{"id":"https://openalex.org/W4405305790","doi":"https://doi.org/10.1109/ipin62893.2024.10786184","title":"Precise near-ultrasonic tilt determination for smartphones","display_name":"Precise near-ultrasonic tilt determination for smartphones","publication_year":2024,"publication_date":"2024-10-14","ids":{"openalex":"https://openalex.org/W4405305790","doi":"https://doi.org/10.1109/ipin62893.2024.10786184"},"language":"en","primary_location":{"id":"doi:10.1109/ipin62893.2024.10786184","is_oa":false,"landing_page_url":"https://doi.org/10.1109/ipin62893.2024.10786184","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2024 14th International Conference on Indoor Positioning and Indoor Navigation (IPIN)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5025283836","display_name":"Jan Grottke","orcid":"https://orcid.org/0000-0002-1165-9594"},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Jan Grottke","raw_affiliation_strings":["RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany"],"affiliations":[{"raw_affiliation_string":"RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany","institution_ids":["https://openalex.org/I887968799"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5115408277","display_name":"Daniel Grottke","orcid":null},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Daniel Grottke","raw_affiliation_strings":["RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany"],"affiliations":[{"raw_affiliation_string":"RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany","institution_ids":["https://openalex.org/I887968799"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5000085993","display_name":"J\u00f6rg Blankenbach","orcid":"https://orcid.org/0000-0002-5700-8818"},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"J\u00f6rg Blankenbach","raw_affiliation_strings":["RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany"],"affiliations":[{"raw_affiliation_string":"RWTH Aachen University,Geodetic Institute and Chair for Computing in Civil Engineering &#x0026; Geo Information Systems,Aachen,Germany","institution_ids":["https://openalex.org/I887968799"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5025283836"],"corresponding_institution_ids":["https://openalex.org/I887968799"],"apc_list":null,"apc_paid":null,"fwci":0.739,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.72112944,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":91,"max":99},"biblio":{"volume":null,"issue":null,"first_page":"1","last_page":"7"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10860","display_name":"Speech and Audio Processing","score":0.9775000214576721,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10860","display_name":"Speech and Audio Processing","score":0.9775000214576721,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12222","display_name":"IoT-based Smart Home Systems","score":0.9581000208854675,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12697","display_name":"Water Quality Monitoring Technologies","score":0.9495000243186951,"subfield":{"id":"https://openalex.org/subfields/2312","display_name":"Water Science and Technology"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/ultrasonic-sensor","display_name":"Ultrasonic sensor","score":0.7387916445732117},{"id":"https://openalex.org/keywords/tilt","display_name":"Tilt (camera)","score":0.6982951164245605},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5745360255241394},{"id":"https://openalex.org/keywords/ultrasonic-imaging","display_name":"Ultrasonic imaging","score":0.501699686050415},{"id":"https://openalex.org/keywords/acoustics","display_name":"Acoustics","score":0.43582671880722046},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.36314475536346436},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.16150185465812683},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.15301090478897095},{"id":"https://openalex.org/keywords/mechanical-engineering","display_name":"Mechanical engineering","score":0.07913655042648315}],"concepts":[{"id":"https://openalex.org/C81288441","wikidata":"https://www.wikidata.org/wiki/Q20736125","display_name":"Ultrasonic sensor","level":2,"score":0.7387916445732117},{"id":"https://openalex.org/C2779844322","wikidata":"https://www.wikidata.org/wiki/Q2919140","display_name":"Tilt (camera)","level":2,"score":0.6982951164245605},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5745360255241394},{"id":"https://openalex.org/C2989478337","wikidata":"https://www.wikidata.org/wiki/Q234904","display_name":"Ultrasonic imaging","level":3,"score":0.501699686050415},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.43582671880722046},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.36314475536346436},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.16150185465812683},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.15301090478897095},{"id":"https://openalex.org/C78519656","wikidata":"https://www.wikidata.org/wiki/Q101333","display_name":"Mechanical engineering","level":1,"score":0.07913655042648315}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/ipin62893.2024.10786184","is_oa":false,"landing_page_url":"https://doi.org/10.1109/ipin62893.2024.10786184","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2024 14th International Conference on Indoor Positioning and Indoor Navigation (IPIN)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/7","display_name":"Affordable and clean energy","score":0.5799999833106995}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":33,"referenced_works":["https://openalex.org/W2037034232","https://openalex.org/W2057727186","https://openalex.org/W2083256639","https://openalex.org/W2106226434","https://openalex.org/W2108482152","https://openalex.org/W2111165378","https://openalex.org/W2112737587","https://openalex.org/W2113188254","https://openalex.org/W2160146756","https://openalex.org/W2171785275","https://openalex.org/W2401995242","https://openalex.org/W2520216431","https://openalex.org/W2614122591","https://openalex.org/W2770420323","https://openalex.org/W2945587613","https://openalex.org/W3011794741","https://openalex.org/W3046585190","https://openalex.org/W3084340299","https://openalex.org/W3131461523","https://openalex.org/W3135436230","https://openalex.org/W3205114100","https://openalex.org/W4200256930","https://openalex.org/W4200261490","https://openalex.org/W4210786856","https://openalex.org/W4223951182","https://openalex.org/W4297474229","https://openalex.org/W4312529157","https://openalex.org/W4363672396","https://openalex.org/W4389388888","https://openalex.org/W4391547383","https://openalex.org/W6625135867","https://openalex.org/W6634040119","https://openalex.org/W6734074513"],"related_works":["https://openalex.org/W2380594826","https://openalex.org/W2031629218","https://openalex.org/W4238525810","https://openalex.org/W4247875078","https://openalex.org/W4238161731","https://openalex.org/W2117714849","https://openalex.org/W4256618856","https://openalex.org/W2377597505","https://openalex.org/W2366714167","https://openalex.org/W1976507804"],"abstract_inverted_index":{"Modern":[0],"smartphones":[1],"incorporate":[2],"numerous":[3],"sensors":[4],"that":[5,37],"enable":[6],"relative":[7,141,159],"positioning":[8],"utilizing":[9],"the":[10,14,26,38,50,53,57,75,78,82,87,103,112,115,120,123,126,139,143,161,179],"measurement":[11,17],"data":[12],"from":[13,25],"internal":[15],"inertial":[16],"unit.":[18],"Their":[19],"motion":[20],"can":[21],"thus":[22],"be":[23,42,164],"derived":[24],"magnetometer,":[27],"gyroscope,":[28],"and":[29,46,81,122,176],"acceleration":[30,39,83],"sensor":[31],"data.":[32],"The":[33,145,156],"problem,":[34],"however,":[35],"is":[36,59,65],"signals":[40,84],"cannot":[41],"separated":[43],"into":[44],"vertical":[45],"horizontal":[47],"directions":[48],"during":[49],"movement.":[51],"Therefore,":[52,94],"absolute":[54],"tilt":[55,146],"of":[56,77,119,138,170,174],"smartphone":[58,121,140],"often":[60],"unknown.":[61],"Nevertheless,":[62],"this":[63],"separation":[64],"required":[66],"for":[67,90,133,178],"many":[68],"step-based":[69],"distance":[70,97],"determination":[71,98,137],"methods":[72],"to":[73,110,142,160],"estimate":[74],"length":[76],"detected":[79],"steps":[80],"measured":[85],"between":[86,114],"step":[88],"events":[89],"each":[91],"directional":[92],"component.":[93],"a":[95,134,151,167],"near-ultrasound-based":[96],"was":[99,148],"realized,":[100],"which":[101],"applies":[102],"Frequency-Modulated":[104],"Continuous-Wave":[105],"Radar":[106],"method":[107],"(FMCW":[108],"Radar)":[109],"determine":[111],"difference":[113],"onboard":[116],"microphone\u2019s":[117],"position":[118,154],"ground":[124,162],"(or":[125],"nearest":[127],"reflective":[128],"surface).":[129],"These":[130],"distances":[131],"allow":[132],"precise":[135],"inclination":[136],"ground.":[144],"estimation":[147],"compared":[149],"with":[150,166],"camera-based":[152],"reference":[153],"determination.":[155],"smartphone\u2019s":[157],"angle":[158],"could":[163],"determined":[165],"median":[168],"accuracy":[169,173],"2.73\u00b0,":[171],"mean":[172],"3.37\u00b0,":[175],"4.56\u00b0":[177],"third":[180],"quartile":[181],"error.":[182]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2025,"cited_by_count":1}],"updated_date":"2026-03-06T13:50:29.536080","created_date":"2025-10-10T00:00:00"}
