20170529145310772

针对基于双曲线定位的DV-Hop算法中误差项的异方差性引起的定位误差大的问题，提出了一种基于加权双曲线定位的DV-Hop改进算法。算法分析了基于双曲线定位的DV-Hop算法模型中误差项的异方差性，用加权最小二乘法对异方差性进行纠正，对加权最小二乘法中的权值矩阵进行了推导并得到与跳数相关的最佳权值矩阵，使得误差项满足同方差性，所得估计值更加接近最佳线性无偏估计。仿真实验结果表明，所提算法在节点定位精度上较现有的基于双曲线定位的DV-Hop算法都有一定提高。(Aiming at the problem that the heteroscedasticity of observation errors leads to low locating accuracy in DV-Hop algorithm based on hyperbolic positioning, this paper proposes an improved DV-Hop algorithm which based on weighted hyperbolic positioning. The algorithm analysis the heteroscedasticity of the error term in the model and takes advantage of weighted least square method which corrects heteroscedasticity straightforwardly. Then, the weight matrix related to least hops between nodes is deduced, the estimators thus obtained are more close to the best linear unbiased estimator. The simulation results show that the location performance of the improved algorithm is better than that of the exsiting DV-Hop algorithm which based on hyperbolic positioning.)

说明：  C语言讲得最专业的一本图书，各种疑难都讲得很好，值得拥有(The most professional book in C language is worth having.)

用r计算SPEI，实现少量数据的快速计算，(Calculating SPEI with R to realize fast calculation of a small amount of data)

用于估计MSVAR模型，是利用OX软件进行估计(Estimation of MSVAR model)

说明：  本代码基于matlab上实现提取信号极值与信号包络(Extracting signal extremum and envelope)

这是我大一第二个学期期末制作的软件工程课程设计，逻辑上没有什么太复杂的， 当时学习的东西不是很多，用了链表，其中使用了DOS下汉字直显，无需汉字系统 支持，使用了文件操作，就当时对c语言的联系：）-This my second semester freshman year ending production of software engineering curriculum design, logic, nothing too complicated, not learning a lot of things, the use of linked lists, which use Chinese characters straight DOS significantly without Chinese support system, the use of paper operations, on the prevailing language of c contact :)

用count.v和count.c两个文件作为例子，用来说明modelsim的pLI使用方法-using two source files (count.v and count.c ) to demonstrate how to use modesim with PLI

运用logistic模型对人口进行预测分析(Prediction and Analysis of Population by Logistic Model)

连锁专卖店系统，powerbuilder，很不错的。可以参考使用，供学习使用-Chain store system, powerbuilder, very good. Can refer to the use for learning to use

采集温度源码 准确能用!! 可以下栽用用 -) 51单片机就可以实现,单线式采集-collecting accurate temperature source can be used. ! Can be used with downward-) 51 microcontroller can be achieved. single-Acquisition! !