{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:RFUJRRLPXLYYXMKH6H74TS4HCC","short_pith_number":"pith:RFUJRRLP","canonical_record":{"source":{"id":"2507.20792","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SY","submitted_at":"2025-07-28T13:03:16Z","cross_cats_sorted":["cs.SY","eess.SP"],"title_canon_sha256":"6492e49020c01343c571ce7b3b1054b3023ca980f2f519fd16cfd9f5d44d9b6e","abstract_canon_sha256":"0db49c09f2463ba4edfc51d8ef481980d7548a2c9b97c9fe6c3629359222e901"},"schema_version":"1.0"},"canonical_sha256":"896898c56fbaf18bb147f1ffc9cb8710949c1bf6b39d03d5cb2395dd1327c719","source":{"kind":"arxiv","id":"2507.20792","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.20792","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"arxiv_version","alias_value":"2507.20792v1","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.20792","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_12","alias_value":"RFUJRRLPXLYY","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_16","alias_value":"RFUJRRLPXLYYXMKH","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_8","alias_value":"RFUJRRLP","created_at":"2026-07-05T11:44:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:RFUJRRLPXLYYXMKH6H74TS4HCC","target":"record","payload":{"canonical_record":{"source":{"id":"2507.20792","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SY","submitted_at":"2025-07-28T13:03:16Z","cross_cats_sorted":["cs.SY","eess.SP"],"title_canon_sha256":"6492e49020c01343c571ce7b3b1054b3023ca980f2f519fd16cfd9f5d44d9b6e","abstract_canon_sha256":"0db49c09f2463ba4edfc51d8ef481980d7548a2c9b97c9fe6c3629359222e901"},"schema_version":"1.0"},"canonical_sha256":"896898c56fbaf18bb147f1ffc9cb8710949c1bf6b39d03d5cb2395dd1327c719","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:44:25.883995Z","signature_b64":"Wv5oQyKSBakzUVbhwINXwU0xnl0QcefBn/ljPKn1Is3x+GDsEJ33sB38XQIKAKHsUOlYbHs1Adp3Uyw7BHtYAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"896898c56fbaf18bb147f1ffc9cb8710949c1bf6b39d03d5cb2395dd1327c719","last_reissued_at":"2026-07-05T11:44:25.883571Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:44:25.883571Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.20792","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:44:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PBx5nDL5R3DNA4hhcuXsfGYHunHS3z66gBAG1RykkA45G1Ci7FZ4fJEp2YHPFGvvLwide19Eo+m+M7xUVIxTCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T00:35:07.567838Z"},"content_sha256":"b453b03021733e374950f0fd9592ffcb1922cc9695a7650e2ac3212698692ded","schema_version":"1.0","event_id":"sha256:b453b03021733e374950f0fd9592ffcb1922cc9695a7650e2ac3212698692ded"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:RFUJRRLPXLYYXMKH6H74TS4HCC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"UAV-Borne Digital Radar System for Coherent Multistatic SAR Imaging","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.SY","eess.SP"],"primary_cat":"eess.SY","authors_text":"Alexander Grathwohl, Christian Gesell, Christian Waldschmidt, Christina Bonfert, David Werbunat, Julian Aguilar, Julian Kanz, Martin Vossiek","submitted_at":"2025-07-28T13:03:16Z","abstract_excerpt":"Advancements in analog-to-digital converter (ADC) technology have enabled higher sampling rates, making it feasible to adopt digital radar architectures that directly sample the radio-frequency (RF) signal, eliminating the need for analog downconversion. This digital approach supports greater flexibility in waveform design and signal processing, particularly through digital modulation schemes like orthogonal frequency division multiplexing (OFDM). This paper presents a digital radar system mounted on an uncrewed aerial vehicle (UAV), which employs OFDM waveforms for coherent multistatic synthe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.20792","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.20792/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T11:44:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9iT5Jr99ic8sC0GbGXcTGWvi9Bp/k3Miw4PY3b/aXXlzrvxNY9Bdlno0SmAO6kmV8civtuA9lfTBnEBxeiuEAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T00:35:07.568784Z"},"content_sha256":"764612d3539f823709cd38cfd9df3bd050afb39643a4f73d277cced92365521d","schema_version":"1.0","event_id":"sha256:764612d3539f823709cd38cfd9df3bd050afb39643a4f73d277cced92365521d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/bundle.json","state_url":"https://pith.science/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/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":"2026-08-05T00:35:07Z","links":{"resolver":"https://pith.science/pith/RFUJRRLPXLYYXMKH6H74TS4HCC","bundle":"https://pith.science/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/bundle.json","state":"https://pith.science/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RFUJRRLPXLYYXMKH6H74TS4HCC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:RFUJRRLPXLYYXMKH6H74TS4HCC","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":"0db49c09f2463ba4edfc51d8ef481980d7548a2c9b97c9fe6c3629359222e901","cross_cats_sorted":["cs.SY","eess.SP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SY","submitted_at":"2025-07-28T13:03:16Z","title_canon_sha256":"6492e49020c01343c571ce7b3b1054b3023ca980f2f519fd16cfd9f5d44d9b6e"},"schema_version":"1.0","source":{"id":"2507.20792","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.20792","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"arxiv_version","alias_value":"2507.20792v1","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.20792","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_12","alias_value":"RFUJRRLPXLYY","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_16","alias_value":"RFUJRRLPXLYYXMKH","created_at":"2026-07-05T11:44:25Z"},{"alias_kind":"pith_short_8","alias_value":"RFUJRRLP","created_at":"2026-07-05T11:44:25Z"}],"graph_snapshots":[{"event_id":"sha256:764612d3539f823709cd38cfd9df3bd050afb39643a4f73d277cced92365521d","target":"graph","created_at":"2026-07-05T11:44:25Z","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/2507.20792/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Advancements in analog-to-digital converter (ADC) technology have enabled higher sampling rates, making it feasible to adopt digital radar architectures that directly sample the radio-frequency (RF) signal, eliminating the need for analog downconversion. This digital approach supports greater flexibility in waveform design and signal processing, particularly through digital modulation schemes like orthogonal frequency division multiplexing (OFDM). This paper presents a digital radar system mounted on an uncrewed aerial vehicle (UAV), which employs OFDM waveforms for coherent multistatic synthe","authors_text":"Alexander Grathwohl, Christian Gesell, Christian Waldschmidt, Christina Bonfert, David Werbunat, Julian Aguilar, Julian Kanz, Martin Vossiek","cross_cats":["cs.SY","eess.SP"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SY","submitted_at":"2025-07-28T13:03:16Z","title":"UAV-Borne Digital Radar System for Coherent Multistatic SAR Imaging"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.20792","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:b453b03021733e374950f0fd9592ffcb1922cc9695a7650e2ac3212698692ded","target":"record","created_at":"2026-07-05T11:44:25Z","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":"0db49c09f2463ba4edfc51d8ef481980d7548a2c9b97c9fe6c3629359222e901","cross_cats_sorted":["cs.SY","eess.SP"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"eess.SY","submitted_at":"2025-07-28T13:03:16Z","title_canon_sha256":"6492e49020c01343c571ce7b3b1054b3023ca980f2f519fd16cfd9f5d44d9b6e"},"schema_version":"1.0","source":{"id":"2507.20792","kind":"arxiv","version":1}},"canonical_sha256":"896898c56fbaf18bb147f1ffc9cb8710949c1bf6b39d03d5cb2395dd1327c719","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"896898c56fbaf18bb147f1ffc9cb8710949c1bf6b39d03d5cb2395dd1327c719","first_computed_at":"2026-07-05T11:44:25.883571Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:44:25.883571Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Wv5oQyKSBakzUVbhwINXwU0xnl0QcefBn/ljPKn1Is3x+GDsEJ33sB38XQIKAKHsUOlYbHs1Adp3Uyw7BHtYAw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:44:25.883995Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.20792","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b453b03021733e374950f0fd9592ffcb1922cc9695a7650e2ac3212698692ded","sha256:764612d3539f823709cd38cfd9df3bd050afb39643a4f73d277cced92365521d"],"state_sha256":"1a758347299329eb7c7d4ffca4dce54589327619d76e2f0d2077826828011678"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dtwuYvFkpsVahyeTlz9cOZ5cEmy9KzbnFHDAgfsOmVI5ma+yLJRcqmSQ/FbpmRgGBHR7PHrdAW7y9qLkqgTVBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T00:35:07.573624Z","bundle_sha256":"4f2482e2b154b59c6f3d42b19a77d100014abf1874715fefd927270ee5fbd94e"}}