{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:BKJARCIITZ5EOJ5V4M26UIA6M2","short_pith_number":"pith:BKJARCII","canonical_record":{"source":{"id":"1402.6222","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-25T16:07:00Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"d3582e7732c8e31bcfb23f467a642b999c9c2f7a5bac02f29fdf8d7d608cbf2a","abstract_canon_sha256":"38df6ee895456d315b806c727efe511c4474ae53b48336409983e84bcbebff7f"},"schema_version":"1.0"},"canonical_sha256":"0a920889089e7a4727b5e335ea201e66a6b3c2117e9b47b6bb1322a4225811d6","source":{"kind":"arxiv","id":"1402.6222","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.6222","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"arxiv_version","alias_value":"1402.6222v2","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.6222","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"pith_short_12","alias_value":"BKJARCIITZ5E","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BKJARCIITZ5EOJ5V","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BKJARCII","created_at":"2026-05-18T12:28:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:BKJARCIITZ5EOJ5V4M26UIA6M2","target":"record","payload":{"canonical_record":{"source":{"id":"1402.6222","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-25T16:07:00Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"d3582e7732c8e31bcfb23f467a642b999c9c2f7a5bac02f29fdf8d7d608cbf2a","abstract_canon_sha256":"38df6ee895456d315b806c727efe511c4474ae53b48336409983e84bcbebff7f"},"schema_version":"1.0"},"canonical_sha256":"0a920889089e7a4727b5e335ea201e66a6b3c2117e9b47b6bb1322a4225811d6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:42:46.424736Z","signature_b64":"8V0AVFGNx1ViHUDTopl9IqBFnpHEwWzr97ndxmY3ugJew5CGvBKjBpabwQ6a6x6dPeKmje6vZBUpGN5BgISFBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0a920889089e7a4727b5e335ea201e66a6b3c2117e9b47b6bb1322a4225811d6","last_reissued_at":"2026-05-18T02:42:46.424191Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:42:46.424191Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1402.6222","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:42:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qyPLPHNI45QXGHONXllD/CXOBeSZbuiP64oYN1OTTGZQPNTZ+c5AAHIoNo3H7yfwuES1/L1INzsmMTOyiDIRDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:34:57.234825Z"},"content_sha256":"aed912362ede688589980c0ef9f38fcd547fa332d279d78f7841b9f0137182dd","schema_version":"1.0","event_id":"sha256:aed912362ede688589980c0ef9f38fcd547fa332d279d78f7841b9f0137182dd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:BKJARCIITZ5EOJ5V4M26UIA6M2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First stage of LISA data processing: Clock synchronization and arm-length determination via a hybrid-extended Kalman filter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"gr-qc","authors_text":"Gerhard Heinzel, Karsten Danzmann, Yan Wang","submitted_at":"2014-02-25T16:07:00Z","abstract_excerpt":"In this paper, we describe a hybrid-extended Kalman filter algorithm to synchronize the clocks and to precisely determine the inter-spacecraft distances for space-based gravitational wave detectors, such as (e)LISA. According to the simulation, the algorithm has significantly improved the ranging accuracy and synchronized the clocks, making the phase-meter raw measurements qualified for time- delay interferometry algorithms."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.6222","kind":"arxiv","version":2},"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":"2026-05-18T02:42:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M5zXKsk9fKTP40lP+yIO80fIZo93RAHljyTNc1RQ2LbrHVD3YlK3dPdGQ9OqCilUzQY05DNN59SBquleHk9ZCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T07:34:57.235173Z"},"content_sha256":"ffbbf62118c85e13b536ba815bf2884d5f2688154b31f3ed1695c523dc2864ac","schema_version":"1.0","event_id":"sha256:ffbbf62118c85e13b536ba815bf2884d5f2688154b31f3ed1695c523dc2864ac"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/bundle.json","state_url":"https://pith.science/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/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":"2026-06-01T07:34:57Z","links":{"resolver":"https://pith.science/pith/BKJARCIITZ5EOJ5V4M26UIA6M2","bundle":"https://pith.science/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/bundle.json","state":"https://pith.science/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BKJARCIITZ5EOJ5V4M26UIA6M2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:BKJARCIITZ5EOJ5V4M26UIA6M2","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":"38df6ee895456d315b806c727efe511c4474ae53b48336409983e84bcbebff7f","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-25T16:07:00Z","title_canon_sha256":"d3582e7732c8e31bcfb23f467a642b999c9c2f7a5bac02f29fdf8d7d608cbf2a"},"schema_version":"1.0","source":{"id":"1402.6222","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1402.6222","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"arxiv_version","alias_value":"1402.6222v2","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1402.6222","created_at":"2026-05-18T02:42:46Z"},{"alias_kind":"pith_short_12","alias_value":"BKJARCIITZ5E","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"BKJARCIITZ5EOJ5V","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"BKJARCII","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:ffbbf62118c85e13b536ba815bf2884d5f2688154b31f3ed1695c523dc2864ac","target":"graph","created_at":"2026-05-18T02:42:46Z","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, we describe a hybrid-extended Kalman filter algorithm to synchronize the clocks and to precisely determine the inter-spacecraft distances for space-based gravitational wave detectors, such as (e)LISA. According to the simulation, the algorithm has significantly improved the ranging accuracy and synchronized the clocks, making the phase-meter raw measurements qualified for time- delay interferometry algorithms.","authors_text":"Gerhard Heinzel, Karsten Danzmann, Yan Wang","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-25T16:07:00Z","title":"First stage of LISA data processing: Clock synchronization and arm-length determination via a hybrid-extended Kalman filter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1402.6222","kind":"arxiv","version":2},"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:aed912362ede688589980c0ef9f38fcd547fa332d279d78f7841b9f0137182dd","target":"record","created_at":"2026-05-18T02:42:46Z","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":"38df6ee895456d315b806c727efe511c4474ae53b48336409983e84bcbebff7f","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-02-25T16:07:00Z","title_canon_sha256":"d3582e7732c8e31bcfb23f467a642b999c9c2f7a5bac02f29fdf8d7d608cbf2a"},"schema_version":"1.0","source":{"id":"1402.6222","kind":"arxiv","version":2}},"canonical_sha256":"0a920889089e7a4727b5e335ea201e66a6b3c2117e9b47b6bb1322a4225811d6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0a920889089e7a4727b5e335ea201e66a6b3c2117e9b47b6bb1322a4225811d6","first_computed_at":"2026-05-18T02:42:46.424191Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:42:46.424191Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8V0AVFGNx1ViHUDTopl9IqBFnpHEwWzr97ndxmY3ugJew5CGvBKjBpabwQ6a6x6dPeKmje6vZBUpGN5BgISFBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:42:46.424736Z","signed_message":"canonical_sha256_bytes"},"source_id":"1402.6222","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aed912362ede688589980c0ef9f38fcd547fa332d279d78f7841b9f0137182dd","sha256:ffbbf62118c85e13b536ba815bf2884d5f2688154b31f3ed1695c523dc2864ac"],"state_sha256":"e44a6979d1acf2ddebc0131bf84f27b2fa94672d217fd5e3449f0f18a101a0f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BHZh0xqVXkBVWWFmHhdujd8fy5KtakG6Kei5UYT02c3Nh21fNliZU05kTbBwFo7ICxkcCeqP8+zXMhPM2c/nCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T07:34:57.237166Z","bundle_sha256":"ce8a16df3817ba09a293f16c49e2dbc6e09c65aaf1be6b149c1183b8ee5693e6"}}