基于比例法和回归分析的高度计湿对流层延迟改正方法

A Method of Altimeter Wet Tropospheric Delay Correction Based on Proportion Method and Regression Analysis

卫星高度计资料已被广泛地应用于大地测量学、地球物理学和海洋学等方面的研究。但在近岸地区,卫星足迹内同时包含海域和陆地,此时观测到的亮温数据受到陆地辐射信号的污染,使得湿对流层延迟改正方法不再适用。本文提出了基于比例法的二元线性回归方法校正亮温数据,然后计算湿对流层延迟改正值的新方法。通过与探空站计算的参考值比较,发现本文提出的新方法比未经校正的亮温值计算出的湿对流层延迟改正量,其精度提高了约0.5cm,而与比例法比较,其精度也提高了约0.2cm。

The satellite altimeter data have been widely used in geodesy,geophysics and oceanography and so on.But the wet troposphere delay correction method is no longer applicable in the near shore area due to the brightness temperature data having been contaminated when the satellite footprint also containing both sea and land is considered.A new method based on proportional method of two linear regression to correct the brightness temperature data is proposed in this paper,and then the correction value of the wet troposphere delay is calculated.The accuracy of new method proposed in this paper than those unjusted wet tropospheric delay correction improves about 0.5cm and 0.2cm than proportion method through the camparison of the reference value of radiosonde station.