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ann
基于神经网络之中的BP算法的matlab仿真(Based on the BP neural network algorithm matlab simulation)
- 2009-07-08 18:54:57下载
- 积分:1
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Tap-46
Pedagogy Pedagogy Pedagogy
- 2011-04-21 01:38:15下载
- 积分:1
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03607_28
DFT进行频谱分析时的三种现象
1、混叠:对连续信号采样,要求连续信号是带限的,采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏:DFT对时域信号进行了截断(相当于采样信号乘了一个窗函数),时域的乘积相当于频域卷积,改变了原信号频谱。
改用其他窗函数(非矩形)改善泄漏。
3、栅栏现象:DFT 只给出了频谱在采样点上的取值,采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)
- 2007-05-08 16:22:17下载
- 积分:1
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circ_dw
相控阵天线阵列的密度加权matlab程序代码。
运行gui.m文件
lmax.m和lmin.mLinear_func.m最后几行被调用,放在和Linear_func.m路径相同的文件夹下即可
运行后command window里第一条分割线上面是第一幅图的几个值,第二条分割线上面是第二幅图的几个值。其中,peak_first是数值最大的峰值,peak_second是数值第二大的峰值(第一旁瓣),theta_var是与
peak_first最近的左右两个谷值横坐标的距离。
因为是找半峰值点的,因为都是小数,在数组里没有正好等于主瓣幅值一半的点,只有接近一半的点,所以要设定一个范围比如大0.05或小0.05都认为是半峰值,但是有的数组里0.05的范围还是太小,所以可能报错。(Phased array antenna array the density weighted matlab program code. The last few lines of the run gui.m the file lmax.m lmin.mLinear_func.m call, same placed Linear_func.m path folder above the dividing line of the command window to run the first picture the several values above the dividing line several values of the second image. Wherein, peak_first numerical maximum peak the peak_second is the the numerical second largest peak (first sidelobe), the theta_var is the abscissa and peak_first recent about two valley distance. To find half the peak point are decimal, the array does not just equal to main lobe amplitude half points, only nearly half points, so you want to set a range, such as 0.05 or 0.05 are considered semi-peak some array, but the range of 0.05 or too small, it may be an error.)
- 2013-02-26 19:21:18下载
- 积分:1
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Wavelet-tutorial
这是我见过的最好的小波教程,对于小波学习很有帮助,通俗易懂。(This is the best I' ve ever seen wavelet tutorial, for wavelet study helpful, easy to understand.)
- 2012-11-14 22:17:11下载
- 积分:1
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signal_fft_spectrum
用matlab产生不同的波型,对其进行FFT 功率谱,对数谱然后用IFFT进行反变换(Using matlab produce different wave type, its FFT power spectrum, the spectrum and then use the IFFT to inverse transform)
- 2008-01-19 17:50:55下载
- 积分:1
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lms_nlms_rls_by_matlab
本文件包括了关于自适应滤波器matlab实现的主流模拟仿真,其中包括lms,nlms,rls等等,供交流经验(This document includes the adaptive filter on matlab simulation to achieve the mainstream, including the lms, nlms, rls, etc., for exchange of experience)
- 2009-05-09 12:52:18下载
- 积分:1
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9414v06_Image_Proc_Toolbox
Perform image processing, analysis, and algorithm development
- 2010-02-20 03:11:35下载
- 积分:1
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123
基本matlaB题目解答仿真代码,包括图形处理,高等数学函数解答,动画演示(Answer basic questions matlaB simulation code, including graphics, advanced math functions to answer, animated)
- 2011-05-21 09:49:41下载
- 积分:1
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CG_ex
共轭梯度发法matlab版本的一个实例源代码,带轨迹收敛图(a source code of conjugate gradient algorithm by matlab )
- 2013-10-27 16:47:48下载
- 积分:1