In this paper,a feature extraction method of modulation continuou spectrum is studied,and then the classification experiment for three different classes of targets is done by exploiting neural network target classifier based on genetic-backpropagation algorithm,results of experiment show that the passive sonar target recognition system designed in the paper has higher correct classification rate.
针对被动声纳目标识别,着重研究了一种调制连续谱特征提取方法,并采用自适应遗传BP算法的神经网络分类器对海上实录的三类目标噪声进行了分类识别,实验结果表明该被动声纳目标识别系统具有很好的分类效果。
Because of the limitation of the F-P interferometer for the analysis of a CW laser modulation spectrum,an optical beat frequency method is proposed,which can be used to measure the spectrum with a modulation frequency ～kHz.
针对F-P干涉仪分析连续激光调制光谱的局限性,本文提出了一种基于光拍频的连续激光调制光谱的测量方法,该方法可实现调制频率低达千赫兹的连续激光调制光谱的测量。
The propagation about radiating noise from vessels is studied in this paper, continuous spectra model, line spectra model and modulated spectra model are established.
在研究舰船辐射噪声特性的基础上,对其连续谱、调制包络、线谱、声源级及多普勒频偏进行了建模与仿真,连续谱采用FIR滤波方法仿真,调制包络由高斯脉冲串组成,对舰船辐射噪声随距离、速度、方位变化的动态特性进行模拟。
The results show that the spectra of laser-induced plasmas for the three kinds of gas samples are composed of continuous spectra and line spectra, the basic features of the continuous spectra and line spectra were given, the possible connection.
结果表明 ,各种气体样品的激光等离子体光谱均表现为连续谱和线状谱的叠加 ,文中分别给出了连续谱和线状谱的基本特征 ,讨论了这些特征与等离子体物理特性的关系 ,并分析了纯氮、纯氧与空气激光等离子体光谱之间的异同。
The continuous spectraum part is .
同时 ,为把连续谱考虑在内 ,引入一虚假深海底 ,用复模式和来近似计算分支割线的贡献。
Supercontinnum Generation in Photonic Crystal Fiber by Using Quasi-Continuous Pump
准连续光抽运光子晶体光纤产生超连续谱
Correction of Hardening of Energy Spectrum and Scattering for Continuous Spectrum X-ray ICT;
连续谱X射线在ICT中的能谱硬化与散射修正
The concept of a continuous spectrum is obviously unmanageable graphically.
连续谱的概念显然用图形无法表达。
Continuous spectra are appropriate to the clash of cymbals.
连续谱适合于描写钹的碰撞声。
The angular part of a continuum wave function is, of course, a spherical harmonic.
连续谱波函数的角度部分当然是球谐函数。
The Research on Supercontinuum Generation in Photonic Crystal Fibers by Optical Pulses;
光脉冲在光子晶体光纤中产生超连续谱的研究
Study of Supercontinuum Source Based on Mode-locked Fiber Laser;
基于锁模光纤激光器的超连续谱光源研究
Research and Application of Photonic Crystal Fibers in Supercontinuum Generation;
光子晶体光纤分析及其在超连续谱中的应用
Studies of Passively Mode-locked Fiber Laser and Supercontinuum Generation;
被动锁模光纤激光器和超连续谱产生的研究
The Numerical Study of Supercontinuum Generation in Photonic Crystal Fiber;
光子晶体光纤中超连续谱形成机制的理论研究
Even Er Isotopes in Relativistic Continuum Hartree-Bogoliubov Theory;
相对论连续谱Hartree-Bogoliubov理论对Er偶同位素链的研究
continuous scanning Fourier spectroscope
连续扫描傅里叶光谱仪
continuous wave NMR spectrometer
连续波核磁共振波谱仪
Non-Periodical Time Function Consists of Time Harmonics with Continuous Frequency Spectrum.
非周期时变由连续频谱之弦波所构成。
CONTINUOUS DETERMINATION OF Zn, Fe, Mn, Cu, Pb, AND Cd WITH POLAROGRAPHIC CATALYTIC METHOD
极谱催化波法连续测定锌、铁、锰、铜、铅、镉
Spectra Analysis of Analog Signal Using FFT;
利用FFT对连续信号进行频谱分析
Spectral mapping theorems for bi-continuous N-times integrated C-semi-groups
双连续n次积分C-半群的谱映照定理
STUDY OF IODINE MOLECULE FLUORESCENCE SPECTRA IN?CAVITY OF A CW CHEMICAL OXYGEN-IODINE LASER
连续波氧碘化学激光器腔内碘荧光光谱研究