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无线传感器网络波束合成的影响因素研究 被引量:1

A study of the influencing factors of wireless sensor network beamforming
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摘要 将无线传感器网络WSN(wireless sensor networks)与天线阵波束合成技术相结合,可用以实现WSN的远距离无线通信.与以往节点选用各向同性天线时的情况不同,本文中节点选用定向天线.针对由此引入的天线轴角度偏移问题,具体分析了WSN中常见的节点失效和位置误差对合成波束方向图所带来的影响;通过对节点的辐射功率调整,在保持合成方向图主瓣特性的基础上,有效地降低了旁瓣电平;为增大网络的覆盖面积,可以在一定范围内对节点间距进行扩展,经研究发现,节点间距的扩展范围与所选用天线的波瓣特性有相对固定的约束关系. Wireless sensor networks(WSN) technology was combined with antenna array beamforming to realize WSN's long range communication.Instead of using isotropic antennas as reported in the literatures,all nodes in this paper were equipped with directional antennas for beamforming.The influence of sensor node failure and position error on the combined beam pattern was analyzed considering the antenna beam inclination.The node's radiation power adjustment was studied to reduce the side lobe level effectively as the main lobe remained almost unchanged.To increase the networks' coverage area,node distance can be extended within a certain range which is constrained by the antenna beam pattern.
作者 尤览 刘发林
出处 《中国科学技术大学学报》 CAS CSCD 北大核心 2010年第4期406-411,共6页 JUSTC
关键词 定向天线 波束合成 天线轴偏移 节点失效 位置误差 辐射功率调整 节点间距扩展 directional antenna beamforming antenna beam inclination node failure position error radiation power adjustment node distance extension
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