The Design And Implementation Of Multiple Technology Fusion Indoor Localization

With the rapid development of mobile Internet and the prevalence of concepts like Online to Offline, location service is becoming more and more important. As to indoor environment positioning, it is still lack of a mature solution, which makes the indoor positioning research boom quickly. Currently, most of the indoor localization solutions based on mobile device use a single method for localization, such as WIFI localization and iBeacon localization. WIFI localization solution is widely used for its low-cost, high coverage features. However, in practical localization engineering, this solution still has some limitations, due to its reflection and multiple effects. Besides, as most smart phones have been equipped with a variety of build-in sensors, such as WIFI, Bluetooth, accelerometer, gyroscope, and so on, the smart phone-based multi-mode integration of indoor localization becomes possible. By adopting multiple technologies, the indoor localization solution can combine the advantages of several localization technologies, which helps to improve the accuracy and stability of positioning result.In this paper, a solution of multiple technology fusion indoor localization was proposed, in which WIFI RSSI fingerprinting, Bluetooth localization, and high-frequency audio localization were to be adopted for integration and collaboration, through the integration strategy and constraints strategy, and therefore provide a low-cost, high precision indoor positioning scheme. In this scheme, the phone scans the WIFI RSSI, Bluetooth 4.0 RSSI and audio information nearby, and calculates the indoor position by using the combinative strategy of WIFI fingerprint-based primarily and Bluetooth 4.0 and audio auxiliary. Meanwhile, this article specifically describes the implementation of the fusion localization system in Android mobile phone platforms, which has also been tested in the building of School of Software, Sun Yat-sen University. The testing results indicated that comparing with a single positioning method, the multiple technology fusion indoor localization gets a better performance, with remarkable lower location error.