace and coal stove etc. to heat a means, ask you to choose usage LW series high frequency induced warmup equipment.

如果贵厂采用氧气、烘炉、盐浴炉及煤炉等加热手段，请您选择使用LW系列高频感应加热设备。

The experiment mainly includes the tests of the open resonators and the experimental tube.

实验部分则包括高频腔体的测试和实验样管的测试。

The operating ambient temperature of high-frequency generator should be lower than 60℃.

高频发生器必须与本公司生产的同功率灯泡配套使用。

In this paper, the Maslov theory was introduced. By τ-p transform, seismic data is transformed from space to ,〖WTBX〗 and phase ( p s, p r ,τ) space. Then it is combined with Born inversion, and deduce the high-frequency asymptotic solution of migration operator amplitude in phase domain.

引人Maslov理论，利用τ-p变换将数据从空间分别变换到和及( p s ， p r ，τ)空间中，并将其结合到Born反演中，推导出了相空间偏移算子振幅的高频渐近解。

Based on this, a new WENO difference scheme which based on Dispersion-Relation-Preserving relation is developed, and representative test cases with this scheme for computational aeroacoustics problems has been implemented and compared in order to test capability of wave capturing; In addition, WENO schemes generally do not converge at high order in the presence of contact discontinuity of Euler equations, so a conservative front tracking technique coupling WENO schemes and Level Set method to simulate the translating density profile is presented here, and numerical simulation with this technique for representative test case has been implemented and results show the desired accuracy.

本文研究了高阶精度加权基本无振荡格式及其在双曲守恒律方程中的应用，在此基础上作了两个方面的工作：一是针对高频声波问题构造出一种基于保色散关系的WENO有限差分格式，并对计算气动声学问题的代表性算例进行了大量数值实验，比较了该格式捕捉波数的能力；另外，针对高阶WENO格式在处理Euler方程的接触间断时精度有所降低的问题，研究了利用界面追踪技术Level Set方法和高阶激波捕捉WENO格式相结合的一种守恒追踪方法，并且给出有代表性的密度滑移面问题的算例，得到一致高阶精度的数值模拟结果。

The every frame image was transformed by dyadic discrete wavelet and the characteristic of wavelet transform coefficient was analyzed. Low frequency coefficients were analyzed by fast principal component method which quoted Gram-Schmidt orthonormalization procedure in fixed-point algorithm then distilled principal component and reconstructed the low frequency coefficients. To suppress image noise, the high frequency coefficients were equated to zero.

该算法对热图像序列中的每帧图像进行二进制离散小波变换，提取出低频部分的系数；对低频系数进行改进PCA分析，通过固定点算法并引入Gram-Schmidt正交化过程求解特征向量；令高频系数为零，抑制图像的噪声。

It's very important to process digital orthorhombic demodulation.

对接收到的高频信号进行全数字正交相干检波是十分重要的，它保留了信号复包络的完整信息，包括振幅和相位，因此可以很好的提取有用信号，对其进行后续处理；在匹配滤波器理论指导下提出的人们提出了脉冲压缩概念，脉冲压缩体制较好的解决了作用距离和分辨力之间的矛盾实现了提高雷达距离分辨力的要求。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。