{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:6DAHILX6BLSUQS34NE7R7L5MTG","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":"31ef134d61c688a0018e701ea09f37a54a113b7e06c4fe392e65c889fc2f0b1c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-02-12T17:28:37Z","title_canon_sha256":"2b26af218c49a27184d74e0b4e59c6cd5b775dc51c1e498bb2418d9f16874d0e"},"schema_version":"1.0","source":{"id":"2502.08592","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.08592","created_at":"2026-07-05T10:13:25Z"},{"alias_kind":"arxiv_version","alias_value":"2502.08592v1","created_at":"2026-07-05T10:13:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.08592","created_at":"2026-07-05T10:13:25Z"},{"alias_kind":"pith_short_12","alias_value":"6DAHILX6BLSU","created_at":"2026-07-05T10:13:25Z"},{"alias_kind":"pith_short_16","alias_value":"6DAHILX6BLSUQS34","created_at":"2026-07-05T10:13:25Z"},{"alias_kind":"pith_short_8","alias_value":"6DAHILX6","created_at":"2026-07-05T10:13:25Z"}],"graph_snapshots":[{"event_id":"sha256:d241f6ffbed80c9b46d4e57aec3d9dee3cbc8bdf1f8e280b02e84c817031a4fa","target":"graph","created_at":"2026-07-05T10:13:25Z","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/2502.08592/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Accurate Direction of Arrival (DoA) estimation is critical for applications in robotics and communication, but high costs and complexity of coherent multi-channel receivers hinder accessibility. This work proposes a cost-effective DoA estimation system for continuous wave (CW) signals in the 2.4 GHz ISM band. A two-channel software-defined radio (SDR) with time-division multiplexing (TDM) enables pseudo-coherent sampling of an eight-element uniform circular array (UCA) with low hardware complexity. A central reference antenna mitigates phase jitter and sampling errors. The system applies an en","authors_text":"Lennart Werner, Marco Hutter, Markus Gardill","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-02-12T17:28:37Z","title":"Direction Finding for Software Defined Radios with Switched Uniform Circular Arrays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.08592","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":"sha256:8cb12bef5e71d87b15838fbc55ddf0fa4e062ca03a7546440b00826c0416e89f","target":"record","created_at":"2026-07-05T10:13:25Z","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":"31ef134d61c688a0018e701ea09f37a54a113b7e06c4fe392e65c889fc2f0b1c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-02-12T17:28:37Z","title_canon_sha256":"2b26af218c49a27184d74e0b4e59c6cd5b775dc51c1e498bb2418d9f16874d0e"},"schema_version":"1.0","source":{"id":"2502.08592","kind":"arxiv","version":1}},"canonical_sha256":"f0c0742efe0ae5484b7c693f1fafac99bbd6c27e18f429a341f7e8affc4b8dfb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f0c0742efe0ae5484b7c693f1fafac99bbd6c27e18f429a341f7e8affc4b8dfb","first_computed_at":"2026-07-05T10:13:25.049094Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:13:25.049094Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"P450PkZWVverVZGfCmttzyQCjVmABo7s5tzW17WiX9lrV6jnlfxirhV6AFmMispxz3yvaAFFVnVDrgUR7P8rDA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:13:25.049642Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.08592","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8cb12bef5e71d87b15838fbc55ddf0fa4e062ca03a7546440b00826c0416e89f","sha256:d241f6ffbed80c9b46d4e57aec3d9dee3cbc8bdf1f8e280b02e84c817031a4fa"],"state_sha256":"4747c8ce274fbad79feb1d50fd25b8bae105e56695b37839649f148f2b12a423"}