{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:AIUBHZ4DUW3WHLAV57WVN6OZ3R","short_pith_number":"pith:AIUBHZ4D","canonical_record":{"source":{"id":"1710.07052","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-10-19T09:31:09Z","cross_cats_sorted":[],"title_canon_sha256":"0bccefd234cf927f424f1faccd5be5aa0affe34aa7887f85e3f940da4039c455","abstract_canon_sha256":"0ac056a9da0262e450f98b34836826b82770bea69d6cbb322de099b70e12577b"},"schema_version":"1.0"},"canonical_sha256":"022813e783a5b763ac15efed56f9d9dc6ee84913e67b00c5932d6e536639040b","source":{"kind":"arxiv","id":"1710.07052","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.07052","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"arxiv_version","alias_value":"1710.07052v1","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.07052","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"pith_short_12","alias_value":"AIUBHZ4DUW3W","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"AIUBHZ4DUW3WHLAV","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"AIUBHZ4D","created_at":"2026-05-18T12:31:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:AIUBHZ4DUW3WHLAV57WVN6OZ3R","target":"record","payload":{"canonical_record":{"source":{"id":"1710.07052","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-10-19T09:31:09Z","cross_cats_sorted":[],"title_canon_sha256":"0bccefd234cf927f424f1faccd5be5aa0affe34aa7887f85e3f940da4039c455","abstract_canon_sha256":"0ac056a9da0262e450f98b34836826b82770bea69d6cbb322de099b70e12577b"},"schema_version":"1.0"},"canonical_sha256":"022813e783a5b763ac15efed56f9d9dc6ee84913e67b00c5932d6e536639040b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:32:27.193963Z","signature_b64":"iZtzwgOlppnXMsronjWyZleSiG2EQo3k2tWVbENQPuAfgSt32QH9o6lLuiVqo9NRaZFEddB7v5dYChFX4LHZBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"022813e783a5b763ac15efed56f9d9dc6ee84913e67b00c5932d6e536639040b","last_reissued_at":"2026-05-18T00:32:27.193362Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:32:27.193362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.07052","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:32:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dX6g+c5bDG+bzgFsDLUFI5qI6mUYY0BppNI+b+PeD1bcitVvF/MTT7xa2s8FNDDxdUwUPG8pC75FKNvKOnPECA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T14:24:31.585855Z"},"content_sha256":"0871de8990c3fb4d463ffb80e62a9f4ea66d7215e1b7e41148d4f0afbe8d7cb7","schema_version":"1.0","event_id":"sha256:0871de8990c3fb4d463ffb80e62a9f4ea66d7215e1b7e41148d4f0afbe8d7cb7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:AIUBHZ4DUW3WHLAV57WVN6OZ3R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"TDoA Based Positioning using Ultrasound Signals and Wireless Nodes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Alessio De Angelis, Antonella Comuniello, Antonio Moschitta","submitted_at":"2017-10-19T09:31:09Z","abstract_excerpt":"In this paper, a positioning technique based on Time Difference of Arrival (TDoA) measurements is analyzed. The proposed approach is designed to consent range and position estimation, using ultrasound transmissions of a stream of chirp pulses, received by a set of wireless nodes. A potential source of inaccuracy introduced by lack of synchronization between transmitting node and receiving nodes is identified and characterized. An algorithm to identify and correct such inaccuracies is presented."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.07052","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:32:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b+N/kT1tJkFqozf0gEFfL8qymibBnfG6OdmyiLW7aTNoG5Xuv0TZp4tLgw5Ffw0/B0qT7jeb7ChcODFSk9JfAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T14:24:31.586199Z"},"content_sha256":"5d798b0f5f89bd2fd2a040bcef530ed942b7a410908b8f914093b636c4d7c860","schema_version":"1.0","event_id":"sha256:5d798b0f5f89bd2fd2a040bcef530ed942b7a410908b8f914093b636c4d7c860"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/bundle.json","state_url":"https://pith.science/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-09T14:24:31Z","links":{"resolver":"https://pith.science/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R","bundle":"https://pith.science/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/bundle.json","state":"https://pith.science/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AIUBHZ4DUW3WHLAV57WVN6OZ3R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:AIUBHZ4DUW3WHLAV57WVN6OZ3R","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"0ac056a9da0262e450f98b34836826b82770bea69d6cbb322de099b70e12577b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-10-19T09:31:09Z","title_canon_sha256":"0bccefd234cf927f424f1faccd5be5aa0affe34aa7887f85e3f940da4039c455"},"schema_version":"1.0","source":{"id":"1710.07052","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.07052","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"arxiv_version","alias_value":"1710.07052v1","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.07052","created_at":"2026-05-18T00:32:27Z"},{"alias_kind":"pith_short_12","alias_value":"AIUBHZ4DUW3W","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"AIUBHZ4DUW3WHLAV","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"AIUBHZ4D","created_at":"2026-05-18T12:31:05Z"}],"graph_snapshots":[{"event_id":"sha256:5d798b0f5f89bd2fd2a040bcef530ed942b7a410908b8f914093b636c4d7c860","target":"graph","created_at":"2026-05-18T00:32:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this paper, a positioning technique based on Time Difference of Arrival (TDoA) measurements is analyzed. The proposed approach is designed to consent range and position estimation, using ultrasound transmissions of a stream of chirp pulses, received by a set of wireless nodes. A potential source of inaccuracy introduced by lack of synchronization between transmitting node and receiving nodes is identified and characterized. An algorithm to identify and correct such inaccuracies is presented.","authors_text":"Alessio De Angelis, Antonella Comuniello, Antonio Moschitta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-10-19T09:31:09Z","title":"TDoA Based Positioning using Ultrasound Signals and Wireless Nodes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.07052","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:0871de8990c3fb4d463ffb80e62a9f4ea66d7215e1b7e41148d4f0afbe8d7cb7","target":"record","created_at":"2026-05-18T00:32:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"0ac056a9da0262e450f98b34836826b82770bea69d6cbb322de099b70e12577b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2017-10-19T09:31:09Z","title_canon_sha256":"0bccefd234cf927f424f1faccd5be5aa0affe34aa7887f85e3f940da4039c455"},"schema_version":"1.0","source":{"id":"1710.07052","kind":"arxiv","version":1}},"canonical_sha256":"022813e783a5b763ac15efed56f9d9dc6ee84913e67b00c5932d6e536639040b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"022813e783a5b763ac15efed56f9d9dc6ee84913e67b00c5932d6e536639040b","first_computed_at":"2026-05-18T00:32:27.193362Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:32:27.193362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iZtzwgOlppnXMsronjWyZleSiG2EQo3k2tWVbENQPuAfgSt32QH9o6lLuiVqo9NRaZFEddB7v5dYChFX4LHZBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:32:27.193963Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.07052","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0871de8990c3fb4d463ffb80e62a9f4ea66d7215e1b7e41148d4f0afbe8d7cb7","sha256:5d798b0f5f89bd2fd2a040bcef530ed942b7a410908b8f914093b636c4d7c860"],"state_sha256":"a393a5967acbcd85b7cde2bfbce6fa4cdd86b8179234661df5213017ca98d5fd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LhmBV4gN/WWvdNuM8dORvcc3pb8BD8H/oDRZkX6xPRUODobjc+eZ241pSK48x/mhsVHo5aNgdFkT84+8fQWiCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T14:24:31.588148Z","bundle_sha256":"fda2cca15dcbc7030fad7c80b0f1ae7449fc2c1faab3c63248071b7c69aef706"}}