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DVHop
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.)
- 2020-09-20 21:57:53下载
- 积分：1
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新建文件夹
说明： 谐振电路产生方波后输入脉冲信号到51单片机测量脉冲信号频率输出到1602显示屏上(The resonant circuit generates square wave and then inputs pulse signal to 51 single chip computer to measure pulse signal frequency and outputs it to 1602 display screen.r)
- 2020-06-17 23:20:01下载
- 积分：1
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App
说明： 诛仙邮件源码，可实现发送物品功能，等等保护类型：[0=无][1=装备后绑定][2=已绑定][3=下线后消失](The source code of Qixian mail can realize the function of sending goods, and other protection types: [0 = none] [1 = bind after equipment] [2 = bind] [3 = disappear after offline])
- 2019-05-13 23:39:34下载
- 积分：1
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VISSIM520_COM_中文
说明： VISSIM——com接口 vb、c++、java的使用手册(VISSIM-Manual for the Use of vb, c++, Java in com Interface)
- 2020-06-25 02:20:02下载
- 积分：1
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faikie
利用最小二乘法进行拟合多元非线性方程，采用了小波去噪的思想，小波包分析提取振动信号中的特征频率。( Multivariate least squares fitting method of nonlinear equations, Using wavelet denoising thought, Wavelet packet analysis to extract vibration signal characteristic frequency.)
- 2017-03-01 22:14:50下载
- 积分：1
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2D Unsteady convection-diffusion
说明： 2D Unsteady convection-diffusion problem
- 2020-06-22 01:20:02下载
- 积分：1
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dekkd_modkekfdakk
make design mode win form by c sharp
- 2019-02-02 15:04:12下载
- 积分：1
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1000yweb
适合游戏千年的网站，采用asp语言，windows下使用iis即可(A website for 1000y. Asp. Install iis on windows)
- 2017-12-27 14:53:03下载
- 积分：1
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skryj
实现4×4的数组元素的无冲突的存储,该算法不使用结构体,而直接使用了数组元素与下标之间的关系实现,比较巧妙,16×16可参()
- 2018-05-27 18:05:35下载
- 积分：1
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小游戏1
说明： 有c语言编写的推箱子小游戏，非常简单 新手可以看看(There are C language programming push box games, very simple novice can see)
- 2020-07-05 12:21:14下载
- 积分：1
