{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:KJMSH4M335Z7LTBBDT2YHVJLZT","short_pith_number":"pith:KJMSH4M3","canonical_record":{"source":{"id":"2506.08620","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-06-10T09:28:51Z","cross_cats_sorted":[],"title_canon_sha256":"0522fe5480bad66efc391f6d1d65b8ba39abd433966a493bc5ad1dcecee062e4","abstract_canon_sha256":"ad48bb94ad40807e1a24996cc8d2fedc13512a8058990809b8653ec25833fa62"},"schema_version":"1.0"},"canonical_sha256":"525923f19bdf73f5cc211cf583d52bccdfd8aecebf2e3699f2d6a6429016d286","source":{"kind":"arxiv","id":"2506.08620","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.08620","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"arxiv_version","alias_value":"2506.08620v1","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.08620","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_12","alias_value":"KJMSH4M335Z7","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_16","alias_value":"KJMSH4M335Z7LTBB","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_8","alias_value":"KJMSH4M3","created_at":"2026-07-05T11:19:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:KJMSH4M335Z7LTBBDT2YHVJLZT","target":"record","payload":{"canonical_record":{"source":{"id":"2506.08620","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-06-10T09:28:51Z","cross_cats_sorted":[],"title_canon_sha256":"0522fe5480bad66efc391f6d1d65b8ba39abd433966a493bc5ad1dcecee062e4","abstract_canon_sha256":"ad48bb94ad40807e1a24996cc8d2fedc13512a8058990809b8653ec25833fa62"},"schema_version":"1.0"},"canonical_sha256":"525923f19bdf73f5cc211cf583d52bccdfd8aecebf2e3699f2d6a6429016d286","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:19:10.693441Z","signature_b64":"idHzEPnQY/Ojo/tN9RT6yLUFx16rGsqvSjh/TlCwcwhJOLhLyFi0BwO214a0LFHvIiZ66RN8tsNBfHdBzDDrAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"525923f19bdf73f5cc211cf583d52bccdfd8aecebf2e3699f2d6a6429016d286","last_reissued_at":"2026-07-05T11:19:10.692999Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:19:10.692999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.08620","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":"2026-07-05T11:19:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"knaKLIi4BcoWAPjISYgVnV4B9GNdODYPUUYaT/kz9ZlrxvgbRsHoSTdHvQ7ack+aPL4UImozU/FCvd6hAoPhAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T20:10:36.079097Z"},"content_sha256":"5a042bcad18cf6e05ad54f59399be17698e3501969d5769b05f738ec328176fb","schema_version":"1.0","event_id":"sha256:5a042bcad18cf6e05ad54f59399be17698e3501969d5769b05f738ec328176fb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:KJMSH4M335Z7LTBBDT2YHVJLZT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extended Spherical Geometry Algorithm for Spaceborne SAR Processing in Stripmap and TOPS Imaging Modes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Jixia Fan, Manyi Tao, Xinhua Mao","submitted_at":"2025-06-10T09:28:51Z","abstract_excerpt":"The Spherical Geometry Algorithm (SGA) demonstrates superior capability in achieving efficient and precise spaceborne SAR image formation processing, even under challenging imaging conditions including non-linear radar trajectories and spherical Earth surface geometry. Nevertheless, the original SGA is specifically developed for spotlight SAR data processing and can't directly applied to processing spaceborne SAR data in other modes. In this paper, we first analyze the limitations of the SGA algorithm when applied to stripmap or TOPS mode SAR processing, and then propose an improved SGA algori"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.08620","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/2506.08620/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":"2026-07-05T11:19:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Isy6s0q1VbkjT2A7WRLiHYjzjY5fWRH6DZufmjbeSQsYRgmDmZFSoiONmyraa6UnnHaKMqDJYR0ztveC9tWXBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T20:10:36.079877Z"},"content_sha256":"44a00f48a7260118378dfdc77658a0336c2d0821e2765b92178c069610514ffb","schema_version":"1.0","event_id":"sha256:44a00f48a7260118378dfdc77658a0336c2d0821e2765b92178c069610514ffb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/bundle.json","state_url":"https://pith.science/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/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":"2026-08-09T20:10:36Z","links":{"resolver":"https://pith.science/pith/KJMSH4M335Z7LTBBDT2YHVJLZT","bundle":"https://pith.science/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/bundle.json","state":"https://pith.science/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KJMSH4M335Z7LTBBDT2YHVJLZT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:KJMSH4M335Z7LTBBDT2YHVJLZT","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":"ad48bb94ad40807e1a24996cc8d2fedc13512a8058990809b8653ec25833fa62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-06-10T09:28:51Z","title_canon_sha256":"0522fe5480bad66efc391f6d1d65b8ba39abd433966a493bc5ad1dcecee062e4"},"schema_version":"1.0","source":{"id":"2506.08620","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.08620","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"arxiv_version","alias_value":"2506.08620v1","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.08620","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_12","alias_value":"KJMSH4M335Z7","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_16","alias_value":"KJMSH4M335Z7LTBB","created_at":"2026-07-05T11:19:10Z"},{"alias_kind":"pith_short_8","alias_value":"KJMSH4M3","created_at":"2026-07-05T11:19:10Z"}],"graph_snapshots":[{"event_id":"sha256:44a00f48a7260118378dfdc77658a0336c2d0821e2765b92178c069610514ffb","target":"graph","created_at":"2026-07-05T11:19:10Z","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/2506.08620/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Spherical Geometry Algorithm (SGA) demonstrates superior capability in achieving efficient and precise spaceborne SAR image formation processing, even under challenging imaging conditions including non-linear radar trajectories and spherical Earth surface geometry. Nevertheless, the original SGA is specifically developed for spotlight SAR data processing and can't directly applied to processing spaceborne SAR data in other modes. In this paper, we first analyze the limitations of the SGA algorithm when applied to stripmap or TOPS mode SAR processing, and then propose an improved SGA algori","authors_text":"Jixia Fan, Manyi Tao, Xinhua Mao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-06-10T09:28:51Z","title":"Extended Spherical Geometry Algorithm for Spaceborne SAR Processing in Stripmap and TOPS Imaging Modes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.08620","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":"sha256:5a042bcad18cf6e05ad54f59399be17698e3501969d5769b05f738ec328176fb","target":"record","created_at":"2026-07-05T11:19:10Z","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":"ad48bb94ad40807e1a24996cc8d2fedc13512a8058990809b8653ec25833fa62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2025-06-10T09:28:51Z","title_canon_sha256":"0522fe5480bad66efc391f6d1d65b8ba39abd433966a493bc5ad1dcecee062e4"},"schema_version":"1.0","source":{"id":"2506.08620","kind":"arxiv","version":1}},"canonical_sha256":"525923f19bdf73f5cc211cf583d52bccdfd8aecebf2e3699f2d6a6429016d286","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"525923f19bdf73f5cc211cf583d52bccdfd8aecebf2e3699f2d6a6429016d286","first_computed_at":"2026-07-05T11:19:10.692999Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:19:10.692999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"idHzEPnQY/Ojo/tN9RT6yLUFx16rGsqvSjh/TlCwcwhJOLhLyFi0BwO214a0LFHvIiZ66RN8tsNBfHdBzDDrAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:19:10.693441Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.08620","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5a042bcad18cf6e05ad54f59399be17698e3501969d5769b05f738ec328176fb","sha256:44a00f48a7260118378dfdc77658a0336c2d0821e2765b92178c069610514ffb"],"state_sha256":"33b4185a0c716d54f3e59da14d912cd25f11afe4fd47ba22b7e52f22715281c0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p+xNmnvykjQNcLwBQjOcXDj5vE9SeA5Qb3ZJW7ILQQJHT+3idj9Cw9NXKE8u2doAyJXKwpfQfzEc8gTt3Up2Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T20:10:36.085220Z","bundle_sha256":"c2a1ddb9d537922b2e03e54a5c34c3d39aeeef0b64d64bcca105452703008936"}}