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无线传感器网络中一种高效的距离差估计方法 被引量:2
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作者 王晨 殷勤业 王文杰 《中国科学:信息科学》 CSCD 2010年第4期637-645,共9页
RIPS系统通过测量干涉信号的相位提供了一种精度高、设备简单的无线传感器网络定位方法.但利用相位进行测距和定位的方法不可避免地存在相位模糊问题,RIPS系统采取的方式是在多个频率下对某一距离差进行相位测量,根据各相位测量值来搜... RIPS系统通过测量干涉信号的相位提供了一种精度高、设备简单的无线传感器网络定位方法.但利用相位进行测距和定位的方法不可避免地存在相位模糊问题,RIPS系统采取的方式是在多个频率下对某一距离差进行相位测量,根据各相位测量值来搜索实际距离差.为了避免RIPS系统中这种繁复的搜索过程,文中提出了一种高效的距离差估计方法.该方法基于中国余数定理(CRT)通过闭式一次直接计算得出距离估计值,从而避免了搜索过程,极大地降低了节点运算能耗并且提高了定位系统的实时性.同时,为了克服传统CRT算法对噪声敏感的缺点,利用算法中加权系数具有的一些性质来减小噪声对估计结果的影响,提高了算法的鲁棒性.仿真结果表明该方法鲁棒性好,估计精度高,在无线传感器网络中具有良好的可行性. 展开更多
关键词 距离差估计 相位模糊 中国余数定理 鲁棒性 无线传感器网络
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Institutional Distance and CrossNational Income Gaps
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作者 黄新飞 舒元 徐裕敏 《China Economist》 2014年第2期76-89,共14页
ihis paper examines the root causes of current cross-national institutional difference from the perspective of national hetereogeneity and provides detailed explanations on the justification and effectiveness of using... ihis paper examines the root causes of current cross-national institutional difference from the perspective of national hetereogeneity and provides detailed explanations on the justification and effectiveness of using cross-national genetic distance as the instrumental variable (IV) of institutional difference. We combined 10,585 samples by pairing 146 countries and regions, created a cross-national institutional distance variable composed of 14 indicators from the World Bank and the Heritage Foundation in three aspects including differences of political system, economic system and institutional implementation attributes, and conducted a cross-section IV estimation for the long-term effect of institutional differences on cross-national income gaps using data between 1996 and 2010. Empirical results indicate that institutional difference has a long-term significant positive effect on cross-national income gaps and such an effect has a tendency to increase during sample period. With factors like human capital, geographical factor, language and religion under control, we still arrived at similar conclusions. The empirical results are demonstrated to be robust using different genetic distance measurement indicators and estimation methods. 展开更多
关键词 institutional distance cross-national income gap genetic distance nationalheterogeneity estimation of instrumental variable
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