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- ship noise line spectrum 舰船噪声线谱
- Based on the physical causes and spectral characteristics of torpedo radiated noise line spectra, this paper researches on feature extraction of torpedo target . 基于鱼雷辐射噪声的物理特性和线谱特征,探讨了一种鱼雷目标特征提取方法。
- The feature of radiated noise line spectra of underwater moving-target was extracted by the united spectra estimation method based on the traditional and modern spectra estimation. 基于经典谱与现代谱估计的联合估计法提取水下目标辐射噪声线谱特征,首先分别估计采集数据的功率谱,得到估算功率谱图;
- In addition, the envelope of ship noise waveform can be remodulated utilizing Hubert transform, and the spectrum components with line rotation frequency of propeller shaft are extracted effectively by bispectrum analysis. 另外，对于通过Hilbert变换解出的舰船辐射噪声包络进行双谱分析，有效地提取出了舰船轴频线谱。
- Estimation Method for Radiated Noise Line Spectra of Underwater Moving-Target 水下运动目标噪声线谱的联合估计方法
- Extracting line spectrum from ship-radiated noise is a key technique for identification of underwater targets in passive sonar system. 线谱是水中目标辐射噪声中重要的特征信息,在被动声呐系统中,线谱提取是水中目标识别的关键技术。
- The proposed NTTALE has the ability to handle undersea ambient noise twice, to enhance the UMT radiated line spectrum feature twice, and to track well time-varying signals. 用水下某目标辐射线谱的实测数据，对该增强器的性能进行了仿真研究。
- EMD is used here as a signal separation tool to separate the tow ship noise from the received signal. 本文尝试利用经验模式分解方法分离出水听器接收信号中的拖船干扰噪声，从而达到消除干扰的目的。
- Noise line spectra 噪声线谱
- Multipath of the towing ship noise limits the performance of adaptive interference can-celing (AIC) which utilizes the fixed beam as a reference input. 拖曳线列阵声纳中,拖船噪声常常是影响声纳性能的重要因素之一。
- Simulations show by this method we can precisely estimate time delay for narrow band and line spectrum source in low SNR. 通过计算仿真结果证明这种方法对低信噪比下窄带和单频信号具有较高时延估计精度。
- Simulation of broadband ship noise with continuous spectrum 舰船宽带连续谱噪声的模拟
- A semi-fragile speech watermarking algorithm based on speech model is researched, which is realized by quantization of line spectrum pair (LSP) parameters. 在语音产生模型的基础上研究了一种基于该模型的半脆弱性数字水印算法，通过对语音信号的线谱对(LSP)参数嵌入水印信息来实现。
- Tow ship noise is a nonstationary process with several characteristic properties, such as multi-path and angle dispersion, which greatly add the difficulty to cancel or suppress the noise. 拖曳式线列阵声纳的拖船噪声具有多途角扩展等特点，并且是一个非平稳过程，使得对该噪声的消除或抑制是一大难点。
- Of the gas. Since different gas has different set of lines, we can tell which kind of gas it is by analyzing the line spectrum. 不同的气体会产生不同的线条,就如人类的指纹,只要分析光谱上的吸收线,便可以知道光波曾经通过的气体成分。
- By DEMON we can get more and stabler line spectrum information than by LOFAR, which is to make power spectrum analysis of signal directly. Several demodulation methods are introduced and compared. 通过包络解调技术可获得轴频等调制信息,这就是常用的DEMON谱分析方法。
- The lifeboat went out to a ship in distress. 救生船去救一艘遇险的船只。
- Dynamic modulated envelops were analyzed by dimensional spectrum and modulated line spectrums achieved. 然后，利用小波变换求其功率谱从而得到辐射噪声的调制包络；
- A New Method for Feature Extraction in Ship Noise 基于多重分形的舰船噪声特征提取
- The ship steamed into the harbor. 船驶入了港湾。
