有哪些信誉好的足球投注网站- 1、本文档共66页，可阅读全部内容。
- 2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
- 3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
查看更多
上海交通大学微弱信号检测Detectionofweaksignal2-Fundamental Concepts of Noise
* Fundamental Concepts- Detection of Weak Signals * 2.3.4 cross-power spectral density（互功率谱密度） By definition, the cross-power spectral density of two stationary processes（稳态过程） is the Fourier transform of their cross-correlation function * Fundamental Concepts- Detection of Weak Signals * 2.3.4 Linear System Assume a linear, lumped, time invariant system（时间不变系统） whose transfer function is H(j). input fluctuation x(t), with known mean and spectral density Sf(x). The spectral density of the fluctuation y(t) obtained at the output is Sf(y) The autocorrelation function is the inverse Fourier transform of Sf(y) * Fundamental Concepts- Detection of Weak Signals * 2.4 Summary Average provides an insight with a constant Rms can be interpreted as a DC voltage , generating same heating with the noise. Almost all noise voltages or currents have a PDF with a Gaussian distribution. Wiener-Khintchier theorem ( autocorrelation and the power spectral density are related by a Fourier transform). * Fundamental Concepts- Detection of Weak Signals * 2.5 Class discussion Please write down five concepts in this chapter according to their importance. For the theories learned so far, please give the conditions which theory is preferred. If you wish to construct a new theory to deal noise, what will be your first step? Why? * Fundamental Concepts- Detection of Weak Signals * 2.3.1 One Random Variable Cumulative distribution function(累积分布函数，CDF) is defined as the probability at instant t1 is less than some specified value x1. * Fundamental Concepts- Detection of Weak Signals * 2.3.1 Averages, variance, standard deviation The first formula is the N-th order average (n-th order moment矩) The most often encountered averages are m1 and m2. The second formula is called variance(方差). The third derivative is called standard deviation(标准偏差). * Fundamental Concepts- Detection of Weak Signals * 2.3.1 Physical Meaning for ergodic processes The mean value: DC component The square of the first order
文档评论（0）