{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,7,13]],"date-time":"2024-07-13T21:55:49Z","timestamp":1720907749980},"reference-count":24,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,16]],"date-time":"2021-01-16T00:00:00Z","timestamp":1610755200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000844","name":"European Space Agency","doi-asserted-by":"publisher","award":["C18318\/05\/NL","4200022114\/08\/NL\/JA","4000104810\/11\/I-NB","4000111597\/14\/I-AM","4000111474\/14\/I-NB","4000107394\/12\/I-NB","4000116874\/16\/I-NB"],"id":[{"id":"10.13039\/501100000844","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"CryoSat-2 is the first satellite mission carrying a high pulse repetition frequency radar altimeter with interferometric capability on board. Across track interferometry allows the angle to the point of closest approach to be determined by combining echoes received by two antennas and knowledge of their orientation. Accurate information of the platform mispointing angles, in particular of the roll, is crucial to determine the angle of arrival in the across-track direction with sufficient accuracy. As a consequence, different methods were designed in the CryoSat-2 calibration plan in order to estimate interferometer performance along with the mission and to assess the roll\u2019s contribution to the accuracy of the angle of arrival. In this paper, we present the comprehensive approach used in the CryoSat-2 Mission to calibrate the roll mispointing angle, combining analysis from external calibration of both man-made targets, i.e., transponder and natural targets. The roll calibration approach for CryoSat-2 is proven to guarantee that the interferometric measurements are exceeding the expected performance.<\/jats:p>","DOI":"10.3390\/rs13020302","type":"journal-article","created":{"date-parts":[[2021,1,20]],"date-time":"2021-01-20T08:34:25Z","timestamp":1611131665000},"page":"302","source":"Crossref","is-referenced-by-count":2,"title":["Roll Calibration for CryoSat-2: A Comprehensive Approach"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-1440-6373","authenticated-orcid":false,"given":"Albert","family":"Garcia-Mond\u00e9jar","sequence":"first","affiliation":[{"name":"isardSAT S.L., Barcelona Advanced Industry Park, 08042 Barcelona, Spain"}]},{"ORCID":"http:\/\/orcid.org\/0000-0001-6831-7133","authenticated-orcid":false,"given":"Michele","family":"Scagliola","sequence":"additional","affiliation":[{"name":"Aresys SRL, 20132 Milano, Italy"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-3346-9289","authenticated-orcid":false,"given":"Noel","family":"Gourmelen","sequence":"additional","affiliation":[{"name":"School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK"},{"name":"IPGS UMR 7516, Universit\u00e9 de Strasbourg, CNRS, 67000 Strasbourg, France"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-3534-4554","authenticated-orcid":false,"given":"Jerome","family":"Bouffard","sequence":"additional","affiliation":[{"name":"ESA ESRIN, 00044 Frascati, Italy"}]},{"given":"M\u00f2nica","family":"Roca","sequence":"additional","affiliation":[{"name":"isardSAT S.L., Barcelona Advanced Industry Park, 08042 Barcelona, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2305","DOI":"10.1109\/TGRS.2004.834352","article-title":"The mean echo and echo cross product from a beamforming interferometric altimeter and their application to elevation measurement","volume":"42","author":"Wingham","year":"2004","journal-title":"IEEE Trans. Geosci. Rem. Sens."},{"key":"ref_2","unstructured":"ESA Team (2007). CryoSat Mission and Data Description, ESTEC. Available online: http:\/\/esamultimedia.esa.int\/docs\/Cryosat\/Mission_and_Data_Descrip.pdf."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"841","DOI":"10.1016\/j.asr.2005.07.027","article-title":"CryoSat: A mission to determine the fluctuations in Earth\u2019s land and marine ice fields","volume":"37","author":"Wingham","year":"2006","journal-title":"Adv. Space Res."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1109\/TGRS.2012.2200298","article-title":"Calibration of the CryoSat-2 Interferometer and Measurement of Across-Track Ocean Slope","volume":"51","author":"Galin","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1399","DOI":"10.1109\/LGRS.2013.2293960","article-title":"Measuring the Pitch of CryoSat-2 Using the SAR Mode of the SIRAL Altimeter","volume":"11","author":"Galin","year":"2014","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1561","DOI":"10.1109\/LGRS.2015.2413135","article-title":"Pitch Estimation for CryoSat by Analysis of Stacks of Single-Look Echoes","volume":"12","author":"Scagliola","year":"2015","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1889","DOI":"10.5194\/tc-14-1889-2020","article-title":"CryoSat Ice Baseline-D validation and evolutions","volume":"14","author":"Meloni","year":"2020","journal-title":"Cryosphere"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1589","DOI":"10.1016\/j.asr.2018.01.008","article-title":"CryoSat-2 range, datation and interferometer calibration with Svalbard transponder","volume":"62","author":"Fornari","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1516","DOI":"10.1016\/j.asr.2017.09.024","article-title":"The CryoSat interferometer: End-to-end calibration and achievable performance","volume":"62","author":"Scagliola","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"L22501","DOI":"10.1029\/2009GL040416","article-title":"Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry","volume":"36","author":"Hawley","year":"2009","journal-title":"Geophys. Res. Lett."},{"key":"ref_11","first-page":"3133","article-title":"Interferometric swath processing of Cryosat-2 data for glacial ice topography","volume":"7","author":"Gray","year":"2013","journal-title":"Cryosphere Discuss."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1226","DOI":"10.1016\/j.asr.2017.11.014","article-title":"CryoSat-2 swath interferometric altimetry for mapping ice elevation and elevation change","volume":"62","author":"Gourmelen","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"9796","DOI":"10.1002\/2017GL074929","article-title":"Channelized melting drives thinning under a rapidly melting Antarctic ice shelf","volume":"44","author":"Gourmelen","year":"2017","journal-title":"Geophys. Res. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"146","DOI":"10.3389\/feart.2019.00146","article-title":"Measuring height change around the periphery of the Greenland Ice Sheet with radar altimetry","volume":"7","author":"Gray","year":"2019","journal-title":"Front. Earth Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1038\/s41586-019-1855-2","article-title":"Mass balance of the Greenland Ice Sheet from 1992 to 2018","volume":"579","author":"Shepherd","year":"2020","journal-title":"Nature"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1895","DOI":"10.5194\/tc-9-1895-2015","article-title":"CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps","volume":"9","author":"Gray","year":"2015","journal-title":"Cryosphere"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"12138","DOI":"10.1002\/2016GL071485","article-title":"Surface elevation change and mass balance of Icelandic ice caps derived from swath mode CryoSat-2 altimetry. Geophys","volume":"43","author":"Foresta","year":"2016","journal-title":"Res. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"441","DOI":"10.1016\/j.rse.2018.03.041","article-title":"Heterogeneous and rapid ice loss over the Patagonian Ice Fields revealed by CryoSat-2 swath radar altimetry","volume":"211","author":"Foresta","year":"2018","journal-title":"Remote Sens. Environ."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Jakob, L., Gourmelen, N., Ewart, M., and Plummer, S. (2020). Ice loss in High Mountain Asia and the Gulf of Alaska observed by CryoSat-2 swath altimetry between 2010 and 2019. Cryosphere.","DOI":"10.5194\/tc-2020-176"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1041","DOI":"10.5194\/tc-11-1041-2017","article-title":"A revised calibration of the interferometric mode of the CryoSat-2 radar altimeter improves ice height and height change measurements in western Greenland","volume":"11","author":"Gray","year":"2017","journal-title":"Cryosphere"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Studinger, M., Koenig, L., Martin, S., and Sonntag, J. (2010). Operation icebridge: Using instrumented aircraft to bridge the observational gap between Icesat and Icesat-2. IEEE Inter. Geosci. Remote Sens. Symp.","DOI":"10.1109\/IGARSS.2010.5650555"},{"key":"ref_22","unstructured":"Morin, P., Porter, C., Cloutier, M., Howat, I., Noh, M.J., Willis, M., Bates, B., Williamson, C., and Peterman, K. (2016, January 17\u201322). ArcticDEM; A publically available, high resolution elevation model of the Arctic. Proceedings of the EGUGA 2016, Vienna, Austria. EPSC2016-8396."},{"key":"ref_23","unstructured":"Haran, T., Bohlander, J., Scambos, T., and Fahnestock, M. (2013). Modis Mosaic of Greenland (Mog) Image Map, NSIDC\u2014National Snow and Ice Data Center."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1509","DOI":"10.5194\/tc-8-1509-2014","article-title":"The Greenland Ice Mapping Project (GIMP) land classification and surface elevation data sets","volume":"8","author":"Howat","year":"2014","journal-title":"Cryosphere"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/2\/302\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,7,7]],"date-time":"2024-07-07T09:31:05Z","timestamp":1720344665000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/2\/302"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,1,16]]},"references-count":24,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2021,1]]}},"alternative-id":["rs13020302"],"URL":"https:\/\/doi.org\/10.3390\/rs13020302","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,1,16]]}}}