Multi-floor indoor positioning method and system based on LoRa technology

The invention discloses a multi-floor indoor positioning method and system based on a LoRa technology, and relates to the technical field of positioning, a small number of LoRa-based positioning nodes are deployed in multiple floors, then a multi-floor fingerprint database based on LoRa signals is established, and filtering processing is performed through an LOF algorithm, so that the accuracy of the fingerprint database is improved. The method is divided into an offline stage and an online stage. In the off-line stage, a floor discrimination model and a plane positioning model are respectively established by using a weighted K nearest neighbor algorithm and a principal component regression algorithm. In the online stage, online fingerprint information is input into the floor judgment model to obtain floor information, and on the basis of predicting the floor information, the plane positioning model is used for further completing plane positioning of online fingerprints. The method has good floor identificati