HY-2B卫星雷达高度计对流层路径延迟精度分析

The Tropospheric Path Delay Accuracy Analysis of HY-2B Satellite Radar Altimeter

干对流层路径延迟与湿对流层路径延迟是影响HY-2B测高精度的重要因素。本文采用星星交叉分析法和对流层独立模型检验法对HY-2B干对流层与湿对流层路径延迟产品进行对比分析。本文基于大气压强数据和辐射计测量的水汽数据,利用干对流层和湿对流层独立检验模型对HY-2B沿轨数据进行重处理,与HY-2B业务化运行产品差异的标准差分别为1.8和2.6 mm。此外,HY-2B与Jason-3交叉点处干对流层与湿对流层路径延迟差异的标准差分别为1.5和6.1 mm,两年内产品的漂移较少。实验结果表明:HY-2B干对流层与湿对流层路径延迟的精度均达到国际水平。该文对于验证国产海洋卫星HY-2B数据精度,扩展HY-2B卫星数据的应用范围具有重要意义。

Dry tropospheric path delay and wet tropospheric path delay are important factors affecting the height measurement accuracy of HY-2B.In this paper,the satellite cross analysis method and tropospheric independent model validation method are used to compare and analyze the dry troposphere and wet troposphere path delay products of HY-2B.Based on the atmospheric pressure data and water vapor data measured by radiometer,this paper reprocesses the HY-2B along-track data by using the dry troposphere and wet troposphere independent validation model,The standard deviations of the differences between reprocessing results and HY-2B operational products are 1.8 and 2.6 mm respectively.In addition,the standard deviation of dry troposphere and wet troposphere path delay difference between at the cross points of HY-2B and Jason-3 is 1.5 and 6.1 mm respectively.The product drift is less in two years.The experimental results show that the accuracy of HY-2B dry troposphere and wet troposphere path delay reaches the international level.This paper is of great significance for verifying the data accuracy of domestic marine satellite HY-2B and expanding the application range of HY-2B satellite data.