Location:
Search - spectral width
Search list
Description: 一种自适应chirplet分解的快速算法
针对信号自适应chirplet分解未知参数多、实现起来比较困难的特点，文献[1]提出了一种新的chirplet分解快速算法。该算法利用计算信号的二次相位函数，得到其能量分布集中于信号的调频率曲线上的结论，此时通过谱峰检测可同时获得chirplet调频率、时间中心和幅度的估计；然后通过解线性调频技术获得其初始频率和宽度的估计，仿真结果验证了本文算法的有效性。
-Chirplet an adaptive decomposition algorithm for rapid adaptive signal decomposition Chirplet many unknown parameters, is more difficult to achieve the characteristics of the literature [1] proposed a new fast algorithm Chirplet decomposition. The algorithm calculating the signal function of the second phase, its energy distribution to be concentrated in the signal modulation frequency curve on the conclusions, this time through the spectral peak detection can be obtained simultaneously Chirplet tune the frequency, timing and magnitude of the estimated center then through the solution line technology of FM frequency and the width of the initial estimates, the simulation results verify the effectiveness of the algorithm.
Platform: |
Size: 80896 |
Author: nanzhewan |
Hits:
Description: 气象多普勒雷达——敏视达公司雷达谱宽处理程序。-Radar spectral width
Platform: |
Size: 778240 |
Author: fuzhikang |
Hits:
Description: 寻找光谱曲线的波峰波谷的波长位置及反射率值，计算其深度宽度等-Spectral curve of the peaks and valleys to find the wavelength position and reflectance values, calculate the width of its depth
Platform: |
Size: 1024 |
Author: 深海鑫蓝 |
Hits:
Description: Bandwidth (signal processing) or analog bandwidth, frequency bandwidth or radio bandwidth: a measure of the width of a range of frequencies, measured in hertz
Bandwidth (computing) or digital bandwidth: a rate of data transfer, bit rate or throughput, measured in bits per second (bps)
Spectral linewidth: the width of an atomic or molecular spectral line, measured in hertz
Platform: |
Size: 1024 |
Author: KIM JUNG HYUN |
Hits:
Description: 现代信号处理 一个序列为 ，使用FFT分析其频谱：
1） 使用不同宽度的矩形窗截短该序列为M点长度，取M分别为： a) M=20 b) M=40 c)M=160 ；观察不同长度的窗对谱分析结果的影响；
2）使用汉宁窗、哈明窗重做1）
3）对三种窗的结果进行理论分析及比较。并绘出相应的幅频特性曲线
-Modern signal processing a sequence, using FFT analysis of the spectrum: 1) the width of the rectangular windows with different truncated point of the sequence length of M, take M, respectively: a) M = 20 b) M = 40 c) M = 160 observation windows of different lengths affect the results of spectral analysis 2) Hanning window, Hamming window redo 1) 3) the results of three windows and compare the theoretical analysis. And draw the corresponding amplitude-frequency characteristic curve
Platform: |
Size: 3072 |
Author: 李时雨 |
Hits:
Description: 天气雷达IQ数据 PPP处理方法，反射率，速度，谱宽-Weather Radar IQ data PPP treatment method, reflectivity, velocity and spectral width
Platform: |
Size: 7168 |
Author: 景号然 |
Hits:
Description: 读取和显示新一代天气雷达基数据，包括强度、速度、谱宽。-Read and display the new generation of weather radar base data, including strength, speed, spectral width.
Platform: |
Size: 709632 |
Author: gaozhang |
Hits:
Description: 实际光源不是绝对的单色，包含一定的光谱宽度△λ。△λ范围内的每一种波长的光都生成各自一组干涉条纹，除零干涉级外，相互间均有位移，使条纹对比度下降。-The actual light source is not absolutely monochromatic, contain a certain spectral width △ λ. Each wavelength of light within the range △ λ generates a set of interference fringes each, in addition to the zero level outside interference, mutual displacement are so fringe contrast decreases.
Platform: |
Size: 1024 |
Author: xiebiwei |
Hits:
Description: matlab模拟两束平面波干涉
（1）光源非单色性的影响
实际光源不是绝对的单色，包含一定的光谱宽度△λ。△λ范围内的每一种波长的光都生成各自一组干涉条纹，除零干涉级外，相互间均有位移，使条纹对比度下降。
能产生干涉条纹的最大光程差称为相干长度。与光源的光谱宽度成反比。光源的光谱宽度越小，就能在更大的光程差下观察到干涉条纹。
（2）两相干光波振幅比的影响
振幅相差越大，对比度越小。若两相干光波的振幅相差很大，两相干光波造成的强度实际上与其中较大强度的一个光波单独产生的强度没有多大区别，这时干涉场几乎为一片均匀照度，看不出干涉条纹。
-matlab simulation of plane wave two-beam interference (1) the impact of non-monochromatic light source is not absolute actual color, it contains a certain spectral width △ λ. Each of the light wavelength in the range of △ λ generates a respective set of interference fringes, in addition to the zero level outside interference, are mutually displaced so that fringe contrast decreases. It can produce interference fringes maximum optical path difference is called the coherence length. And inversely proportional to the spectral width of the light source. The smaller the spectral width of the light source, the greater can be observed under the optical path difference of interference fringes. (2) Effect of coherent light wave amplitude ratio of the two amplitudes greater the difference, the lower the contrast. If the amplitude of the two coherent lightwave vary widely, due to the strength of two coherent light intensity which is actually a large light intensity alone does not produce much dif
Platform: |
Size: 1024 |
Author: lililili |
Hits:
Description: 高光谱遥感与传统的单波段、多光谱数据相比，波段量大量增加、波段宽度极大降低，对地面目标的光谱特性的测度更加细致，然而波段的增多必然导致数据量急剧增加、计算量增大、信息冗余增加以及统计参数的估计偏差增大。因此，对高光谱数据进行降维处理具有重要意义。一方面，降维能够使图像远离噪声，提高图像数据质量；另一方面，能够去除图像中的无价值波段，减少波段数，从而降低计算量，提高运算效率。主成分分析是常用的高光谱数据降维处理方法之一。(Compared with the single band, hyperspectral remote sensing and traditional multi spectral data, a substantial increase in the amount of band width of band, greatly reduced, measure spectral characteristics of ground objects in greater detail, but the increase will inevitably lead to a sharp increase in band data and increase the amount of calculation, and increase the information redundancy of statistical parameter estimation error. So it has important significance to reduce the dimensionality of hyperspectral data. On the one hand, the dimension reduction can make the image far away from noise and improve the quality of image data; on the other hand, it can remove the non value bands in the image, reduce the number of bands, thereby reducing the amount of calculation and improving the efficiency of the calculation. Principal component analysis is used for dimensionality reduction of hyperspectral data processing methods.)
Platform: |
Size: 1895424 |
Author: 太过安静
|
Hits: