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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2026, V. 23, No. 5, pp. 9-21

Method for calculating the SWOT intermission bias relative to Jason-CS for the Sea of Okhotsk

A.A. Romanov , A.A. Romanov 1 
1 Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia
Accepted: 24.06.2026
DOI: 10.21046/2070-7401-2026-23-5-9-21
Over their period of continuous operation, the TOPEX/Poseidon (Topographic Experiment/Poseidon) altimetry mission and its successors, Jason-1/2/3/CS, have accumulated a significant volume of altimetry data for the global ocean. The recent launch of the new SWOT (Surface Water and Ocean Topography) spacecraft has expanded the capabilities for studying mesoscale variability; however, practical application of SWOT nadir altimeter data in conjunction with Jason-CS data for regional basins, such as the Sea of Okhotsk, is challenging without eliminating the local intermission bias. Within the framework of this study, an analysis was performed using a dataset from the SWOT traditional altimeter and the corresponding Jason-CS sample for the 2023–2026 period. A methodology is proposed to eliminate the local intermission bias based on reference data from the Jason-CS satellite. An adaptive algorithm utilizing Tikhonov regularization implements a bias calculation that is robust against data deficits. As a result of applying the proposed methodology, the systematic bias between the data samples decreased from +2.26 to +0.71 cm, and the root-mean-square error at crossover points was reduced by 43.9 %.
Keywords: satellite altimetry, Sea of Okhotsk, regional intermission bias elimination methodology, SWOT, Jason-CS
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