Development and Performance Analysis of a Fully Functional Return Signal Simulator for HY-2B Scatterometer

Wang, Caiyun; Guo, Wei; Yang, Shuangbao; Liu, Peng

doi:10.1109/igarss.2018.8517885

Cited by 1 publication

(2 citation statements)

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“…Based on the signal-rebuilt transponder for HY-2A and the RSS [10], [11], some improvements were done in the new built transponder, including digital Intermediate frequency (IF), Direct Digital Synthesis (DDS), time-division frequency modulation, self-calibration, etc.…”

Section: A Improvements Over the Previous Transpondermentioning

confidence: 99%

“…In order to have a thorough test and comprehensive verification prior to its launch, a fully functional return signal simulator (RSS) was developed in our lab [10], [11]. It can provide flexible echo forms, precise time delay, and better Signal to Noise Ratio (SNR), being an ideal simulator for the altimeter function test before its launch.…”

Section: Introductionmentioning

confidence: 99%

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In-Orbit Calibration and Validation of HY-2B Altimeter Using an Improved Transponder

Wang

Lin

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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HY-2B (Haiyang) is the follow-on mission to HY-2A, the Chinese first sea satellite for oceanography, launched in Oct 2018. The main payloads onboard are similar to HY-2A. For the altimeter, an in-orbit calibration mode was designed to achieve higher calibration precision. An improved transponder was built and deployed for the calibration campaign. The purpose of the paper is to describe the in-orbit calibration and validation of HY-2B altimeter based on an improved transponder. A signal-rebuilt transponder was developed and employed in HY-2A altimeter calibration. It played an important role in quantitative analysis of HY-2A altimeter data products. For HY-2B altimeter, a newly-designed calibration mode was added, and an improved transponder was built. It has some advantages over the previous one in the rebuilt signal forms and modulation ways. Two calibration campaigns were carried out, in April 2019 and October 2020 at different sites. In the two campaigns, the precision of the altimeter range calibration is obtained less than 1 cm. For further validation and assessment to the result, a comparison between HY-2B and Jason-3 was performed in term of SSH (Sea Surface Height) on the tens of cross track points in the open ocean. The comparison result shows high degree of accuracy and stability of HY-2B altimeter instrument. In China's next five-year plan (2021-2025), many more transponders and related calibration facilities would be installed in the ocean calibration fields, serving a variety of different satellite altimetry missions.

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Section: A Improvements Over the Previous Transpondermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%