Firstly, the multi-communication radius is used to communicate with the anchor node step by step, and the distance between the anchor node and the node to be measured is calculated by RSSI's own ranging model. To solve this problem, On the basis of the existing RSSI localization algorithms, this paper proposes a RSSI three-dimensional localization algorithm based on multiple communication radius and distance corrections (MD-RSSI), which selects anchor nodes by five-step communication mechanism and distance correction factor corrects the estimated distance. At present, RSSI-based positioning algorithm is widely used because of its simplicity, but RSSI algorithm has high energy consumption and large ranging error when positioning nodes, which affects the service life of the network and the positioning accuracy of nodes. Three-dimensional ranging and positioning algorithms in wireless sensor networks mostly rely on the principle of two-dimensional positioning algorithm.
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