{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:LK4EKN7VF64RRZGOJP2QPYMTGG","short_pith_number":"pith:LK4EKN7V","schema_version":"1.0","canonical_sha256":"5ab84537f52fb918e4ce4bf507e19331a66f5383a3accbb2f22f65abbdb1419d","source":{"kind":"arxiv","id":"1306.1651","version":1},"attestation_state":"computed","paper":{"title":"Accurate Indoor Localization Using Acoustic Direction Finding via Smart Phones","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.NI","authors_text":"Hao Lin, Panlong Yang, Wenchao Huang, Xiang-Yang Li, Xufei Mao, Yan Xiong, Yunhao Liu","submitted_at":"2013-06-07T08:30:38Z","abstract_excerpt":"We propose and implement a novel indoor localization scheme, Swadloon, built upon an accurate acoustic direction finding. Swadloon leverages sensors of the smartphone without the requirement of any specialized devices. The scheme Swadloon does not rely on any fingerprints and is very easy to use: a user only needs to shake the phone for a short duration before walking and localization. Our Swadloon design exploits a key observation: the relative shift and velocity of the phone-shaking movement corresponds to the subtle phase and frequency shift of the Doppler effects experienced in the receive"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1306.1651","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.NI","submitted_at":"2013-06-07T08:30:38Z","cross_cats_sorted":[],"title_canon_sha256":"040343d6b8128acafb4c3eb6eab8bf21bb64f0aacb7a749e101f51152eaf7dfd","abstract_canon_sha256":"c73318449a8387c5501f4a0ca144f35a264c49e4de485b1db5459b9e30624055"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:21:32.814855Z","signature_b64":"96Ny4cKrgiBeSr5xzas7BrWhikWQESg8rMsXCcPV2hlXTpz8jK/Lq6OxYGmBDrVVWwlEvp7wun4M7+lXUXNsAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5ab84537f52fb918e4ce4bf507e19331a66f5383a3accbb2f22f65abbdb1419d","last_reissued_at":"2026-05-18T03:21:32.814101Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:21:32.814101Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Accurate Indoor Localization Using Acoustic Direction Finding via Smart Phones","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.NI","authors_text":"Hao Lin, Panlong Yang, Wenchao Huang, Xiang-Yang Li, Xufei Mao, Yan Xiong, Yunhao Liu","submitted_at":"2013-06-07T08:30:38Z","abstract_excerpt":"We propose and implement a novel indoor localization scheme, Swadloon, built upon an accurate acoustic direction finding. Swadloon leverages sensors of the smartphone without the requirement of any specialized devices. The scheme Swadloon does not rely on any fingerprints and is very easy to use: a user only needs to shake the phone for a short duration before walking and localization. Our Swadloon design exploits a key observation: the relative shift and velocity of the phone-shaking movement corresponds to the subtle phase and frequency shift of the Doppler effects experienced in the receive"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.1651","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1306.1651","created_at":"2026-05-18T03:21:32.814226+00:00"},{"alias_kind":"arxiv_version","alias_value":"1306.1651v1","created_at":"2026-05-18T03:21:32.814226+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.1651","created_at":"2026-05-18T03:21:32.814226+00:00"},{"alias_kind":"pith_short_12","alias_value":"LK4EKN7VF64R","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_16","alias_value":"LK4EKN7VF64RRZGO","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_8","alias_value":"LK4EKN7V","created_at":"2026-05-18T12:27:51.066281+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG","json":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG.json","graph_json":"https://pith.science/api/pith-number/LK4EKN7VF64RRZGOJP2QPYMTGG/graph.json","events_json":"https://pith.science/api/pith-number/LK4EKN7VF64RRZGOJP2QPYMTGG/events.json","paper":"https://pith.science/paper/LK4EKN7V"},"agent_actions":{"view_html":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG","download_json":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG.json","view_paper":"https://pith.science/paper/LK4EKN7V","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1306.1651&json=true","fetch_graph":"https://pith.science/api/pith-number/LK4EKN7VF64RRZGOJP2QPYMTGG/graph.json","fetch_events":"https://pith.science/api/pith-number/LK4EKN7VF64RRZGOJP2QPYMTGG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG/action/storage_attestation","attest_author":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG/action/author_attestation","sign_citation":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG/action/citation_signature","submit_replication":"https://pith.science/pith/LK4EKN7VF64RRZGOJP2QPYMTGG/action/replication_record"}},"created_at":"2026-05-18T03:21:32.814226+00:00","updated_at":"2026-05-18T03:21:32.814226+00:00"}