{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:UWDPTECWM4RRRBV7F6J77VERAD","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":"42b633cacf9579fcbadb54de353811a064619575a8da6d7dca073aa9c14e2685","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-04-01T12:27:28Z","title_canon_sha256":"bbc4017a0e54e29ba7645795e805e9de43200c9a12d166c8b18ac00dc5e83418"},"schema_version":"1.0","source":{"id":"1604.00219","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.00219","created_at":"2026-05-18T00:15:02Z"},{"alias_kind":"arxiv_version","alias_value":"1604.00219v2","created_at":"2026-05-18T00:15:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.00219","created_at":"2026-05-18T00:15:02Z"},{"alias_kind":"pith_short_12","alias_value":"UWDPTECWM4RR","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"UWDPTECWM4RRRBV7","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"UWDPTECW","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:34573c8781a0b54d0ac7f9a3c7c5be7e60ea3345b1f845bdfc31d87cf4634481","target":"graph","created_at":"2026-05-18T00:15:02Z","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 propose a novel method for estimating an elliptic shape approximation of a moving extended object that gives rise to multiple scattered measurements per frame. For this purpose, we parameterize the elliptic shape with its orientation and the lengths of the semi-axes. We relate an individual measurement with the ellipse parameters by means of a multiplicative noise model and derive a second-order extended Kalman filter for a closed-form recursive measurement update. The benefits of the new method are discussed by means of Monte Carlo simulations for both static and dynamic sce","authors_text":"Marcus Baum, Shishan Yang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-04-01T12:27:28Z","title":"Second-Order Extended Kalman Filter for Extended Object and Group Tracking"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.00219","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:e031b7857a113cb4ebb4f5c8d00b9ba2e3ba3d0c590c9425f143af85503f19ea","target":"record","created_at":"2026-05-18T00:15:02Z","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":"42b633cacf9579fcbadb54de353811a064619575a8da6d7dca073aa9c14e2685","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2016-04-01T12:27:28Z","title_canon_sha256":"bbc4017a0e54e29ba7645795e805e9de43200c9a12d166c8b18ac00dc5e83418"},"schema_version":"1.0","source":{"id":"1604.00219","kind":"arxiv","version":2}},"canonical_sha256":"a586f9905667231886bf2f93ffd49100e7fd870b0fb57601140abb6436712575","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a586f9905667231886bf2f93ffd49100e7fd870b0fb57601140abb6436712575","first_computed_at":"2026-05-18T00:15:02.488999Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:02.488999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jdiAqU9f2uQppbtQzDuYrsfhigGosM40bIvcaSPot8RyTfMsQSk0DeyCn7rp6yx5NpmfPGJy9YyjvBhyB0+vCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:02.489636Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.00219","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e031b7857a113cb4ebb4f5c8d00b9ba2e3ba3d0c590c9425f143af85503f19ea","sha256:34573c8781a0b54d0ac7f9a3c7c5be7e60ea3345b1f845bdfc31d87cf4634481"],"state_sha256":"5c34c21e3310f6bd46808551abf011e35e6d026551c57e2946d23225363860d8"}