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Software-defined radios (SDRs) have been around for more than a decade. The first complete Global Positioning System (GPS) implementation was described by Dennis Akos in 1997. Since then several research groups have presented their contributions.We therefore find it timely to publish an up-to-date text on the subject and at the same time include Galileo, the forthcoming European satellitebased navigation system. Both GPS and Galileo belong to the category of Global Navigation Satellite Systems (GNSS).

说明：  用MC方法来求pi 正方形与圆形的面积比 最简单的方法(MC method with the easiest way to find pi)

说明：  跳频信号的产生，以函数方法编程，使用时直接传进参数即可。(Frequency hopping signals so as to function programming, the use of mass directly into the parameter.)

PCA程序，用于信号的主分量分析，用过几次，感觉不错(PCA program, the main component for signal analysis, used a few times, I feel good)

数学实验，聚类分析---用matlab做聚类分析，整个聚类实验的详细步骤，适用于学习算法的初学者(The mathematical experiment: cluster analysis--- do a cluster analysis using matlab)

石墨烯因其出色的电学、力学、热学、光学特性引起了全球研究热潮。作为超材料和变换光学平台，我们有必要计算它的电导率。(Because of Graphene s excellent electrical, mechanical, thermal and optical properties,it caused the global research boom. As the platform of metamaterials and transformation optics , we need to calculate its conductivity.)

该程序是MATLAB源程序，可以用来求纹理图像的方向。(MATLAB source code of the procedure can be used to seek the direction of texture images.)

使用面积法辨识一个二阶系统，辨识结果准确，速度快。(Area method)

vrptw没有时间窗。蚁群算法。有注释。(vrptw without time control.)

一个关于FSK的matlab编写的小程序，欢迎大家指正讨论(FSK s matlab on the preparation of small procedures, welcome to correct me to discuss)