An improved DV-Hop localization algorithm based on RSSI auxiliary ranging

Aiming at the problem of poor positioning accuracy of the traditional distance vector-hop (DV-Hop) localization algorithm which achieves positioning according to the network topology relations and the anchor nodes' locations, an improved twice-refinement DV-Hop localization algorithm based on received signal strength indicator (RSSI) auxiliary ranging and unknown node error correction using its own centroid is proposed in this paper. The improved algorithm uses RSSI ranging technology to get the distance between adjacent nodes for auxiliary positioning, and also uses the centroid coordinates of the unknown nodes to correct their own initial positioning results, then re-positions the unknown nodes by using the corrected coordinates. Simulation results show that, in the same experimental environment, compared with the traditional DV-Hop algorithm and several current improved DV-Hop algorithms, without additional hardware expenditures, the improved DV-Hop algorithm of this paper only needs the nodes with RSSI indicator function and adds a little computation and communication overhead, greatly reduces the node localization error and improves the localization accuracy.