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用Welch法进行功率谱估计
考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。(consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power)
- 2005-07-12 11:18:13下载
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TT
说明： The model used for creating the reference voltage is shown
in Fig. 4. First, photovoltaic output current (Ipv) and output
voltage (Vpv) are passed through a first order low pass filter
with a magnitude of G = 1 and a time constant of T = 0.01
seconds in order to filter out the high frequency components
or harmonics from these signals as shown in Fig. 5 and Fig. 6.
The filtered current and voltage signals (Ipv_F and Vpv_F) are
then fed into the MPPT control block that uses the Incremental
Conductance Tracking Algorithm. An algorithm that is based
on the fact the slope of the PV array power curve shown in
Fig. 7 is zero at the Maximum Power Point (MPP), positive on
the left of the MPP, and negative on the right. The MPP can
thus be tracked by comparing the instantaneous conductance
(I/V) to the incremental conductance (∆ I/∆ V) [11] as in (1):
- 2013-07-23 17:46:57下载
- 积分：1
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xishutu
对复小波提取高频及低频的系数 并对相应的实小波的系数也进行了提取(Extraction of complex wavelet coefficients of high frequency and low frequency
And the corresponding real wavelet coefficient were extracted
)
- 2011-06-20 22:12:36下载
- 积分：1
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book-finite-differnce-for-ode-and-pde
a good book on numerical pde and its miles !
- 2011-09-27 21:33:40下载
- 积分：1
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egc-mrc
三种分集增益，最大比合并，选择合并，等增益合并(equal gain combining-spatial diversity )
- 2020-11-05 16:19:52下载
- 积分：1
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quadratic-programming
二次规划法用拉格朗日方法求解等式约束二次规划和用有效集方法解一般约束二次规划问题(Quadratic Programming Lagrangian method for solving equality constrained quadratic programming and the use of efficient collection method for solving general constrained quadratic programming problems)
- 2021-04-05 16:29:03下载
- 积分：1
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GardnerForMatlab
BPSK gardner同步 同步算法仿真。此m文件把Gardner算法的信号生成到发送，接收及同步一并给出。-Gardner Synchronization Algorithm Simulation. This m file to Gardner algorithm to generate a signal to send, receive and be given simultaneously.(BPSK gardner Sync synchronization algorithm simulation. This m file to generate the signal Gardner algorithm to send, receive, and be given simultaneously.-Gardner Synchronization Algorithm Simulation. This m file to Gardner algorithm to generate a signal to send, receive and be given simultaneously.)
- 2020-07-01 17:00:02下载
- 积分：1
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montcarlo
Z transformation montcarlo module
- 2014-09-19 16:59:33下载
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mlclass-ex6
Support Vector Machines solution
- 2013-12-25 08:37:11下载
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WAVELET_WORK
THIS MATLAB CODE REDUCE THE SPECKLE NOISE IN SAR IMAGE, IT USE WAVELET FILTER THEN USED CASCADE THREE FILTERS IN TIME DOMAIN
(HYBRID TIME AND FREQUENCY DOMAIN).
THIS CODE NEED SOME MODIFICATIONS SINCE THERE ARE SOME PROBLEMS LIKE BY COMPUTE PSNR AND THE WAVELET HAS SOME ERRORS IN COMPUTE THE DE-NOISING
- 2010-09-10 14:45:57下载
- 积分：1
