一种基于正交定向天线的节点定位算法

摘要

为了解决定向天线定位方法的定位范围较小的问题,提出了一种基于正交定向天线的室内无线定位方法.将一个带有4个定向天线且相邻之间相互垂直的节点作为锚节点,并将被测范围分成4个象限;利用未知节点信号强度确定所在象限;根据目标节点所获得的对应象限两垂直天线信号强度值确定信号强差;根据距离不变时方位角与信号强差近似满足线性关系和子集筛选方法以及最大密度方法,确定最终的匹配集合,最后通过曼哈顿匹配出未知节点的实际位置.实验结果表明,该方法在保证定位速度的情况下,将定位范围扩大了3倍左右,定位误差降至0.7886 m.%To solve the problem of small location range of the directional antenna,an indoor wireless location method based on orthogonal directional antenna is proposed.A node with four directional antennas that are perpendicular each other is used as an anchor node.The measured range is divided into four quadrants,the signal strength of the unknown node is utilized to determine the location quadrant,the two vertical antenna signals strength of the target node of corresponding quadrant is used to obtain the RSSI difference.According to the approximate linear function of azimuth and signal strength difference at the same distance,the subset selection method and the largest density method,the final matching set is determined,and the actual position of the unknown nodes is matched by Manhattan.Experimental results show that in the case of ensuring the positioning speed,the method can expand the range by about three times,the positioning error is reduced to 0.7886 m.