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- The method using HHT to estimate local spectral density is proposed. 本文给出了利用HHT估计地震地面运动局部谱密度的方法。
- A random signal of known statistical properties of amplitude, distribution, and spectral density. 振幅、分布及谱密度等的已知统计特性的随机信号。
- It provides a lot of accurate formulae for spectral density transforming into Allan variance. 本文推导了有限频域[f_a,f_b]中的噪声引起的修正的Allan方差公式,为噪声的谱密度变换成Allan方差提供了准确的公式。
- We analyse statistics properties of ground clutters and study AR model of correlated clutters power spectral density. 分析了地杂波统计特性，研究了相关雷达杂波功率谱特性的AR模型及其模拟方法。
- The paper analyses the signal processing with emphasis on Signal to Noise Ratio (SNR) in output of correlator and SNR in signal power spectral density. 并对算法处理中相关器输出中的信噪比（SNR）和功率谱密度中的SNR进行了重点分析。
- With the power spectral density, the vibration mechanism and the vibration transfer process of viaduct caused by the traffic load were introduced. 摘要从功率谱的角度介绍城市高架桥梁在交通荷载下产生振动的机理和振动的传递过程。
- The power spectral density of gearbox vibration signals is estimated by the periodogram from which original feature sets are derived. 为了使诊断结果更好地可视化,利用遗传编程结果的固有随机性,提取两个新特征指标。
- In practical application,one of the difficulties is the adjustment of the power spectral density function to various soil conditions. 在实际应用中,调整功率谱密度函数以适应各类场地土仍是一项困难的工作。
- Therefore, experience is needed to made good analysis.We dealt with the colonic pressure data by analyzing its power spectral density(PSD).The PSD is com... 本文对实际采集的结肠压力信号进行功率谱密度分析,并与结肠的基本功能相对照。
- This paper presents a IJF coding method based on filter shaping, and deduces IJF power spectral density adopting this method.Finally this paper simply introduce FQPSK modulation. 本文介绍基于滤波器成形法的IJF编码，并推导基于该法的IJF功率谱密度，在此基础上简要介绍了FQPSK调制体制。
- LSFRV is a stochastic process obeying Gaussian distribution whose standard deviation can be gotten by the longitudinal vibration pavement spectral density of running vehicles and the longitudinal vibration model of running vehicles. 行车纵剪力是服从正态分布的随机过程,标准方差可以通过行车纵振路面谱和车辆纵振模型得到;
- The study shows that enhancing the transmission rate of the NB system, as well as the power spectral density (PSD) of the UWB signal in the bandwidth of the NB system, will result in the higher BER of the NB system. 研究表明,提高NB系统的传输速率或增大UWB信号在NB系统的工作频带内的功率谱密度会减小NB系统的信噪比,增大NB系统的误码率。
- Wind tunnel model tests were conducted to investigate the power spectral density (PSD) and the coherence of the wind load on the CAARC standard tall building model in exposure categories B and D. 结果显示:不同高度的无因次风荷载功率谱密度具有较好的一致性;在顺风向,不同高度风荷载间的相干特性显示出指数式的衰减规律;在横风向,风荷载在漩涡脱落频率附近有很强的相关性,相干函数值接近于1。
- The process is dealing with the echo by wavelet transform, obtaining 3D-time-fre- quency distribution and power spectral density, extracting modulating spectral density, then identifying target. 对雷达回波信号进行小波变换，得到目标回波信号的三维时频分布图和功率谱密度，从中提取目标的调制谱密度，根据最小贴近度识别算法进行目标识别。
- This paper derived the recursive formula of autocovariance function and a three-stage algorithm of computing spectral density of MAR model,thus we solved spectral analysis problem of MAR model. 针对MAR模型导出其自协方差函数的递推关系式及计算谱密度的算法,从而从理论上解决了这一模型的谱分析问题。
- It is very important to study the signal to clutter ratio(SCR) and the power spectral density(PSD) of the clutter as a basis for studying the target detection in the background of clutters. 关于信杂比及杂波谱的研究对于杂波背景下目标的检测具有重要的指导意义,然而窄带雷达已有的相关理论在超宽带雷达中已经不再适用,需重新进行研究。
- It can be shown that the power spectral density matrix of velocities and/or accelerations process of water particles in stochastic waves had only one non-nil independent eigenvalue and eigenvector. 结合桥墩基础处不同深度水质点波动速度和速度的功率谱密度矩阵仅具有一个独立特征值的特点,推导了随机波动模拟的简化计算公式,简化公式具有较高的计算效率。
- The Detroit auto workers went out for higher pay. 底特律的汽车工人为争取提高工资而罢工。
- He made the best time in the auto race. 他的汽车赛中开得最快。
- double frequency spectral density function 双重频率谱密度函数
