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本文以同期观测的Jason-2地球物理数据GDR为参考,对海洋二号(HY-2A)雷达高度计临时地球物理数据IGDR的主要测高参数与交叉点测高不符值做了评价分析,对研究发现的HY-2A测高数据质量问题给出了总结和改进建议.研究发现HY-2A存在明显的整轨迹数据丢失现象,且数据编辑比例偏高,导致测高数据的可用性相对较差.HY-2A与Jason-2的有效波高差异均值为-3.8 cm±7.1 cm,具有较高观测精度.但研究发现HY-2A后向散射系数存在异常跳变与漂移现象,电离层延迟的模型改正值与双频观测改正值的相关性为0.095,可靠性较差.HY-2A海面高异常与Jason-2比较存在速率约-60.9 cm/y的漂移,与星上超稳振荡漂移有关.交叉点分析表明HY-2A交叉点海面高不符值的标准差为6.52 cm,与Jason-2精度偏差在1 cm左右,满足海洋科学研究和应用的要求.
In this paper, based on the Jason-2 geophysical data GDR observed in the same period, this paper evaluates and analyzes the discrepancy between the main altimeter and inter-point altimetry data of the temporary geophysical data IGDR for the HY-2A radar altimeter, The conclusion of HY-2A altimetry data quality and the suggestions for improvement are given.It is found that HY-2A has a significant loss of whole-trajectory data and a high proportion of data editing, resulting in relatively poor availability of altimeter data.HY -2A and Jason-2 were -3.8 cm ± 7.1 cm, but the study found that the backscattering coefficient of HY-2A had anomalous jump and drift, and the model correction value of ionospheric delay Correlation with the correction of the dual-frequency observations is 0.095, which is less reliable. The HY-2A sea surface anomaly has a drift of about -60.9 cm / y compared with that of Jason-2, which is related to the super-stable oscillation drift on the satellite. The analysis shows that the standard deviation of the sea surface height discrepancy at the HY-2A intersection is 6.52 cm, which is about 1 cm away from the Jason-2 precision, which meets the requirements of marine scientific research and application.