zhucongduoji_method123

Scale Invariant Feature transform ( SIFT)-- this code implements the SIFT algorithm which extracts features invariant to Scale, Rotation and translation from any image.

this file is the code of fuzzy numbers

基于Simulink的平坦瑞丽衰落的信道建模与性能分析(Based on channel modeling and performance analysis of Simulink flat fading)

this file is for matlab filters

详细介绍了隐马尔科夫链的原理和matlab代码实现，可以运行其中的demo了解hmm的工作原理(Detailed information on hidden Markov chain theory and the matlab code, you can run the demo to understand the working principle hmm)

计算卫星位置的fortran程序，用切比雪夫内插任意时刻的三位坐标,精度课达mm级别。内有数据课进行对比验证，内容讲解的不是很详细请原谅。(Calculation of satellite position fortran program Chebyshev interpolation at any time of the three coordinates, accuracy up to mm-level classes. There are data comparing class verification, the content does not explain in great detail please forgive me.)

置换熵，一种度量信号混乱程度的非线性指标，permutation entropy(Permutation entropy, a nonlinear signal indicators measure of disorder, permutation entropy)

SIFT特征匹配算法是目前国内外特征点匹配研究领域的热点与难点，其匹配能力较强，可以处理两幅图像之间发生的平移、旋转情况下的匹配问题(SIFT features matching algorithm is the hot matching algorithm of feature points at home and abroad . its matching ability is strong.It can match the feature points of two images which are rotated or traslation.)

为了提高通信系统的信息传输速率，人们提出了UWB通信系统，即Ultra-Wideband 通信系统。在UWB系统中，信号的带宽一般都在GHz的量级，这么宽的带宽造成了UWB系统和现有的通信系统频谱的重叠。为了降低对现有通信系统的影响，UWB信号的设计需要满足一定的频谱模板。如果一个信号的频谱基本满足频谱模板的规定（即在绝大部分频段内功率小于规定区间的上限），我们可以认定其为一个UWB信号。(In order to improve communication systems, information transmission rate of UWB communications systems have been proposed, namely, Ultra-Wideband communication systems. In the UWB system, the signal bandwidth will generally be in the order of GHz, caused such a wide bandwidth of UWB system and the existing communications system spectrum overlap. In order to reduce the impact of the existing communication systems, UWB signal design needs to meet certain spectral mask. If a signal spectrum can basically meet the spectral mask (that is, in most of the provisions of band power is less than the maximum range), we can assume it as a UWB signal.)

说明：  matlab中文帮助，非常有用哦！！！！(matlab Chinese help, very useful oh! ! ! !)