Abstract's details

Absolute Calibration of the Chinese HY-2B Altimetric Mission with Fiducial Reference Measurement Standards

Stelios Mertikas (Technical University of Crete, Greece)


Mingsen Lin (National Satellite Ocean Application Service, China); Dimitrios Piretzidis (Space Geomatica, Greece); Costas Kokolakis (Technical University of Crete, Greece); Craig Donlon (European Space Agency, ESTEC, Netherlands); Chaofei Ma (National Satellite Ocean Application Service, China); Yufei Zhang (National Satellite Ocean Application Service, China); Yongjun Jia (National Satellite Ocean Application Service, China); Bo Mu (National Satellite Ocean Application Service, China); Xenophon Frantzis (Technical University of Crete, Greece); Achilles Tripolitsiotis (Space Geomatica, Greece); Lei Yang (First Institute of Oceanography, China)

Event: 2023 Ocean Surface Topography Science Team Meeting

Session: Regional and Global CAL/VAL for Assembling a Climate Data Record

Presentation type: Type Poster

Contribution: PDF file


This research and collaboration work aims at the calibration and validation (Cal/Val) of
the Chinese HY-2B satellite altimeter based upon two permanent Cal/Val facilities: (1) the China
Altimetry Calibration Cooperation Plan in Qingdao, Bohai Sea and the Wanshan islands, China and
(2) the Permanent Facility for Altimetry Calibration established by the European Space Agency in
Crete, Greece. The HY-2B satellite altimeter and its radiometer have been calibrated and monitored
using uniform, standardized procedures, protocols and best practices and also built upon trusted and
indisputable reference standards at both Cal/Val infrastructures in Europe and China. The HY-2B
altimeter is thus monitored in a coordinated, absolute, homogeneous, long-term and worldwide
manner. Calibration of altimeters is accomplished by examining satellite observations in open seas
against reference measurements. Comparisons are established through precise satellite positioning,
water level observations, GPS buoys and reference models (geoid, mean dynamic topography,
earth tides, troposphere and ionosphere) all defined at the Cal/Val sites. In this work, the final
uncertainty for altimeter bias will be attributed to several individual sources of uncertainty, coming
from observations in water level, atmosphere, absolute positioning, reference surface models, transfer
of heights from Cal/Val sites to satellite observations, etc. Through this project, the procedures,
protocols and best practices, originally developed in the course of the ESA FRM4ALT project are
updated, upgraded and followed at both Cal/Val facilities in Europe and China. All in all, the HY-2B
satellite altimeter observes sea level quite well and within its specifications.

Poster show times:

Room Start Date End Date
Esperanza Beach Room (Lobby) Wed, Nov 08 2023,16:15 Wed, Nov 08 2023,18:00
Esperanza Beach Room (Lobby) Thu, Nov 09 2023,14:00 Thu, Nov 09 2023,15:45
Stelios Mertikas
Technical University of Crete