利用南海石油平台的卫星雷达高度计定标与检验

在对南海石油平台所处的南海北部海域海底地形、平均海平面、风浪时空分布等进行分析基础上,利用南海石油平台水位计对Jason-2卫星高度计进行了测高绝对定标,定标结果为30.9 cm±7.8 cm,分析发现南海北部中尺度涡可能对定标结果产生影响;利用南海石油平台测波雷达对Jason-1高度计有效波高进行了精度检验,Jason-1高度计Ku波段和C波段有效波高测量的均方根误差分别为0.43 m和0.45 m。分析和检验结果表明,南海石油平台所处海洋环境条件、平台上装载的水位计和测波雷达均满足卫星雷达高度计定标与检验要求。南海石油平台定标场预期可用于中国海洋二号卫星和其他卫星高度计的定标与检验。

Calibration and validation of satellite radar altimeters in the South China Sea using an oil platform

We analyzed the distributing characteristics of bathymetric data, mean sea surface height, wind, and waves. We then performed an absolute calibration of a Jason-2 satellite altimeter by using in-situ sea level measurements gathered by a sea level sensor with a bias of 30.0 cm ± 7.8 cm. The analysis showed that calibration results can be affected by the mesoscale vortexes in the northern South China Sea. We also validated significant wave heights against in-situ data gathered by a wave radar. The root mean square error of the significant wave heights extracted from Ku and C microwave band measurements of Jason-1 were 0.43 m and 0.45 m, respectively. The analysis and validation results indicate that the marine environment where the oil platform was located, the sea lever sensor, and the wave radar onboard the oil platform all fitted with the standard calibration/validation for a satellite radar altimeter. The oil platform calibration site in the South China Sea is expected to be used for calibration and validation of altimeters onboard the Chinese Haiyang-2 satellite and other satellites.