FootStep-Tracker:An Anchor-Free Indoor Localization System via Sensing Foot Steps Chang Liu Jie Wu Abstract State Key Laboratory for Novel Department of Computer Recently,indoor localization has been a key supporting Software Technology Information and Sciences technology for most ubiquitous applications.However,most Nanjing University,P.R.China Temple University,USA localization schemes require the deployment of the anchor liuchang@dislab.nju.edu.cn jiewu@temple.edu nodes in advance to assist indoor localization.In this demo. we develop FootStep-Tracker,an indoor localization system Lei Xie Sanglu Lu via sensing the user's footsteps,without any support infras- State Key Laboratory for Novel State Key Laboratory for Novel tructures.By embedding tiny Sensor-Tag into the user's Software Technology Software Technology shoes,FootStep-Tracker is able to accurately perceive the Nanjing University,P.R.China Nanjing University,P.R.China user's moving trace,including the moving direction and dis- Ixie@nju.edu.cn sanglu@nju.edu.cn tance.Moreover,by detecting the user's activities such as going upstairs/downstairs and taking an elevator,FootStep- Chuyu Wang Tracker can correlate with the specified positions such as State Key Laboratory for Novel stairs and elevators,and determine the exacted moving Software Technology traces in the indoor map. Nanjing University,P.R.China wangcyu217@126.com Author Keywords Indoor Localization;User Activity Sensing;Sensing Foot Steps. Permission to make digital or hard coples of part or all of this work for personal or classroom use is granted without tee provided that copies are not made or distributed ACM Classification Keywords for profit or commercial advantage and that coples bear this notice and the full citation on the tirst page.Copyrights for components of this work owned by others than ACM H.5.m [Information interfaces and presentation (e.g.,HCI)]: must be honored.Abstracting with credit is permitted.To copy otherwise,to republish Miscellaneous to post on servers,or to redistribute to lists,requires prior specific permission and/or a fee.Request permissions from permissionsacm.org or Publications Dept,ACM, lnc,fax+1(212)869-0481. Introduction UbiComp'15 Adjunct,September 710,2015,Osaka.Japan. ACM978-1-4503-3575-1/15/D9. Nowadays,indoor localization schemes have been widely hmtp1k.dol.0rg10.1145/2800835.2B00844 used to support various applications.The state art indoorFootStep-Tracker: An Anchor-Free Indoor Localization System via Sensing Foot Steps Chang Liu State Key Laboratory for Novel Software Technology Nanjing University, P.R. China liuchang@dislab.nju.edu.cn Jie Wu Department of Computer Information and Sciences Temple University, USA jiewu@temple.edu Lei Xie State Key Laboratory for Novel Software Technology Nanjing University, P.R. China lxie@nju.edu.cn Sanglu Lu State Key Laboratory for Novel Software Technology Nanjing University, P.R. China sanglu@nju.edu.cn Chuyu Wang State Key Laboratory for Novel Software Technology Nanjing University, P.R. China wangcyu217@126.com Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from permissions@acm.org or Publications Dept., ACM, Inc., fax +1 (212) 869-0481. UbiComp ’15 Adjunct, September 710, 2015, Osaka, Japan. ACM 978-1-4503-3575-1/15/09. http://dx.doi.org/10.1145/2800835.2800844 Abstract Recently, indoor localization has been a key supporting technology for most ubiquitous applications. However, most localization schemes require the deployment of the anchor nodes in advance to assist indoor localization. In this demo, we develop FootStep-Tracker, an indoor localization system via sensing the user’s footsteps, without any support infras￾tructures. By embedding tiny Sensor-Tag into the user’s shoes, FootStep-Tracker is able to accurately perceive the user’s moving trace, including the moving direction and dis￾tance. Moreover, by detecting the user’s activities such as going upstairs/downstairs and taking an elevator, FootStep￾Tracker can correlate with the specified positions such as stairs and elevators, and determine the exacted moving traces in the indoor map. Author Keywords Indoor Localization;User Activity Sensing;Sensing Foot Steps. ACM Classification Keywords H.5.m [Information interfaces and presentation (e.g., HCI)]: Miscellaneous Introduction Nowadays, indoor localization schemes have been widely used to support various applications. The state art indoor