RSSI和距离区间映射的测距方法

Ranging Method Based on the Mapping Between RSSI and Distance Scope

无线传感器网络中传统的测距方法是建立接收信号能量(RSSI)和距离之间一对一的映射,没有很好地考虑RSSI随机变化较大的问题,测距误差较大。该文提出了建立RSSI和距离区间之间一对多的映射关系的测距方法。在离线阶段,建立RSSI和距离区间之间的映射关系数据库;在线测量阶段,用测得的若干个RSSI值查询数据库,将得到的若干个距离区间进行加权求和得到一个新的距离区间,再取该区间的质心进行测距。仿真结果表明,该方法具有较高的测距精度。

Traditional ranging methods are to create an one-to-one mapping between received signal strength indicator （RSSI） and distance in wireless sensor networks. In this paper, a ranging method based on one-to-many mapping between RSSI and distance scope is proposed. At off-line stage, a database of the mapping between RSSI and distance scope is created; at on-line stage, by using RSSI values to query the database, some distance scopes are obtained and weighted to generate a new distance scope. At last, the distance between the transmitter and the receiver can be attained through the center of the distance scope. Simulation results show that the scheme provides high ranging precision.