FN Archimer Export Format PT J TI The SARAL/AltiKa mission: A step forward to the future of altimetry BT AF Verron, Jacques Bonnefond, Pascal Andersen, Ole ARDHUIN, Fabrice Bergé-Nguyen, Muriel Bhowmick, Suchandra Blumstein, Denis Boy, François Brodeau, Laurent Crétaux, Jean-François Dabat, Mei Ling Dibarboure, Gérald Fleury, Sara Garnier, Florent Gourdeau, Lionel Marks, Karen Queruel, Nadège Sandwell, David Smith, Walter H.F. Zaron, Ed AS 1:1;2:2;3:3;4:4;5:5;6:6;7:5,7;8:7;9:8;10:5,7;11:5;12:7;13:5;14:5;15:5;16:9;17:8;18:10;19:9;20:11; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:; C1 Institut des Géosciences de l’Environnement, CNRS, CS 40700, 38 058 Grenoble Cedex 9, France Observatoire de Paris, SYRTE, 77 avenue Denfert Rochereau, 75014 Paris, France DTU SPACE, National Space Institute, Technical University of Denmark, Elektrovej, 2800 Kgs. Lyngby, Denmark LOPS, IFREMER, CS 10070, 29280 Plouzané, France LEGOS, 14 Avenue Edouard Belin, 31400 Toulouse, France ISRO, Oceanic Sciences Division, Space Applications Centre, Ambawadi Vistar P.O., Ahmedabad, 380015, India CNES, 18 Avenue Edouard Belin, 31400 Toulouse, France OCEAN NEXT, 90 chemin du Moulin, 38660 La Terrasse, France Laboratory for Satellite Altimetry, NOAA, 5830 University Research Court, College Park, MD 20740, Maryland, USA Scripps Inst. of Oceanography, 8622 Kennel Way, La Jolla, CA 92037, California, USA Department of Civil and Environmental Engineering, Portland State University, P.O. Box 751 Portland, OR 97207-0751, Oregon, USA C2 CNRS, FRANCE OBSERV PARIS, FRANCE UNIV TECH DENMARK, DENMARK CNRS, FRANCE OBSERV MIDI PYRENEES, FRANCE ISRO, INDIA CNES, FRANCE OCEAN NEXT, FRANCE NOAA, USA UNIV CALIF SAN DIEGO, USA UNIV PORTLAND STATE, USA UM LOPS IN WOS Cotutelle UMR copubli-france copubli-europe copubli-int-hors-europe copubli-sud IF 2.611 TC 26 UR https://archimer.ifremer.fr/doc/00607/71878/70573.pdf LA English DT Article DE ;Satellite;Altimetry;Ka-band AB The CNES/ISRO altimetric satellite SARAL/AltiKa was launched in February 2013 and since then has provided useful data for various scientific and operational applications in oceanography, hydrology, cryospheric sciences and geodesy. However, a Reaction Wheel problem forced relaxation of the repeatability constraint on the satellite’s orbit, which has been drifting slowly since July 2016. Beyond the expected contributions of this mission and its very good integration into the objectives of the constellation of altimetric satellites, it has become more and more apparent that specific contributions and innovations related to the main specification of SARAL/AltiKa, that is to say the use of the Ka-band, have clearly emerged. The advantages of the Ka-band are in short the reduction of ionosphere effects, the smaller footprint, the better horizontal resolution and the higher vertical resolution. A drawback of the Ka-band is the attenuation due to water/water vapor in case of rain and the resulting loss of data. The main objective of this paper is to highlight the specific advances of the Ka-band in different scientific and technical fields and to show why they are promising for the future and open the way to several missions or mission projects. Although unplanned initially, the fine coverage of the Drifting Phase brings some interesting openings especially for geodesy and hydrology applications. PY 2021 PD JUN SO Advances In Space Research SN 0273-1177 PU Elsevier BV VL 68 IS 2 UT 000659800000007 BP 808 EP 828 DI 10.1016/j.asr.2020.01.030 ID 71878 ER EF