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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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Form1.Desier
说明： asp and c# library using, shopping card project
- 2020-06-24 08:40:01下载
- 积分：1
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FreeRTOS中文实用教程.pdf
FreeRTOS中文实用教程.pdf
- 2020-05-06下载
- 积分：1
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link
连连看 小游戏 可以进行几本的连连看，玩得比较爽，看上去比较舒服(the little games，it is very good)
- 2013-09-28 22:55:09下载
- 积分：1
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Michell_wigley_grid
划分船舶。用来划分区域做与偶先元分析的东西，可以好好使用(Divide ships. What is used for zoning and dual-priori analysis can be used well.)
- 2020-06-16 10:40:01下载
- 积分：1
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电子文档，基于互信息的图像配准，配准的文献为局部互信息，还有香农信息论文献...
电子文档，基于互信息的图像配准，配准的文献为局部互信息，还有香农信息论文献-Electronic documents, based on mutual information image registration, registration of documents for the partial mutual information, as well as the Shannon information theory literature
- 2023-06-24 17:35:03下载
- 积分：1
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RADAR
说明： 这是有关搜索雷达的程序，并有相关的绘图代码。(This is a search radar program, and has the relevant drawing code.)
- 2020-11-02 15:59:53下载
- 积分：1
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关于鸟的心，时钟的一些有趣的节目，等等，别人做的，就…
一些有趣的程序，有鸟，表，心等，是别人做的，在这用下而已！-some interesting programs about bird ,heart ,colock,and so on,made by others,just for use here!
- 2022-07-09 19:56:45下载
- 积分：1
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光子晶体光纤 超连续谱
光子晶体光纤
超连续谱
考虑色散、非线性效应、自陡峭、拉曼效应。(Photonic crystal fibers
Supercontinuum spectrum
Dispersion, nonlinearity, self-steepening and Raman effects are considered.)
- 2020-07-13 00:29:00下载
- 积分：1
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Setting
phan mem vao cai dat set ting
- 2017-09-07 18:56:31下载
- 积分：1
