FFT

超导磁储能系统抑制风力发电功率波动的研究(Research on the applica tion of superconducting magnetic energy storage un it to damp wind genera tion power fluctua ting)

matlab code for getting data from a file

核方法工具箱，包括核典型相关分析KCCA，KPLS等算法的源码和实现。(Kernel Methods Toolbox KMBOX includes implementations of algorithms such as kernel principal component analysis (KPCA), kernel canonical correlation analysis (KCCA) and kernel recursive least-squares (KRLS). )

关于滤波器性能的各种转换 帮助菜鸟在较短时间内精通滤波器性能的MATLAB表示(About the performance of a variety of conversion filter to help rookie proficient in a relatively short time the performance of MATLAB filter express)

可以得到很精确的幅值、频率、相位估计，是学习PCA特征提取的很好的学习资料，合成孔径雷达（SAR)目标成像仿真，有均匀线阵的CRB曲线，匹配追踪和正交匹配追踪，对信号进行频谱分析及滤波，模式识别中的bayes判别分析算法。 ( You can get a very accurate amplitude, frequency, phase estimation, Is a good learning materials to learn PCA feature extraction, Synthetic Aperture Radar (SAR) imaging simulation target, There ULA CRB curve, Matching Pursuit and orthogonal matching pursuit, The signal spectral analysis and filtering, Pattern Recognition bayes discriminant analysis algorithm. )

先进的PID控制，PDF的电子书加源码，可以对学习PID的朋友有所帮助(Advanced PID control, PDF e-book plus source code, can help a friend learn PID)

随机产生m序列 即产生伪随机数 又叫做伪随机序列、伪噪声(PN)码或伪随机码。(M sequence that is randomly generated pseudo-random number generation, also known as pseudo-random sequence, a pseudo-noise (PN) code or pseudo-random code.)

正交频分复用(OFDM)技术是一种可以有效对抗符号间干扰(ISI)的高速数据传输技术。OFDM是一种特殊的多载波调制方式，它的基本思想是将高速传输的数据流通过串/并转换，变成在若干个正交的窄带子信道上并行传输的低速数据流。OFDM接收机有三个关键技术：信道估计技术，降低峰均比(PAPR)技术和同步技术。OFDM技术能有效的对抗多径衰落等，有着诸多的优点，但是OFDM有一个发展瓶颈，即OFDM信号的峰均功率比很大，很容易导致OFDM信号的交调失真和系统性能的下降。因而如何降低OFDM信号的峰均功率比一直是OFDM技术的一个研究热点问题。论文针对上述问题，重点研究了降低OFDM信号的峰均功率比的SLM与PTS算法，并利用Matlab对算法进行了仿真研究，并对仿真结果进行了分析。(Orthogonal frequency division multiplexing (OFDM) is a high-speed data transmission technology that can effectively combat inter-symbol interference (ISI). OFDM is a special multi-carrier modulation method, its basic idea is to high-speed transmission of data stream through the serial/parallel conversion, in a number of orthogonal narrowband sub-channel parallel transmission of low-speed data stream. OFDM receivers have three key technologies: channel estimation techniques, reduced peak-to-average ratio (PAPR) techniques and synchronization techniques. OFDM technology can effectively combat multipath fading, etc., there are many advantages, but OFDM has a bottleneck in development, that is, OFDM signal peak power ratio is large, it is easy to lead to OFDM signal intermodulation distortion and system performance degradation. Therefore, how to reduce the peak-to-average power ratio of OFDM signal has been a hot topic in OFDM technology. In this paper, the SLM and PTS algorithms for reduc)

采样频率 fs=10000 轴承外环故障信号 fid=fopen( bearingout.dat , r ) 故障 N=1024 xdata=fread(fid,N, int16 ) fclose(fid) xdata=(xdata-mean(xdata))/std(xdata,1) 时域波形 figure(1) plot(1:N,xdata) xlabel( 时间 t/n ) ylabel( 电压 V/v ) db10小波进行4层分解 一维小波分解 [c,l] = wavedec(xdata,4, db10 ) 重构第1～4层细节信号 d4 = wrcoef( d ,c,l, db10 ,4) d3 = wrcoef( d ,c,l, db10 ,3) d2 = wrcoef( d ,c,l, db10 ,2) d1 = wrcoef( d ,c,l, db10 ,1) ( Sampling frequency fs = 10000 bearing outer ring fault signal fid = fopen (' bearingout.dat' , ' r' ) failure N = 1024 xdata = fread (fid, N, ' int16' ) fclose (fid ) xdata = (xdata-mean (xdata))/std (xdata, 1) time-domain waveform figure (1) plot (1: N, xdata) xlabel (' Time t/n' ) ylabel ( ' voltage V/v' ) db10 wavelet decomposition 4 layer one-dimensional wavelet decomposition [c, l] = wavedec (xdata, 4, ' db10' ) 1 ~ 4 reconstructed detail signal d4 = wrcoef (' d' , c, l, ' db10' , 4) d3 = wrcoef (' d' , c, l, ' db10' , 3) d2 = wrcoef (' d' , c, l, ' db10' , 2) d1 = wrcoef (' d' , c, l, ' db10' , 1) )

该程序用MATLAB实现了目标的跟踪，它是静态背景为核心的。(Realize the target tracking)