{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:6XURVESHV7NR4M2EB7JGQE5ASD","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":"924f33a631920323cb5a37840488584f7600abcdeaf973003d8b4ca8b66192a1","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-03-31T15:13:26Z","title_canon_sha256":"c91b1c06ae48af63027c7e666909d60dec9eeb519476c04f047e30a6c6c1360f"},"schema_version":"1.0","source":{"id":"2103.17149","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.17149","created_at":"2026-07-05T02:28:13Z"},{"alias_kind":"arxiv_version","alias_value":"2103.17149v1","created_at":"2026-07-05T02:28:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.17149","created_at":"2026-07-05T02:28:13Z"},{"alias_kind":"pith_short_12","alias_value":"6XURVESHV7NR","created_at":"2026-07-05T02:28:13Z"},{"alias_kind":"pith_short_16","alias_value":"6XURVESHV7NR4M2E","created_at":"2026-07-05T02:28:13Z"},{"alias_kind":"pith_short_8","alias_value":"6XURVESH","created_at":"2026-07-05T02:28:13Z"}],"graph_snapshots":[{"event_id":"sha256:005c6a23265169c60c05c199e81fdaef75c6870f7b61c945330c621663d1ee14","target":"graph","created_at":"2026-07-05T02:28:13Z","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/2103.17149/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Wireless communication at millimeter wave frequencies has attracted considerable attention for the delivery of high-bit-rate connectivity to unmanned aerial vehicles (UAVs). However, conducting the channel measurements necessary to assess communication at these frequencies has been challenging due to the severe payload and power restrictions in commercial UAVs. This work presents a novel lightweight (approximately 1.3 kg) channel measurement system at 28 GHz installed on a commercially available UAV. A ground transmitter equipped with a horn antenna conveys sounding signals to a UAV equipped w","authors_text":"Angel Lozano, Giovanni Geraci, Giuseppe Loianno, Ismo Huhtinen, Jaakko Haarla, Marco Mezzavilla, Seongjoon Kang, Sundeep Rangan, Vasilii Semkin, William Xia","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-03-31T15:13:26Z","title":"Lightweight UAV-based Measurement System for Air-to-Ground Channels at 28 GHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.17149","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":"sha256:242b7181a1defb0466407a3b9bfdfd2bc0bd0544d64b74d003099cf4045d55b5","target":"record","created_at":"2026-07-05T02:28:13Z","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":"924f33a631920323cb5a37840488584f7600abcdeaf973003d8b4ca8b66192a1","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SP","submitted_at":"2021-03-31T15:13:26Z","title_canon_sha256":"c91b1c06ae48af63027c7e666909d60dec9eeb519476c04f047e30a6c6c1360f"},"schema_version":"1.0","source":{"id":"2103.17149","kind":"arxiv","version":1}},"canonical_sha256":"f5e91a9247afdb1e33440fd26813a090f8ae567852332f95d3acb8ca368e0301","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f5e91a9247afdb1e33440fd26813a090f8ae567852332f95d3acb8ca368e0301","first_computed_at":"2026-07-05T02:28:13.281752Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:28:13.281752Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DH+1VloLvY5KPnfue4/mpXpICy0ZJSvnik0m/JzoSp16cr94MgsaGOruy8GaunQAS83m/xXAgIF5/sVyCwkyCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:28:13.282102Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.17149","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:242b7181a1defb0466407a3b9bfdfd2bc0bd0544d64b74d003099cf4045d55b5","sha256:005c6a23265169c60c05c199e81fdaef75c6870f7b61c945330c621663d1ee14"],"state_sha256":"68b6752930c5190a19087fefcbb6b1ba0f3c527ee56f5796433b195790c5de28"}