{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:A3723MUBUDMNZUSGOE4RWQK6I4","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":"ad0502008e74238435492ba9c0644b99ed7d561720ab2cef64e6bf9f74380a82","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-04-11T05:09:47Z","title_canon_sha256":"731ed1bae5c517662d0c111cbf877a92a7268c82b112e003eb3763cee0203609"},"schema_version":"1.0","source":{"id":"1904.05534","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.05534","created_at":"2026-05-17T23:48:49Z"},{"alias_kind":"arxiv_version","alias_value":"1904.05534v1","created_at":"2026-05-17T23:48:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.05534","created_at":"2026-05-17T23:48:49Z"},{"alias_kind":"pith_short_12","alias_value":"A3723MUBUDMN","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"A3723MUBUDMNZUSG","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"A3723MUB","created_at":"2026-05-18T12:33:12Z"}],"graph_snapshots":[{"event_id":"sha256:7ee7d94a39d8794a6de9f0c6bf2158538d8f2ba47c8337b1a37342f157d959f9","target":"graph","created_at":"2026-05-17T23:48:49Z","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, direction-of-arrival estimation using nested array is studied in the framework of sparse signal representation. With the vectorization operator, a new real-valued nonnegative sparse signal recovery model which has a wider virtual array aperture is built. To leverage celebrated compressive sensing algorithms, the continuous parameter space has to be discretized to a number of fixed grid points, which inevitably incurs modeling error caused by off-grid gap. To remedy this issue, a block alternating optimization method is put forth that jointly estimates the sparse signal and refin","authors_text":"Chunlei Zhao, Xing-Peng Mao, Yong-Tan Liu, Yunmei Shi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-04-11T05:09:47Z","title":"A Block Alternating Optimization Method for Direction-of-Arrival Estimation with Nested Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.05534","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":"sha256:86488e5a006ec23f57cbeb0c6eec7cc81f3ccc89593d7eaab659c23020809ad6","target":"record","created_at":"2026-05-17T23:48:49Z","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":"ad0502008e74238435492ba9c0644b99ed7d561720ab2cef64e6bf9f74380a82","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-04-11T05:09:47Z","title_canon_sha256":"731ed1bae5c517662d0c111cbf877a92a7268c82b112e003eb3763cee0203609"},"schema_version":"1.0","source":{"id":"1904.05534","kind":"arxiv","version":1}},"canonical_sha256":"06ffadb281a0d8dcd24671391b415e473d6ac790fe416fa39059efd2ec2e2bae","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"06ffadb281a0d8dcd24671391b415e473d6ac790fe416fa39059efd2ec2e2bae","first_computed_at":"2026-05-17T23:48:49.234694Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:49.234694Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mFsfavfqamZbNEvuJ8vLZhQf/5UeirZ7rCD+La0TcOmWbCjFwu+KukFuN2/WkVOjZGkPMxDlRrnBg2MxNaP8Dg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:49.235265Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.05534","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:86488e5a006ec23f57cbeb0c6eec7cc81f3ccc89593d7eaab659c23020809ad6","sha256:7ee7d94a39d8794a6de9f0c6bf2158538d8f2ba47c8337b1a37342f157d959f9"],"state_sha256":"025ab30b6a647a7eaec886e49aafbf04359bbd5c6f6555773ac4d09f107341bd"}