Bringing CUPID Indoor Positioning System to Practice

WiFi based indoor positioning has recently gained more at-tention due to the advent of the IEEE 802.11v standard, requirements by the FCC for E911 calls, and increased in-terest in location-based services. While there exist several indoor localization techniques, we find that these techniques tradeoff either accuracy, scalability, pervasiveness or cost – all of which are important requirements for a truly deploy-able positioning solution. Wireless signal-strength based ap-proaches suffer from location errors, whereas time-of-flight (ToF) based solutions provide good accuracy but are not scalable. Recent solutions address these issues by augment-ing WiFi with either smartphone sensing or mobile crowd-sourcing. However, they require tight coupling between WiFi infrastructure and a client device, or they can determine the client’s location only if it is mobile. In this paper, we present CUPID2.0 which improved our previously proposed CUPID indoor positioning system to overcome these limita-tions. We achieve this by addressing the fundamental limi-tations in Time-of-Flight based localization and combining ToF with signal strength to address scalability. Experiments from 6 cities using 40 different mobile devices, comprising of more than 2.5 million location fixes demonstrate feasibil-ity. CUPID2.0 is currently under production, and we expect CUPID2.0 to ignite the wide adoption of WLAN-based po-sitioning systems and their services