{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:G7QTJCRFVZAQ7FHY64ZVTPICAD","short_pith_number":"pith:G7QTJCRF","canonical_record":{"source":{"id":"1202.5110","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-02-23T08:27:23Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"e1559938ba7b53852ff93e149ae59ec6ff2302cad96c18fede2c8ad0a52b76d6","abstract_canon_sha256":"ae26b15e4c28c7949873b65e7f0d73c925b66c3f75e8991ea7748f68c0f4a26a"},"schema_version":"1.0"},"canonical_sha256":"37e1348a25ae410f94f8f73359bd0200f8a034a5a86ec7599ea5d5a4ad40552b","source":{"kind":"arxiv","id":"1202.5110","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5110","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5110v4","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5110","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"pith_short_12","alias_value":"G7QTJCRFVZAQ","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"G7QTJCRFVZAQ7FHY","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"G7QTJCRF","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:G7QTJCRFVZAQ7FHY64ZVTPICAD","target":"record","payload":{"canonical_record":{"source":{"id":"1202.5110","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-02-23T08:27:23Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"e1559938ba7b53852ff93e149ae59ec6ff2302cad96c18fede2c8ad0a52b76d6","abstract_canon_sha256":"ae26b15e4c28c7949873b65e7f0d73c925b66c3f75e8991ea7748f68c0f4a26a"},"schema_version":"1.0"},"canonical_sha256":"37e1348a25ae410f94f8f73359bd0200f8a034a5a86ec7599ea5d5a4ad40552b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:41:21.468008Z","signature_b64":"FOGpFSnEewiLKLKqbODFhSGDfN+Q/cSv73trLN0OPKXs+5nhXegQ+nC6Jh11S+byHAz4mMjAY0BLbRRS7TGODQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37e1348a25ae410f94f8f73359bd0200f8a034a5a86ec7599ea5d5a4ad40552b","last_reissued_at":"2026-05-18T03:41:21.467408Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:41:21.467408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.5110","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:41:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3lWSdthCxbeJZexizV6VyN9gbE7Yk/XGjpnZKqqk6YRxz/f/fp7sSe5CfG9I07yqrdk5WBHNBYM8eGHNZbFKBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:26:32.066623Z"},"content_sha256":"2c57be30b34e1335e038006f0f1190b0adc8ae361be2f77bd8a0ccff3133b3ce","schema_version":"1.0","event_id":"sha256:2c57be30b34e1335e038006f0f1190b0adc8ae361be2f77bd8a0ccff3133b3ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:G7QTJCRFVZAQ7FHY64ZVTPICAD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ISAR Image Formation Using Sequential Minimization of L0 and L2 Norms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Gang Li, Wei Rao, Xiang-Gen Xia, Xiqin Wang","submitted_at":"2012-02-23T08:27:23Z","abstract_excerpt":"A sparsity-driven algorithm of inverse synthetic aperture radar (ISAR) imaging is proposed. Based on the parametric sparse representation of the received ISAR signal, the problem of ISAR image formation is converted into the joint estimation of the target rotation rate and the sparse power distribution in the spatial domain. This goal is achieved by sequential minimization of L0 and L2 norms, which ensure the sparsest ISAR image and the minimum recovery error, respectively."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5110","kind":"arxiv","version":4},"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":"2026-05-18T03:41:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fkUM8udvzyoct9x4A2JNUj8yWboCjIMv3VR7u2m6zpMeh+UmfSWBJTtUrgptFUiXhgDIT4MR1oyXSYTHQblwBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:26:32.066962Z"},"content_sha256":"5f5311cd1dbe57d4b000cd7976afa2644751341209bacd39d3e3a566f973ed33","schema_version":"1.0","event_id":"sha256:5f5311cd1dbe57d4b000cd7976afa2644751341209bacd39d3e3a566f973ed33"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/bundle.json","state_url":"https://pith.science/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/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":"2026-06-02T09:26:32Z","links":{"resolver":"https://pith.science/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD","bundle":"https://pith.science/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/bundle.json","state":"https://pith.science/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G7QTJCRFVZAQ7FHY64ZVTPICAD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:G7QTJCRFVZAQ7FHY64ZVTPICAD","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":"ae26b15e4c28c7949873b65e7f0d73c925b66c3f75e8991ea7748f68c0f4a26a","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-02-23T08:27:23Z","title_canon_sha256":"e1559938ba7b53852ff93e149ae59ec6ff2302cad96c18fede2c8ad0a52b76d6"},"schema_version":"1.0","source":{"id":"1202.5110","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5110","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5110v4","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5110","created_at":"2026-05-18T03:41:21Z"},{"alias_kind":"pith_short_12","alias_value":"G7QTJCRFVZAQ","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"G7QTJCRFVZAQ7FHY","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"G7QTJCRF","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:5f5311cd1dbe57d4b000cd7976afa2644751341209bacd39d3e3a566f973ed33","target":"graph","created_at":"2026-05-18T03:41:21Z","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":"A sparsity-driven algorithm of inverse synthetic aperture radar (ISAR) imaging is proposed. Based on the parametric sparse representation of the received ISAR signal, the problem of ISAR image formation is converted into the joint estimation of the target rotation rate and the sparse power distribution in the spatial domain. This goal is achieved by sequential minimization of L0 and L2 norms, which ensure the sparsest ISAR image and the minimum recovery error, respectively.","authors_text":"Gang Li, Wei Rao, Xiang-Gen Xia, Xiqin Wang","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-02-23T08:27:23Z","title":"ISAR Image Formation Using Sequential Minimization of L0 and L2 Norms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5110","kind":"arxiv","version":4},"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":"sha256:2c57be30b34e1335e038006f0f1190b0adc8ae361be2f77bd8a0ccff3133b3ce","target":"record","created_at":"2026-05-18T03:41:21Z","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":"ae26b15e4c28c7949873b65e7f0d73c925b66c3f75e8991ea7748f68c0f4a26a","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2012-02-23T08:27:23Z","title_canon_sha256":"e1559938ba7b53852ff93e149ae59ec6ff2302cad96c18fede2c8ad0a52b76d6"},"schema_version":"1.0","source":{"id":"1202.5110","kind":"arxiv","version":4}},"canonical_sha256":"37e1348a25ae410f94f8f73359bd0200f8a034a5a86ec7599ea5d5a4ad40552b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37e1348a25ae410f94f8f73359bd0200f8a034a5a86ec7599ea5d5a4ad40552b","first_computed_at":"2026-05-18T03:41:21.467408Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:41:21.467408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FOGpFSnEewiLKLKqbODFhSGDfN+Q/cSv73trLN0OPKXs+5nhXegQ+nC6Jh11S+byHAz4mMjAY0BLbRRS7TGODQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:41:21.468008Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.5110","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2c57be30b34e1335e038006f0f1190b0adc8ae361be2f77bd8a0ccff3133b3ce","sha256:5f5311cd1dbe57d4b000cd7976afa2644751341209bacd39d3e3a566f973ed33"],"state_sha256":"21e55f58bbb1e32fbe8b5caf9dae6f6d4634e88b4961f0cd6de6d677a1d482fa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yQWilVnI5cK3AL6u4/2NvXj9jKyQ7W1XnOK09VMNar+Ve+hxsA1GeoqfCSR8k7DkWc3CjccUl+sq63QZx4u6BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T09:26:32.068783Z","bundle_sha256":"1b9580d0a2884a16ca9422b76204f4e26e5f349a05817b554a0f5f6b291fff37"}}