{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:I3DMGUKLK3IIJEFC6C7D6HPHQS","short_pith_number":"pith:I3DMGUKL","canonical_record":{"source":{"id":"1806.03409","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T04:25:04Z","cross_cats_sorted":[],"title_canon_sha256":"31d49fc1b82dfa124b90c236231fe792fe27a6c8ba8e0f6f0b074bb46d99aa7f","abstract_canon_sha256":"6b49fffed09036113f36c780d3ac303e3cadf5fac860aeac826caf3fb7163380"},"schema_version":"1.0"},"canonical_sha256":"46c6c3514b56d08490a2f0be3f1de784a1fa9ed3c6eb4cea6f208ad495ef53a9","source":{"kind":"arxiv","id":"1806.03409","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03409","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03409v2","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03409","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"pith_short_12","alias_value":"I3DMGUKLK3II","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"I3DMGUKLK3IIJEFC","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"I3DMGUKL","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:I3DMGUKLK3IIJEFC6C7D6HPHQS","target":"record","payload":{"canonical_record":{"source":{"id":"1806.03409","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T04:25:04Z","cross_cats_sorted":[],"title_canon_sha256":"31d49fc1b82dfa124b90c236231fe792fe27a6c8ba8e0f6f0b074bb46d99aa7f","abstract_canon_sha256":"6b49fffed09036113f36c780d3ac303e3cadf5fac860aeac826caf3fb7163380"},"schema_version":"1.0"},"canonical_sha256":"46c6c3514b56d08490a2f0be3f1de784a1fa9ed3c6eb4cea6f208ad495ef53a9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:52.763959Z","signature_b64":"PFQtt9Bg0wChZbawmljo7BiT0BLDtQReVBSrLZA40bsI6r+uljzfSzkYvISx+RvYWi4G4CUpaa+WHCl87vEEAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46c6c3514b56d08490a2f0be3f1de784a1fa9ed3c6eb4cea6f208ad495ef53a9","last_reissued_at":"2026-05-17T23:58:52.763426Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:52.763426Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.03409","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":"2026-05-17T23:58:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ug/9E3G/PY0pXYRrEZFf1TG9fT6IeR1WtXaWgBiBvwiZc5VBh4c2ETP3MY1ZNe71GbYIfIw4cd1q7//WwYNOBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T01:59:47.121292Z"},"content_sha256":"879823ea752c6f8767a70387491d6f4faf4c44e9ba212934bc419124c9d66d41","schema_version":"1.0","event_id":"sha256:879823ea752c6f8767a70387491d6f4faf4c44e9ba212934bc419124c9d66d41"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:I3DMGUKLK3IIJEFC6C7D6HPHQS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sparse Bayesian Learning-Based Direction Finding Method With Unknown Mutual Coupling Effect","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Linxi Liu, Peng Chen, Xuan Zhang, Zhimin Chen","submitted_at":"2018-06-09T04:25:04Z","abstract_excerpt":"The imperfect array degrades the direction finding performance. In this paper, we investigate the direction finding problem in uniform linear array (ULA) system with unknown mutual coupling effect between antennas. By exploiting the target sparsity in the spatial domain, sparse Bayesian learning (SBL)-based model is proposed and converts the direction finding problem into a sparse reconstruction problem. In the sparse-based model, the \\emph{off-grid} errors are introduced by discretizing the direction area into grids. Therefore, an off-grid SBL model with mutual coupling vector is proposed to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03409","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":"2026-05-17T23:58:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NcQyFHrbpVLpWM+V8triakNhsjqQ/CJ+LF+UMyE7r1ofbRvfhk8e9pkMV75DqkYjbU0RKxrFI6EpEwuMrratAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T01:59:47.121654Z"},"content_sha256":"788ac3410b0f11792645decf04baed11b83cb353ea81e20d24761742f531e6d1","schema_version":"1.0","event_id":"sha256:788ac3410b0f11792645decf04baed11b83cb353ea81e20d24761742f531e6d1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/bundle.json","state_url":"https://pith.science/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/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":"2026-06-07T01:59:47Z","links":{"resolver":"https://pith.science/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS","bundle":"https://pith.science/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/bundle.json","state":"https://pith.science/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I3DMGUKLK3IIJEFC6C7D6HPHQS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:I3DMGUKLK3IIJEFC6C7D6HPHQS","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":"6b49fffed09036113f36c780d3ac303e3cadf5fac860aeac826caf3fb7163380","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T04:25:04Z","title_canon_sha256":"31d49fc1b82dfa124b90c236231fe792fe27a6c8ba8e0f6f0b074bb46d99aa7f"},"schema_version":"1.0","source":{"id":"1806.03409","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.03409","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"arxiv_version","alias_value":"1806.03409v2","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.03409","created_at":"2026-05-17T23:58:52Z"},{"alias_kind":"pith_short_12","alias_value":"I3DMGUKLK3II","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"I3DMGUKLK3IIJEFC","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"I3DMGUKL","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:788ac3410b0f11792645decf04baed11b83cb353ea81e20d24761742f531e6d1","target":"graph","created_at":"2026-05-17T23:58:52Z","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"},"paper":{"abstract_excerpt":"The imperfect array degrades the direction finding performance. In this paper, we investigate the direction finding problem in uniform linear array (ULA) system with unknown mutual coupling effect between antennas. By exploiting the target sparsity in the spatial domain, sparse Bayesian learning (SBL)-based model is proposed and converts the direction finding problem into a sparse reconstruction problem. In the sparse-based model, the \\emph{off-grid} errors are introduced by discretizing the direction area into grids. Therefore, an off-grid SBL model with mutual coupling vector is proposed to ","authors_text":"Linxi Liu, Peng Chen, Xuan Zhang, Zhimin Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T04:25:04Z","title":"Sparse Bayesian Learning-Based Direction Finding Method With Unknown Mutual Coupling Effect"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.03409","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":"sha256:879823ea752c6f8767a70387491d6f4faf4c44e9ba212934bc419124c9d66d41","target":"record","created_at":"2026-05-17T23:58:52Z","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":"6b49fffed09036113f36c780d3ac303e3cadf5fac860aeac826caf3fb7163380","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2018-06-09T04:25:04Z","title_canon_sha256":"31d49fc1b82dfa124b90c236231fe792fe27a6c8ba8e0f6f0b074bb46d99aa7f"},"schema_version":"1.0","source":{"id":"1806.03409","kind":"arxiv","version":2}},"canonical_sha256":"46c6c3514b56d08490a2f0be3f1de784a1fa9ed3c6eb4cea6f208ad495ef53a9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46c6c3514b56d08490a2f0be3f1de784a1fa9ed3c6eb4cea6f208ad495ef53a9","first_computed_at":"2026-05-17T23:58:52.763426Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:52.763426Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PFQtt9Bg0wChZbawmljo7BiT0BLDtQReVBSrLZA40bsI6r+uljzfSzkYvISx+RvYWi4G4CUpaa+WHCl87vEEAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:52.763959Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.03409","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:879823ea752c6f8767a70387491d6f4faf4c44e9ba212934bc419124c9d66d41","sha256:788ac3410b0f11792645decf04baed11b83cb353ea81e20d24761742f531e6d1"],"state_sha256":"dc48e52ae6b9bdf16f7ff473cc0c06b6bb33e28c4ed68ec6030288ed283ba6e2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"azjJKchllBvzCf5lFSbOP1SOfbJkvevAUrlCVBQqBdmEctYs2rkptRmxM9VzDEWY6GCa0YHiNhrwv1fqEYf0BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T01:59:47.123663Z","bundle_sha256":"be28555539665d0499eaf70462f75677e7fe073e58c2070ad9d7e821dbbec357"}}