In order to meet the indoor positioning demand for multi-floor building

a barometer and Wi Fi-based fusion positioning method is proposed. On the basis of Wi Fi floor positioning system

by crowdsourcing sensing technology to collect data pressure of each floor to construct barometer floor localization module

and use barometer floor localization to fill Wi Fi signal coverage blind area and monitor Wi Fi floor localization error

dynamicly update of Wi Fi fingerprint database. The experimental results show that the barometer floor positioning module can ensure accuracy above 90 %

this technique can not only improve the universality of the positioning

and maintain the Wi Fi floor localization accuracy around 80 %

reduce system maintenance costs.