基于RFID的二维室内定位算法的实现

为了克服全球定位系统（GPS）对室内定位的盲点,在RFID一维定位的理论基础上推导出二维的室内定位算法,只需在室内摆放4个参考标签及两个远距RFID读取器即可实现二维定位,大大降低了系统的硬件成本。另外,基于RFID技术设计了一套嵌入式室内定位系统,通过该系统对二维定位方法进行实验验证,得到远距RFID读取器的不同二维坐标下的实验数据。为了减小RSSI值受电波的影响引起定位的不稳定,算法中通过增加读取参考标签RSSI值的次数的方法进行改善。通过对数据的分析可得,该算法可以实现准确及稳定的二维室内定位。

Implementation of Two-dimensional Indoor Location Algorithm Based on RFID

In order to overcome the indoor positioning blind spot of the global positioning system（GPS）,the two-dimensional indoor localization algorithm is derived based on one-dimensional theory.Only four references and two remote RFID tag readers are needed in the room for the implementation of 2-D positioning.The cost of system hardware is greatly reduced by the algorithm.In addition,a set of embedded indoor positioning system is designed based on RFID.The two-dimensional positioning method is verified by the system.The experimental data of long-distance RFID readers is obtained at different two-dimensional coordinates.To reduce the impact of electric wave on RSSI value not to cause the positioning instability,a method of increasing the times to read the reference label RSSI values is adopted to improve the algorithm.The analysis of the data available shows that the algorithm can achieve accurate and stable two-dimensional indoor localization.