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It employs narrowband 2.4\u00a0GHz IEEE\u00a0802.15.4 radio transceivers to acquire the radio channel\u2019s phase response. In comparison, most other systems employ time-of-flight schemes with Ultra Wideband transceivers. Our software can be used with existing wireless sensor network hardware, providing ranging and localization for existing devices at no extra cost. The introduced Complex-valued Distance Estimation algorithm evaluates the phase response to compute the distance between two radio devices. We achieve high ranging accuracy and precision with a mean absolute error of 0.149\u00a0m and a standard deviation of 0.104\u00a0m. We show that our algorithm is resilient against noise and burst errors from the phase-data acquisition. Further, we present a localization algorithm based on a particle filter implementation. It achieves a mean absolute error of 0.95\u00a0m in a realistic 3D live tracking scenario.<\/jats:p>","DOI":"10.1145\/3494542","type":"journal-article","created":{"date-parts":[[2022,1,13]],"date-time":"2022-01-13T14:28:49Z","timestamp":1642084129000},"page":"1-39","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["InPhase: Phase-based Ranging and Localization"],"prefix":"10.1145","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3205-9034","authenticated-orcid":false,"given":"Yannic","family":"Schr\u00f6der","sequence":"first","affiliation":[{"name":"Technische Universit\u00e4t Braunschweig, Institute of Operating Systems and Computer Networks, Braunschweig, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9782-7765","authenticated-orcid":false,"given":"Lars","family":"Wolf","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Braunschweig, Institute of Operating Systems and Computer Networks, Braunschweig, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2022,1,13]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1049\/iet-rsn.2017.0285"},{"key":"e_1_3_2_3_2","article-title":"Indoor positioning system for high dynamic applications","author":"Ansell Andrew","year":"2018","unstructured":"Andrew Ansell and Immanuel Ashokaraj. 2018. 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