Ranging Method Based on the Mapping Between RSSI and Distance Scope

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.