The improved design for HY-2B radar altimeter

Xu, Ke; Liu, Peng; Tang, Yueying; Yu, Xiaowei

doi:10.1109/igarss.2017.8127008

Cited by 11 publications

(6 citation statements)

References 5 publications

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“…The Haiyang‐2B (HY‐2B) satellite was launched in China in October 25, 2018. Envisioned for dynamic marine environment observations, HY‐2B is the second ocean satellite from China after the successful HY‐2A, established in orbit around the Earth in 2011 (Xu et al., 2017). Satellites HY‐2C and HY‐2D, scheduled for launch in the near future, will join HY‐2A and HY‐2B to form a comprehensive ocean observation network.…”

Section: Introductionmentioning

confidence: 99%

Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations

Лиу

et al. 2021

JGR Oceans

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Ocean waves are disturbances in the ocean that transmit energy from one place to another. It is an important parameter in the dynamic marine environment. Wave measurements over the oceans are of great significance in modeling and forecasting of weather, ocean surface conditions, ocean circulation, etc. (Zhang et al., 2015). These measurements can be used to improve the understanding of the physical processes responsible for wind-wave evolution, to validate and calibrate models for waves and other ocean processes, and to investigate local and regional wave climate, all of which have the potential to assist in shipping and offshore engineering projects (Durrant et al., 2009). Widely recognized as they are, these measurements were not obtained from space until around 3 decades ago. After the emergence of the satellite altimeter, global monitoring of ocean waves became a reality, with the publication of the first global atlas of significant wave height (SWH) data derived from GEO-3 altimeter data. Since then, SWH data from many different satellites have become available,

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Section: Introductionmentioning

confidence: 99%

Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations

Лиу

et al. 2021

JGR Oceans

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“…HY-2B orbit height is 970 kilometers. Its beam width is 1.1° [1], so the overhead time is about 2 -3 seconds. After passing over, the antenna, the GPS as well as the battery etc., are collected and put in the truck.…”

Section: Procedures Of In-orbit Calibrationmentioning

confidence: 99%

“…The method to estimate HY-2B altimeter clock drift is similar to HY-2A [6], [7]. In HY-2B, a rubidium atomic clock is used [1]. It is rather stable, with very small long-term drift.…”

Section: Calibration Data Processing and Key Techniquesmentioning

confidence: 99%

“…Y-2B is the second China"s satellite for oceanic dynamic, launched in Oct, 2018. The main payloads on HY-2B, similar to HY-2A, include a dual-frequency radar altimeter, a three-band nadir-looking radiometer for atmospheric correction, and a Ku-band radar scatterometer [1].…”

Section: Introductionmentioning

confidence: 99%

“…Some evaluations show the precision of SSH (Sea Surface Height) is more than 4 cm [2]- [4]. In HY-2B, a rubidium atomic clock is firstly used as the frequency reference to synchronize the USO (Ultra Stable Oscillator), therefore, the design accuracy of SSH for HY-2B is improved to 2 cm [1].…”

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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Classification of ice and water in the Arctic using radar altimeter and microwave radiometer data from HY-2B satellite

et al. 2023

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The improved design for HY-2B radar altimeter

Cited by 11 publications

References 5 publications

Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations

Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations

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

Classification of ice and water in the Arctic using radar altimeter and microwave radiometer data from HY-2B satellite

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