{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:6JIJHHUMS537CZSFQJKRXTRKOF","short_pith_number":"pith:6JIJHHUM","schema_version":"1.0","canonical_sha256":"f250939e8c9777f1664582551bce2a7167d3a37eb0ceba47c2207e62308cf995","source":{"kind":"arxiv","id":"physics/0406025","version":1},"attestation_state":"computed","paper":{"title":"The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft","license":"","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.ao-ph","authors_text":"F. Soulat, G. Ruffini, M. Caparrini, M. Martin-Neira (ESA/ESTEC), O. Germain (Starlab)","submitted_at":"2004-06-07T13:29:59Z","abstract_excerpt":"During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy. Wind speed (U10) was around 10 m/s, and SWH up to 2 m. A geophysical parametric waveform model was used for retracking and estimation of the lapse between the direct and reflected signals with a 1-second precision of 3 m. The lapse was used to estimate the SSH along the track using a differential model. The RMS error of the 20 km averaged GNSS-R absolute altimetric solution with respect to Jas"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"physics/0406025","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"physics.ao-ph","submitted_at":"2004-06-07T13:29:59Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"d1dfbdf6c3358f8f164bfa161894794ba83257217a3f94029de127df30ac47fe","abstract_canon_sha256":"0b9d14cf5708c02a40633f28abcb3ecdc4b6a6eaaedb67d285e7d8b3c95450c9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:38:08.413493Z","signature_b64":"w4CW6kj0ZGVsDFF5RR/ugKd5wZpxXxW22CvFGTRcXthf7+q6FbE7nQxzcveHozlTtUHGmKdHMRQTimqOKy2hCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f250939e8c9777f1664582551bce2a7167d3a37eb0ceba47c2207e62308cf995","last_reissued_at":"2026-05-18T01:38:08.412917Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:38:08.412917Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft","license":"","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.ao-ph","authors_text":"F. Soulat, G. Ruffini, M. Caparrini, M. Martin-Neira (ESA/ESTEC), O. Germain (Starlab)","submitted_at":"2004-06-07T13:29:59Z","abstract_excerpt":"During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy. Wind speed (U10) was around 10 m/s, and SWH up to 2 m. A geophysical parametric waveform model was used for retracking and estimation of the lapse between the direct and reflected signals with a 1-second precision of 3 m. The lapse was used to estimate the SSH along the track using a differential model. The RMS error of the 20 km averaged GNSS-R absolute altimetric solution with respect to Jas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0406025","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"physics/0406025","created_at":"2026-05-18T01:38:08.413005+00:00"},{"alias_kind":"arxiv_version","alias_value":"physics/0406025v1","created_at":"2026-05-18T01:38:08.413005+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0406025","created_at":"2026-05-18T01:38:08.413005+00:00"},{"alias_kind":"pith_short_12","alias_value":"6JIJHHUMS537","created_at":"2026-05-18T12:25:52.051335+00:00"},{"alias_kind":"pith_short_16","alias_value":"6JIJHHUMS537CZSF","created_at":"2026-05-18T12:25:52.051335+00:00"},{"alias_kind":"pith_short_8","alias_value":"6JIJHHUM","created_at":"2026-05-18T12:25:52.051335+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF","json":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF.json","graph_json":"https://pith.science/api/pith-number/6JIJHHUMS537CZSFQJKRXTRKOF/graph.json","events_json":"https://pith.science/api/pith-number/6JIJHHUMS537CZSFQJKRXTRKOF/events.json","paper":"https://pith.science/paper/6JIJHHUM"},"agent_actions":{"view_html":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF","download_json":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF.json","view_paper":"https://pith.science/paper/6JIJHHUM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=physics/0406025&json=true","fetch_graph":"https://pith.science/api/pith-number/6JIJHHUMS537CZSFQJKRXTRKOF/graph.json","fetch_events":"https://pith.science/api/pith-number/6JIJHHUMS537CZSFQJKRXTRKOF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF/action/storage_attestation","attest_author":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF/action/author_attestation","sign_citation":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF/action/citation_signature","submit_replication":"https://pith.science/pith/6JIJHHUMS537CZSFQJKRXTRKOF/action/replication_record"}},"created_at":"2026-05-18T01:38:08.413005+00:00","updated_at":"2026-05-18T01:38:08.413005+00:00"}