对流层延迟是引起高度计高程测量误差的重要来源,三维成像微波高度计(InIRA)相对于传统剖面高度计有着更大的天线视角范围,不能直接沿用其对流层延迟估计方法。文中以Sentinel-3A数据为基准,对常用的垂向对流层延迟估计模型进行对比筛选,并将筛选出来的模型进行适用于InIRA的改进,并结合第三方气象数据计算出改进后的模型结果并分析天线视角对干、湿对流层延迟估计值的影响。结果表明:干对流层延迟估计值受天线视角的影响较为明显,湿对流层延迟估计值受天线视角的影响较小。

Tropospheric delay is an important source of altimeter elevation measurement error. Compared to traditional profile altimeters, interferometric imaging radar altimeter (InIRA) has a larger range of antenna viewing angle, and it cannot directly follow its tropospheric delay estimation method. Based on the data of Sentinel-3A, several commonly used vertical tropospheric delay estimation models are compared and screened, and the screened models are improved for InIRA. Combined with the third-party meteorological data to calculate the improved model results and analyze the influence of antenna viewing angle on dry and wet tropospheric delay estimates, the results show that: The estimated value of dry tropospheric delay is significantly affected by the visual angle of antenna, and the estimated value of wet tropospheric delay is less affected by the visual angle of antenna.

TN959. 7

海洋环境安全保障重点专项资助项目(2016YFC1401004)