{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7KNN4P6MNUAC6X52IHFCBAGFDH","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":"a7d544d89b7f2b10334dd993ba10b464dcc2971926cd6a1814c4cfb02e221f0b","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2018-05-08T20:46:39Z","title_canon_sha256":"3e399ba1fa6d9f5ea6952aa1fc19b4b6037c455fb3842d5c2d9d50bc90e6083d"},"schema_version":"1.0","source":{"id":"1805.03276","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.03276","created_at":"2026-06-04T19:11:52Z"},{"alias_kind":"arxiv_version","alias_value":"1805.03276v2","created_at":"2026-06-04T19:11:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.03276","created_at":"2026-06-04T19:11:52Z"},{"alias_kind":"pith_short_12","alias_value":"7KNN4P6MNUAC","created_at":"2026-06-04T19:11:52Z"},{"alias_kind":"pith_short_16","alias_value":"7KNN4P6MNUAC6X52","created_at":"2026-06-04T19:11:52Z"},{"alias_kind":"pith_short_8","alias_value":"7KNN4P6M","created_at":"2026-06-04T19:11:52Z"}],"graph_snapshots":[{"event_id":"sha256:2b6ba3efbd68eec714f0dea3b1426f5a25ed3c13d4e09a81d890f01b36877fdd","target":"graph","created_at":"2026-06-04T19:11:52Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1805.03276/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Extended object tracking considers the simultaneous estimation of the kinematic state and the shape parameters of a moving object based on a varying number of noisy detections. A main challenge in extended object tracking is the nonlinearity and high-dimensionality of the estimation problem. This work presents compact closed-form expressions for a recursive Kalman filter that explicitly estimates the orientation and axes lengths of an extended object based on detections that are scattered over the object surface (according to a Gaussian distribution). Existing approaches are either based on Mo","authors_text":"Marcus Baum, Shishan Yang","cross_cats":["cs.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2018-05-08T20:46:39Z","title":"Tracking the Orientation and Axes Lengths of an Elliptical Extended Object"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.03276","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:a15e480b7f31277191d551e8066b61b129bb1acf4d5983821f2a35a8ce5bbe6f","target":"record","created_at":"2026-06-04T19:11:52Z","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":"a7d544d89b7f2b10334dd993ba10b464dcc2971926cd6a1814c4cfb02e221f0b","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2018-05-08T20:46:39Z","title_canon_sha256":"3e399ba1fa6d9f5ea6952aa1fc19b4b6037c455fb3842d5c2d9d50bc90e6083d"},"schema_version":"1.0","source":{"id":"1805.03276","kind":"arxiv","version":2}},"canonical_sha256":"fa9ade3fcc6d002f5fba41ca2080c519f3e93ceac6435436f36480fb45e51fc4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fa9ade3fcc6d002f5fba41ca2080c519f3e93ceac6435436f36480fb45e51fc4","first_computed_at":"2026-06-04T19:11:52.537498Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-04T19:11:52.537498Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4LObXRZSitIDmphVWmajaD5tYNEim6Gwm3QjI45RtYr08l8002bCZ55iINtFHd5AV8Ex76PatK0wKlhldURACw==","signature_status":"signed_v1","signed_at":"2026-06-04T19:11:52.538041Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.03276","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a15e480b7f31277191d551e8066b61b129bb1acf4d5983821f2a35a8ce5bbe6f","sha256:2b6ba3efbd68eec714f0dea3b1426f5a25ed3c13d4e09a81d890f01b36877fdd"],"state_sha256":"cf880a00eaad2ec4c4fc68aa2ae44fccbe20fca077322c14fd82ad887bc61498"}