{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:FAIENW7VCRZKLJTBRBSPO65MRG","short_pith_number":"pith:FAIENW7V","canonical_record":{"source":{"id":"1203.4430","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-03-20T13:33:01Z","cross_cats_sorted":[],"title_canon_sha256":"728c3838c362f233ded102af8be37b3c34033d313ea7176762f55ccb503faa87","abstract_canon_sha256":"226aff1f3f6341184b9d8b6b893a7104f6a91b690c5a63b83d2592d72884a6ba"},"schema_version":"1.0"},"canonical_sha256":"281046dbf51472a5a6618864f77bac89aee42146d97062e686c4963d8ef6270f","source":{"kind":"arxiv","id":"1203.4430","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4430","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4430v1","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4430","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"FAIENW7VCRZK","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"FAIENW7VCRZKLJTB","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"FAIENW7V","created_at":"2026-05-18T12:27:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:FAIENW7VCRZKLJTBRBSPO65MRG","target":"record","payload":{"canonical_record":{"source":{"id":"1203.4430","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-03-20T13:33:01Z","cross_cats_sorted":[],"title_canon_sha256":"728c3838c362f233ded102af8be37b3c34033d313ea7176762f55ccb503faa87","abstract_canon_sha256":"226aff1f3f6341184b9d8b6b893a7104f6a91b690c5a63b83d2592d72884a6ba"},"schema_version":"1.0"},"canonical_sha256":"281046dbf51472a5a6618864f77bac89aee42146d97062e686c4963d8ef6270f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:05.543577Z","signature_b64":"/yIAoMa8N3hVVZU+En1+7VVhCdoUACbNxrIp23LE/3qefnBRw+TW2ifVHHDdPT6HgGCzGD0wkZMsRr2ltw3YBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"281046dbf51472a5a6618864f77bac89aee42146d97062e686c4963d8ef6270f","last_reissued_at":"2026-05-18T01:58:05.543086Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:05.543086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.4430","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":"2026-05-18T01:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+S0ixrbVkAglHhNGsgCwSXWyw/ePD/MqroVZetOUPP4qJWKhbjM7WmZSTSgOxpd50RLRwZ2ZZpygxaRN8dyLCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T15:22:18.802804Z"},"content_sha256":"03b535a2f9623f6b817ffd17b5470f80fa562d6abadaf6bb7921241ce964e918","schema_version":"1.0","event_id":"sha256:03b535a2f9623f6b817ffd17b5470f80fa562d6abadaf6bb7921241ce964e918"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:FAIENW7VCRZKLJTBRBSPO65MRG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Kalman-filter control schemes for fringe tracking. Development and application to VLTI/GRAVITY","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"E. Choquet, G. Perrin, J. Menu, S. Lacour","submitted_at":"2012-03-20T13:33:01Z","abstract_excerpt":"The implementation of fringe tracking for optical interferometers is inevitable when optimal exploitation of the instrumental capacities is desired. Fringe tracking allows continuous fringe observation, considerably increasing the sensitivity of the interferometric system. In addition to the correction of atmospheric path-length differences, a decent control algorithm should correct for disturbances introduced by instrumental vibrations, and deal with other errors propagating in the optical trains. We attempt to construct control schemes based on Kalman filters. Kalman filtering is an optimal "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4430","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":"2026-05-18T01:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rvDagkuC8PBMeHR/zDaOch0qmd7SpLUBk60daLCOqBReGd8ko3TNdOvzfwgCXix6oQIQSh4CppSpmgxLk2xsDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T15:22:18.803154Z"},"content_sha256":"d3d6c56b0b32e2c8d43a8d53eeb348dd193606f86e4fa22cd6e5566283fc5e2a","schema_version":"1.0","event_id":"sha256:d3d6c56b0b32e2c8d43a8d53eeb348dd193606f86e4fa22cd6e5566283fc5e2a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FAIENW7VCRZKLJTBRBSPO65MRG/bundle.json","state_url":"https://pith.science/pith/FAIENW7VCRZKLJTBRBSPO65MRG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FAIENW7VCRZKLJTBRBSPO65MRG/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":"2026-06-09T15:22:18Z","links":{"resolver":"https://pith.science/pith/FAIENW7VCRZKLJTBRBSPO65MRG","bundle":"https://pith.science/pith/FAIENW7VCRZKLJTBRBSPO65MRG/bundle.json","state":"https://pith.science/pith/FAIENW7VCRZKLJTBRBSPO65MRG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FAIENW7VCRZKLJTBRBSPO65MRG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:FAIENW7VCRZKLJTBRBSPO65MRG","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":"226aff1f3f6341184b9d8b6b893a7104f6a91b690c5a63b83d2592d72884a6ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-03-20T13:33:01Z","title_canon_sha256":"728c3838c362f233ded102af8be37b3c34033d313ea7176762f55ccb503faa87"},"schema_version":"1.0","source":{"id":"1203.4430","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4430","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4430v1","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4430","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"FAIENW7VCRZK","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"FAIENW7VCRZKLJTB","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"FAIENW7V","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:d3d6c56b0b32e2c8d43a8d53eeb348dd193606f86e4fa22cd6e5566283fc5e2a","target":"graph","created_at":"2026-05-18T01:58:05Z","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":"The implementation of fringe tracking for optical interferometers is inevitable when optimal exploitation of the instrumental capacities is desired. Fringe tracking allows continuous fringe observation, considerably increasing the sensitivity of the interferometric system. In addition to the correction of atmospheric path-length differences, a decent control algorithm should correct for disturbances introduced by instrumental vibrations, and deal with other errors propagating in the optical trains. We attempt to construct control schemes based on Kalman filters. Kalman filtering is an optimal ","authors_text":"E. Choquet, G. Perrin, J. Menu, S. Lacour","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-03-20T13:33:01Z","title":"Kalman-filter control schemes for fringe tracking. Development and application to VLTI/GRAVITY"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4430","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":"sha256:03b535a2f9623f6b817ffd17b5470f80fa562d6abadaf6bb7921241ce964e918","target":"record","created_at":"2026-05-18T01:58:05Z","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":"226aff1f3f6341184b9d8b6b893a7104f6a91b690c5a63b83d2592d72884a6ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-03-20T13:33:01Z","title_canon_sha256":"728c3838c362f233ded102af8be37b3c34033d313ea7176762f55ccb503faa87"},"schema_version":"1.0","source":{"id":"1203.4430","kind":"arxiv","version":1}},"canonical_sha256":"281046dbf51472a5a6618864f77bac89aee42146d97062e686c4963d8ef6270f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"281046dbf51472a5a6618864f77bac89aee42146d97062e686c4963d8ef6270f","first_computed_at":"2026-05-18T01:58:05.543086Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:05.543086Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/yIAoMa8N3hVVZU+En1+7VVhCdoUACbNxrIp23LE/3qefnBRw+TW2ifVHHDdPT6HgGCzGD0wkZMsRr2ltw3YBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:05.543577Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.4430","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:03b535a2f9623f6b817ffd17b5470f80fa562d6abadaf6bb7921241ce964e918","sha256:d3d6c56b0b32e2c8d43a8d53eeb348dd193606f86e4fa22cd6e5566283fc5e2a"],"state_sha256":"d67f0b8e53d0b17f0a02197d2f5066de7d9f79d1e1a39b29576d4473a362bbbd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GsCxhd0jXG/zMGi3KFGdErOvckJG6l361roRy6jcMVrcO8LrZIY2DnYC52RCAM0uN/tipJvSmUaWp9ForHvoCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T15:22:18.805139Z","bundle_sha256":"ffe24f177d2dec8796608e8f7236d74f3a97659272c3cbbbcceaf343958859a4"}}