{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:HWOMKMRBUQ2L3MMAKOTO5CSOBR","short_pith_number":"pith:HWOMKMRB","schema_version":"1.0","canonical_sha256":"3d9cc53221a434bdb18053a6ee8a4e0c52c663b98e6b43b8f7644900b0778fba","source":{"kind":"arxiv","id":"1303.4397","version":1},"attestation_state":"computed","paper":{"title":"The Digital Motion Control System for the Submillimeter Array Antennas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"(2) Harvard-Smithsonian Center for Astrophysics, (3) Submillimeter Array, A. R. Diven (3), Cambridge, Charlottesville, Hilo, J. Maute (3), K. H. Young (2) ((1) National Radio Astronomy Observatory, N. A. Patel (2), P. Riddle (2), P. S. Leiker (2), R. Blundell (2), R. D. Christensen (3), R. J. Plante (2), R. Kimberk (2), R. W. Wilson (2), T. R. Hunter (1), USA, USA)","submitted_at":"2013-03-18T20:00:12Z","abstract_excerpt":"We describe the design and performance of the digital servo and motion control system for the 6-meter diameter parabolic antennas of the Submillimeter Array (SMA) on Mauna Kea, Hawaii. The system is divided into three nested layers operating at a different, appropriate bandwidth. (1) A rack-mounted, real-time Unix system runs the position loop which reads the high resolution azimuth and elevation encoders and sends velocity and acceleration commands at 100 Hz to a custom-designed servo control board (SCB). (2) The microcontroller-based SCB reads the motor axis tachometers and implements the ve"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1303.4397","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-03-18T20:00:12Z","cross_cats_sorted":[],"title_canon_sha256":"cd3434dd7cfd6d2aa37532972b96b7de1ac5c279947bcb8ef2f95e51c040d9b6","abstract_canon_sha256":"7dcf60dcf78cc293c4e7736f900c72049aa8938b4a9daf55970b07503ed1a55b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:20:12.862036Z","signature_b64":"zB/y9FGZlYKiOMwi7q2wjPvWAf4PtTYdkKARIwmgpG4PyYVWt6eIU1vlLLkUJazbvosMh14slXglCcArYQXdDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d9cc53221a434bdb18053a6ee8a4e0c52c663b98e6b43b8f7644900b0778fba","last_reissued_at":"2026-05-18T02:20:12.861610Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:20:12.861610Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Digital Motion Control System for the Submillimeter Array Antennas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"(2) Harvard-Smithsonian Center for Astrophysics, (3) Submillimeter Array, A. R. Diven (3), Cambridge, Charlottesville, Hilo, J. Maute (3), K. H. Young (2) ((1) National Radio Astronomy Observatory, N. A. Patel (2), P. Riddle (2), P. S. Leiker (2), R. Blundell (2), R. D. Christensen (3), R. J. Plante (2), R. Kimberk (2), R. W. Wilson (2), T. R. Hunter (1), USA, USA)","submitted_at":"2013-03-18T20:00:12Z","abstract_excerpt":"We describe the design and performance of the digital servo and motion control system for the 6-meter diameter parabolic antennas of the Submillimeter Array (SMA) on Mauna Kea, Hawaii. The system is divided into three nested layers operating at a different, appropriate bandwidth. (1) A rack-mounted, real-time Unix system runs the position loop which reads the high resolution azimuth and elevation encoders and sends velocity and acceleration commands at 100 Hz to a custom-designed servo control board (SCB). (2) The microcontroller-based SCB reads the motor axis tachometers and implements the ve"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.4397","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1303.4397","created_at":"2026-05-18T02:20:12.861665+00:00"},{"alias_kind":"arxiv_version","alias_value":"1303.4397v1","created_at":"2026-05-18T02:20:12.861665+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.4397","created_at":"2026-05-18T02:20:12.861665+00:00"},{"alias_kind":"pith_short_12","alias_value":"HWOMKMRBUQ2L","created_at":"2026-05-18T12:27:46.883200+00:00"},{"alias_kind":"pith_short_16","alias_value":"HWOMKMRBUQ2L3MMA","created_at":"2026-05-18T12:27:46.883200+00:00"},{"alias_kind":"pith_short_8","alias_value":"HWOMKMRB","created_at":"2026-05-18T12:27:46.883200+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR","json":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR.json","graph_json":"https://pith.science/api/pith-number/HWOMKMRBUQ2L3MMAKOTO5CSOBR/graph.json","events_json":"https://pith.science/api/pith-number/HWOMKMRBUQ2L3MMAKOTO5CSOBR/events.json","paper":"https://pith.science/paper/HWOMKMRB"},"agent_actions":{"view_html":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR","download_json":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR.json","view_paper":"https://pith.science/paper/HWOMKMRB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1303.4397&json=true","fetch_graph":"https://pith.science/api/pith-number/HWOMKMRBUQ2L3MMAKOTO5CSOBR/graph.json","fetch_events":"https://pith.science/api/pith-number/HWOMKMRBUQ2L3MMAKOTO5CSOBR/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR/action/storage_attestation","attest_author":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR/action/author_attestation","sign_citation":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR/action/citation_signature","submit_replication":"https://pith.science/pith/HWOMKMRBUQ2L3MMAKOTO5CSOBR/action/replication_record"}},"created_at":"2026-05-18T02:20:12.861665+00:00","updated_at":"2026-05-18T02:20:12.861665+00:00"}