{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T18:19:18Z","timestamp":1770747558426,"version":"3.49.0"},"reference-count":29,"publisher":"Optica Publishing Group","issue":"16","license":[{"start":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T00:00:00Z","timestamp":1753920000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T00:00:00Z","timestamp":1753920000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2023YFB3905303"],"award-info":[{"award-number":["2023YFB3905303"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2025,8,11]]},"abstract":"<jats:p>To address BRDF (bidirectional reflectance distribution function) degradation of the HY-1C satellite's calibration solar diffuser (CSD) due to long-term space radiation, which compromises the radiometric calibration accuracy of the satellite calibration spectrometer (SCS), a reference solar diffuser (RSD) is used to monitor CSD's BRDF degradation. The study derives an SCS radiometric calibration model based on CSD and combines it with the relationship between on-board calibration-time BRDF and laboratory measurements to obtain the BRDF degradation factor's original expression. A dual-reference band-ratio time-series model is developed by coupling BRDF degradation with wavelength and on-orbit cumulative exposure time, normalizing against the degradation-insensitive 900 nm BRDF of SCS Band 118 and the first on-board calibration BRDF. This model mitigates errors from observation angular variations, Solar attenuation screen (SAS) transmittance, spectral response mismatches, and data fluctuations. Analysis of nearly five years of in-orbit data shows BRDF degradation strongly depends on wavelength, with shorter wavelengths degrading more severely: UV1 (355 nm) and UV2 (385 nm) exhibit a degradation factor of 0.945, exceeding Band 18 (399.5 nm, 1.000\u21920.967, 3.3%) and Band 30 (459.5 nm, 1.0000\u21920.986, 1.4%), while longer wavelengths like Band 100 (810.5 nm) remain stable. Cross-validation using TERRA MODIS shows enhanced consistency: the determination coefficient (R<jats:sup>2<\/jats:sup>) between SCS-corrected and MODIS Band 1 reflectance reaches 0.9945, with absolute reflectance deviation in visible near-infrared channels decreasing by up to 52.69%, and 95% confidence intervals narrowing. This study provides a high-precision BRDF degradation monitoring and correction model for long-term in-orbit radiation calibration, meeting high-precision cross-calibration requirements for the same and cross-platform remote sensors.<\/jats:p>","DOI":"10.1364\/oe.562419","type":"journal-article","created":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T08:59:59Z","timestamp":1751619599000},"page":"33565","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Research on the monitoring method of BRDF degradation for the solar diffuser on HY-1C"],"prefix":"10.1364","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0336-7321","authenticated-orcid":true,"given":"Xu","family":"He Yu","sequence":"first","affiliation":[{"name":"Ningbo University of Technology"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huang","family":"Wen Xin","sequence":"additional","affiliation":[{"name":"Hefei Institutes of Physical Science, Chinese Academy of Sciences"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7479-4577","authenticated-orcid":true,"given":"Qing Jun","family":"Song","sequence":"additional","affiliation":[{"name":"Ministry of Natural Resources of the People\u2019s Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li Ming","family":"Zhang","sequence":"additional","affiliation":[{"name":"Hefei Institutes of Physical Science, Chinese Academy of Sciences"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yue","family":"Ma","sequence":"additional","affiliation":[{"name":"Beijing Institute of Space Mechanics & Electricity"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5677-4764","authenticated-orcid":true,"given":"Cheng","family":"Pei Hong","sequence":"additional","affiliation":[{"name":"Ningbo University of Technology"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"285","published-online":{"date-parts":[[2025,7,31]]},"reference":[{"key":"oe-33-16-33565-R1","first-page":"24","volume":"28","author":"Zhang","year":"2019","journal-title":"Spacecr. 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