{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:A66KDTR2NBXFHML6ISD4PYTS34","short_pith_number":"pith:A66KDTR2","canonical_record":{"source":{"id":"2108.04095","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-08-09T14:52:52Z","cross_cats_sorted":[],"title_canon_sha256":"0bc5a271c998f115a35ddf93daba4186707ae024e8cfd8e949507522c642078f","abstract_canon_sha256":"f132dbc403bc5353b8445b0623360a11c4d3d0042f3258c16bcef5463f7b434c"},"schema_version":"1.0"},"canonical_sha256":"07bca1ce3a686e53b17e4487c7e272df2cf32af33847c0279edc1c7230be7c6a","source":{"kind":"arxiv","id":"2108.04095","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.04095","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"arxiv_version","alias_value":"2108.04095v1","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.04095","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_12","alias_value":"A66KDTR2NBXF","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_16","alias_value":"A66KDTR2NBXFHML6","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_8","alias_value":"A66KDTR2","created_at":"2026-07-05T03:54:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:A66KDTR2NBXFHML6ISD4PYTS34","target":"record","payload":{"canonical_record":{"source":{"id":"2108.04095","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-08-09T14:52:52Z","cross_cats_sorted":[],"title_canon_sha256":"0bc5a271c998f115a35ddf93daba4186707ae024e8cfd8e949507522c642078f","abstract_canon_sha256":"f132dbc403bc5353b8445b0623360a11c4d3d0042f3258c16bcef5463f7b434c"},"schema_version":"1.0"},"canonical_sha256":"07bca1ce3a686e53b17e4487c7e272df2cf32af33847c0279edc1c7230be7c6a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:54:59.461137Z","signature_b64":"2ZaYlf2WJYRV/U89CE4p4kUpZu6coNB+jpslPe2b0S5z0XBZUgJFX/PGcd4hGLUB/3SxEieDOYQsLNkc+9VVDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"07bca1ce3a686e53b17e4487c7e272df2cf32af33847c0279edc1c7230be7c6a","last_reissued_at":"2026-07-05T03:54:59.460654Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:54:59.460654Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.04095","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":"2026-07-05T03:54:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5OFnYrx6McJkhN+yIcvCD4yMOCJa5KzZ4Txj6HhLLpUs4GrYsfjw7RxiLObcBt/SM7IlB52p6leF6IhiFcifAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T06:54:12.672659Z"},"content_sha256":"678272b2099cb0cdaacbfb87809ea1db26c7ee248e3d828bfe3c8d24e2e91679","schema_version":"1.0","event_id":"sha256:678272b2099cb0cdaacbfb87809ea1db26c7ee248e3d828bfe3c8d24e2e91679"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:A66KDTR2NBXFHML6ISD4PYTS34","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Joint Active and Passive Beamforming for IRS-Assisted Radar","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Fangzhou Wang, Hongbin Li, Jun Fang","submitted_at":"2021-08-09T14:52:52Z","abstract_excerpt":"Intelligent reflecting surface (IRS) is a promising technology being considered for future wireless communications due to its ability to control signal propagation. This paper considers the joint active and passive beamforming problem for an IRS-assisted radar, where multiple IRSs are deployed to assist the surveillance of multiple targets in cluttered environments. Specifically, we aim to maximize the minimum target illumination power at multiple target locations by jointly optimizing the active beamformer at the radar transmitter and the passive phase-shift matrices at the IRSs, subject to a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.04095","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/2108.04095/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":"2026-07-05T03:54:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hZbu5ip1ZFtCIZCfTeO96wNAiTmhUur103LlvAIZJFEyXagqGtEP5jLoD2o10qa0nzZLVrs2ib/63uYfsIF8CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T06:54:12.674179Z"},"content_sha256":"5abdfa40e6b2e6bd263ce977e6c97427c6fa6a98d782ff38b7dc7a465b53ef33","schema_version":"1.0","event_id":"sha256:5abdfa40e6b2e6bd263ce977e6c97427c6fa6a98d782ff38b7dc7a465b53ef33"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/A66KDTR2NBXFHML6ISD4PYTS34/bundle.json","state_url":"https://pith.science/pith/A66KDTR2NBXFHML6ISD4PYTS34/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/A66KDTR2NBXFHML6ISD4PYTS34/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":"2026-08-18T06:54:12Z","links":{"resolver":"https://pith.science/pith/A66KDTR2NBXFHML6ISD4PYTS34","bundle":"https://pith.science/pith/A66KDTR2NBXFHML6ISD4PYTS34/bundle.json","state":"https://pith.science/pith/A66KDTR2NBXFHML6ISD4PYTS34/state.json","well_known_bundle":"https://pith.science/.well-known/pith/A66KDTR2NBXFHML6ISD4PYTS34/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:A66KDTR2NBXFHML6ISD4PYTS34","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":"f132dbc403bc5353b8445b0623360a11c4d3d0042f3258c16bcef5463f7b434c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-08-09T14:52:52Z","title_canon_sha256":"0bc5a271c998f115a35ddf93daba4186707ae024e8cfd8e949507522c642078f"},"schema_version":"1.0","source":{"id":"2108.04095","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.04095","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"arxiv_version","alias_value":"2108.04095v1","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.04095","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_12","alias_value":"A66KDTR2NBXF","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_16","alias_value":"A66KDTR2NBXFHML6","created_at":"2026-07-05T03:54:59Z"},{"alias_kind":"pith_short_8","alias_value":"A66KDTR2","created_at":"2026-07-05T03:54:59Z"}],"graph_snapshots":[{"event_id":"sha256:5abdfa40e6b2e6bd263ce977e6c97427c6fa6a98d782ff38b7dc7a465b53ef33","target":"graph","created_at":"2026-07-05T03:54:59Z","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/2108.04095/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Intelligent reflecting surface (IRS) is a promising technology being considered for future wireless communications due to its ability to control signal propagation. This paper considers the joint active and passive beamforming problem for an IRS-assisted radar, where multiple IRSs are deployed to assist the surveillance of multiple targets in cluttered environments. Specifically, we aim to maximize the minimum target illumination power at multiple target locations by jointly optimizing the active beamformer at the radar transmitter and the passive phase-shift matrices at the IRSs, subject to a","authors_text":"Fangzhou Wang, Hongbin Li, Jun Fang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-08-09T14:52:52Z","title":"Joint Active and Passive Beamforming for IRS-Assisted Radar"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.04095","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":"sha256:678272b2099cb0cdaacbfb87809ea1db26c7ee248e3d828bfe3c8d24e2e91679","target":"record","created_at":"2026-07-05T03:54:59Z","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":"f132dbc403bc5353b8445b0623360a11c4d3d0042f3258c16bcef5463f7b434c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2021-08-09T14:52:52Z","title_canon_sha256":"0bc5a271c998f115a35ddf93daba4186707ae024e8cfd8e949507522c642078f"},"schema_version":"1.0","source":{"id":"2108.04095","kind":"arxiv","version":1}},"canonical_sha256":"07bca1ce3a686e53b17e4487c7e272df2cf32af33847c0279edc1c7230be7c6a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"07bca1ce3a686e53b17e4487c7e272df2cf32af33847c0279edc1c7230be7c6a","first_computed_at":"2026-07-05T03:54:59.460654Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:54:59.460654Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2ZaYlf2WJYRV/U89CE4p4kUpZu6coNB+jpslPe2b0S5z0XBZUgJFX/PGcd4hGLUB/3SxEieDOYQsLNkc+9VVDg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:54:59.461137Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.04095","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:678272b2099cb0cdaacbfb87809ea1db26c7ee248e3d828bfe3c8d24e2e91679","sha256:5abdfa40e6b2e6bd263ce977e6c97427c6fa6a98d782ff38b7dc7a465b53ef33"],"state_sha256":"eac26a0ec58789205fa5f743a3107b234ad249848543df54bf9bc70b454f41b1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4bwEn3zFkl9kTHnfQ1U/A6BEMn3uUOeYU5VzPHHmMfP3U3wVX2qZoHA9GBYCVRGk3rFTwTxgGMPTfqHA0exuCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T06:54:12.680836Z","bundle_sha256":"113f4768177b2074a3779440b7abf534ab36ac6ec24ba8221fb61a2ceee3413f"}}