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In our system called Daredevil, smartphones emit sound at particular times and frequencies, which are received by microphone arrays. Using SSL that we modified for our purposes, we can calculate the angle between the center of each microphone array and the phone, and thereby triangulate the phone's position. In this early work, we demonstrate the feasibility of our approach and present initial results. Daredevil can locate smartphones in a room with an average precision of 3.19 feet. We identify a number of challenges in realizing the system in large deployments, and we hope this work will benefit researchers who pursue such techniques.<\/jats:p>","DOI":"10.1145\/2636242.2636245","type":"journal-article","created":{"date-parts":[[2014,6,24]],"date-time":"2014-06-24T12:16:16Z","timestamp":1403612176000},"page":"9-19","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":11,"title":["Daredevil"],"prefix":"10.1145","volume":"18","author":[{"given":"Ionut","family":"Constandache","sequence":"first","affiliation":[{"name":"Duke University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sharad","family":"Agarwal","sequence":"additional","affiliation":[{"name":"Microsoft Research"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivan","family":"Tashev","sequence":"additional","affiliation":[{"name":"Microsoft Research"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Romit Roy","family":"Choudhury","sequence":"additional","affiliation":[{"name":"University of Illinois at Urbana-Champaign"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2014,6,3]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/INFCOM.2000.832252"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1067170.1067191"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/2307636.2307653"},{"key":"e_1_2_1_4_1","volume-title":"IEEE INFOCOM","author":"Constandache I.","year":"2010","unstructured":"I. 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Wang, and C.-C. Wang. Simultaneous localization of mobile robot and multiple sound sources using microphone array. In IEEE ICRA, 2009."},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1117\/12.280797"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1109\/TASSP.1976.1162830"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1145\/1137975.1137980"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-01721-6_14"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1145\/345910.345917"},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1109\/TAP.1986.1143830"},{"key":"e_1_2_1_15_1","article-title":"A statistical model based voice activity detector","author":"Sohn J.","year":"1999","unstructured":"J. Sohn , N. Kim , and W. Sung . A statistical model based voice activity detector . In IEEE Signal Processing Letters , Jan. 1999 . J. Sohn, N. Kim, and W. Sung. 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