{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:WGRFZN7HEV4COYZTWBDUDWLRTY","short_pith_number":"pith:WGRFZN7H","canonical_record":{"source":{"id":"1106.5346","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-06-27T10:17:12Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"bac12bc2d5da979afe2460a86d827209db0191a7dbaa662669ea6a7835866382","abstract_canon_sha256":"1cd4ab58cfc845032a6f4507053b599d8b863645d68b5b6f9e567dd2e840092c"},"schema_version":"1.0"},"canonical_sha256":"b1a25cb7e72578276333b04741d9719e18875a04dccd6b769c33d2ee14603790","source":{"kind":"arxiv","id":"1106.5346","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1106.5346","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"arxiv_version","alias_value":"1106.5346v2","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.5346","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"pith_short_12","alias_value":"WGRFZN7HEV4C","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WGRFZN7HEV4COYZT","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WGRFZN7H","created_at":"2026-05-18T12:26:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:WGRFZN7HEV4COYZTWBDUDWLRTY","target":"record","payload":{"canonical_record":{"source":{"id":"1106.5346","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-06-27T10:17:12Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"bac12bc2d5da979afe2460a86d827209db0191a7dbaa662669ea6a7835866382","abstract_canon_sha256":"1cd4ab58cfc845032a6f4507053b599d8b863645d68b5b6f9e567dd2e840092c"},"schema_version":"1.0"},"canonical_sha256":"b1a25cb7e72578276333b04741d9719e18875a04dccd6b769c33d2ee14603790","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:08:12.385532Z","signature_b64":"m/89D2s5lB6VMB0aCBJMs62Ho6LBqIfAicM6Di5g6qa7egL7d6gM8KQ6rfyJcA+ccWRD8z8dGRYsSO+oEGr6BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1a25cb7e72578276333b04741d9719e18875a04dccd6b769c33d2ee14603790","last_reissued_at":"2026-05-18T04:08:12.385061Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:08:12.385061Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1106.5346","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:08:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vMLugQ1pTnoTIOQWfhtBV0nIcg0ge2mPOnV6sXHvF3MLcs609XbfifK+pzK6r+sXySSkVpSbjMAzdTVpW4LcAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T10:47:11.133737Z"},"content_sha256":"648e8f72316c7f8a86f1fcdda4545d0fd3d08dca61d8ecbc6534cc8d7dee9d47","schema_version":"1.0","event_id":"sha256:648e8f72316c7f8a86f1fcdda4545d0fd3d08dca61d8ecbc6534cc8d7dee9d47"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:WGRFZN7HEV4COYZTWBDUDWLRTY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reconstruction and Estimation of Scattering Functions of Overspread Radar Targets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"G\\\"otz Pfander, Onur Oktay, Pavel Zheltov","submitted_at":"2011-06-27T10:17:12Z","abstract_excerpt":"In many radar scenarios, the radar target or the medium is assumed to possess randomly varying parts. The properties of a target are described by a random process known as the spreading function. Its second order statistics under the WSSUS assumption are given by the scattering function. Recent developments in the operator identification theory suggest a channel sounding procedure that allows to determine the spreading function given complete statistical knowledge of the operator echo. We show that in a continuous model it is indeed theoretically possible to identify a scattering function of a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.5346","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T04:08:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RsufxK15jCuHy0UIAv82P/TixiAXUeWRA0oIyE2y3SP5hE5xSZ/trdOzkCk5PXMP3NEsvBc6wIhnFTF73FnnBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T10:47:11.134091Z"},"content_sha256":"36aa226763a92e876eccd0bb5a7f13d831d0c3b01fb34902d6abba03d8cd1e61","schema_version":"1.0","event_id":"sha256:36aa226763a92e876eccd0bb5a7f13d831d0c3b01fb34902d6abba03d8cd1e61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/bundle.json","state_url":"https://pith.science/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/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":"2026-06-01T10:47:11Z","links":{"resolver":"https://pith.science/pith/WGRFZN7HEV4COYZTWBDUDWLRTY","bundle":"https://pith.science/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/bundle.json","state":"https://pith.science/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WGRFZN7HEV4COYZTWBDUDWLRTY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:WGRFZN7HEV4COYZTWBDUDWLRTY","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":"1cd4ab58cfc845032a6f4507053b599d8b863645d68b5b6f9e567dd2e840092c","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-06-27T10:17:12Z","title_canon_sha256":"bac12bc2d5da979afe2460a86d827209db0191a7dbaa662669ea6a7835866382"},"schema_version":"1.0","source":{"id":"1106.5346","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1106.5346","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"arxiv_version","alias_value":"1106.5346v2","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.5346","created_at":"2026-05-18T04:08:12Z"},{"alias_kind":"pith_short_12","alias_value":"WGRFZN7HEV4C","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WGRFZN7HEV4COYZT","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WGRFZN7H","created_at":"2026-05-18T12:26:44Z"}],"graph_snapshots":[{"event_id":"sha256:36aa226763a92e876eccd0bb5a7f13d831d0c3b01fb34902d6abba03d8cd1e61","target":"graph","created_at":"2026-05-18T04:08:12Z","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":"In many radar scenarios, the radar target or the medium is assumed to possess randomly varying parts. The properties of a target are described by a random process known as the spreading function. Its second order statistics under the WSSUS assumption are given by the scattering function. Recent developments in the operator identification theory suggest a channel sounding procedure that allows to determine the spreading function given complete statistical knowledge of the operator echo. We show that in a continuous model it is indeed theoretically possible to identify a scattering function of a","authors_text":"G\\\"otz Pfander, Onur Oktay, Pavel Zheltov","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-06-27T10:17:12Z","title":"Reconstruction and Estimation of Scattering Functions of Overspread Radar Targets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.5346","kind":"arxiv","version":2},"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":"sha256:648e8f72316c7f8a86f1fcdda4545d0fd3d08dca61d8ecbc6534cc8d7dee9d47","target":"record","created_at":"2026-05-18T04:08:12Z","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":"1cd4ab58cfc845032a6f4507053b599d8b863645d68b5b6f9e567dd2e840092c","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2011-06-27T10:17:12Z","title_canon_sha256":"bac12bc2d5da979afe2460a86d827209db0191a7dbaa662669ea6a7835866382"},"schema_version":"1.0","source":{"id":"1106.5346","kind":"arxiv","version":2}},"canonical_sha256":"b1a25cb7e72578276333b04741d9719e18875a04dccd6b769c33d2ee14603790","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b1a25cb7e72578276333b04741d9719e18875a04dccd6b769c33d2ee14603790","first_computed_at":"2026-05-18T04:08:12.385061Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:08:12.385061Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"m/89D2s5lB6VMB0aCBJMs62Ho6LBqIfAicM6Di5g6qa7egL7d6gM8KQ6rfyJcA+ccWRD8z8dGRYsSO+oEGr6BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:08:12.385532Z","signed_message":"canonical_sha256_bytes"},"source_id":"1106.5346","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:648e8f72316c7f8a86f1fcdda4545d0fd3d08dca61d8ecbc6534cc8d7dee9d47","sha256:36aa226763a92e876eccd0bb5a7f13d831d0c3b01fb34902d6abba03d8cd1e61"],"state_sha256":"db1a7c47195dceaf5e41d228296560d90ee36247184978e30602718953d144db"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pJiMvIN17e8v2KFVDZhx0vy8W3Ez7iAIrJfxDtLkeKpQ5IKmGLGkFR6xmhOJ8DnovFz17qJpZf1O5/9c3mTuAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T10:47:11.136130Z","bundle_sha256":"bb3624550da3b8b437a8a296b5d38631ecf078375ca9c78775bd72a77c282a23"}}