Comparison of CYGNSS and Jason-3 Wind Speed Measurements via Gaussian Processes

Comparison of CYGNSS and Jason-3 Wind Speed Measurements via Gaussian Processes
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通过高斯过程进行 CYGNSS 和 Jason-3 风速测量的比较

DOI:
10.1080/26941899.2023.2194349
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发表时间:
2023
期刊:
Data Science in Science
影响因子:
--
通讯作者:
Guinness, Joseph
Guinness, Joseph
中科院分区:
--
文献类型:
--
作者:
Bekerman, William;Guinness, Joseph

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风是地球系统的重要组成部分,对日常生活有着不容置疑的影响。CYGNSS卫星任务通过使用反射GNSS信号推断地面风速的8颗微型卫星来提高海洋风的观测覆盖范围。我们使用高斯过程模型,利用2019年9月至2020年9月期间CYGNSS和Jason-3之间的比较,分析了8颗CYGNSS卫星之间和天线之间风速测量的变化特征。CYGNSS传感器相对于Jason-3表现出一系列偏差,主要在- 1.0 m/s和+0.2 m/s之间,这表明一些CYGNSS传感器相对于彼此和Jason-3有偏差。CYGNSS卫星右舷和左舷天线之间的偏差较小。我们的结果与传统的配对比较分析一致,但比传统的配对比较分析更尖锐。我们还探讨了偏差取决于风速的可能性,发现一些证据表明CYGNSS卫星在低风速下相对于Jason-3具有正偏差。然而,我们认为在估计风速相关偏差时存在一些微妙的问题,因此需要额外仔细的统计建模和分析。
Wind is a critical component of the Earth system and has unmistakable impacts on everyday life. The CYGNSS satellite mission improves observational coverage of ocean windsviaa fleet of eight micro-satellites that use reflected GNSS signals to infer surface wind speed. We present analyses characterizing variability in wind speed measurements among the eight CYGNSS satellites and between antennas, using a Gaussian process model that leverages comparisons between CYGNSS and Jason-3 during a one-year period from September 2019 to September 2020. The CYGNSS sensors exhibit a range of biases, mostly between −1.0 m/s and +0.2 m/s with respect to Jason-3, indicating that some CYGNSS sensors are biased with respect to one another and with respect to Jason-3. The biases between the starboard and port antennas within a CYGNSS satellite are smaller. Our results are consistent with, yet sharper than, a more traditional paired comparison analysis. We also explore the possibility that the bias depends on wind speed, finding some evidence that CYGNSS satellites have positive biases with respect to Jason-3 at low wind speeds. However, we argue that there are subtle issues associated with estimating wind speed-dependent biases, so additional careful statistical modeling and analysis is warranted.
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