{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:XIYARGDZZOBW6UIUZ35DTTL7RF","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":"c626aff42d575940c90c2c32ca2b41c39a8fae9a2c29b733781a28046624e539","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-04-08T10:25:18Z","title_canon_sha256":"2b5d704f0955188a5964d2fcac0164b19b7cfffb531d65d48d40063a725ef700"},"schema_version":"1.0","source":{"id":"1404.2077","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1404.2077","created_at":"2026-05-18T02:54:38Z"},{"alias_kind":"arxiv_version","alias_value":"1404.2077v1","created_at":"2026-05-18T02:54:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1404.2077","created_at":"2026-05-18T02:54:38Z"},{"alias_kind":"pith_short_12","alias_value":"XIYARGDZZOBW","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XIYARGDZZOBW6UIU","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XIYARGDZ","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:dc8bc4faa752f1a166ecda2ee5538e99bbe065bee9fed14521cb4ab3d3c3c390","target":"graph","created_at":"2026-05-18T02:54:38Z","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":"Today, wide-open, high-resolution Doppler frequency shift (DFS) estimation is essential for radar, microwave/millimeter-wave, and communication systems. Using photonics technology, an effective approach is proposed and experimentally demonstrated, providing a high-resolution and frequency-independent solution. In the approach consisting of two cascaded opto-electronic modulators, DFS between the transmitted microwave/ millimeter-wave signal and the received echo signal is mapped into a doubled spacing between two target optical sidebands. Subsequently, the DFS is then estimated through the spe","authors_text":"Bing Lu, Lianshan Yan, Liyang Shao, Wangzhe Li, Wei Pan, Xihua Zou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-04-08T10:25:18Z","title":"Wide-open, high-resolution microwave/millimeter-wave Doppler frequency shift estimation using photonics technology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.2077","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:afae3b68721b1644534b8c59e24e59eff395d181efe971f91fefa55bb100f813","target":"record","created_at":"2026-05-18T02:54:38Z","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":"c626aff42d575940c90c2c32ca2b41c39a8fae9a2c29b733781a28046624e539","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-04-08T10:25:18Z","title_canon_sha256":"2b5d704f0955188a5964d2fcac0164b19b7cfffb531d65d48d40063a725ef700"},"schema_version":"1.0","source":{"id":"1404.2077","kind":"arxiv","version":1}},"canonical_sha256":"ba30089879cb836f5114cefa39cd7f8943d80db4e2cb1f02b614491abd807b13","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ba30089879cb836f5114cefa39cd7f8943d80db4e2cb1f02b614491abd807b13","first_computed_at":"2026-05-18T02:54:38.598403Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:54:38.598403Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8DzGu/C1wyLTw+o5d1BMq3owkEx5hv6KnIL7Iesm9QSNuIPCHYOtDKfs0aUj1DEpBSKWzdtRtdiU0Ao+A4OEAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:54:38.599013Z","signed_message":"canonical_sha256_bytes"},"source_id":"1404.2077","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afae3b68721b1644534b8c59e24e59eff395d181efe971f91fefa55bb100f813","sha256:dc8bc4faa752f1a166ecda2ee5538e99bbe065bee9fed14521cb4ab3d3c3c390"],"state_sha256":"a14633f9a3c0a43bb4dcbec7c3409762d1a066f3ebe03a624e0b3adb0b0a7ff6"}