Improved Stochastic Modeling in GRACE/GRACE-FO Real DataProcessing 2 (ISTORE-2)

作为第一阶段的延续，IP5将致力于完成GRACE和GRACE- fo重力场调整的优化随机建模。这包括三个主要任务：(1)扩展第一阶段的随机仪器误差模型，包括分析更长的时间周期的加速度计数据和其他关键的GRACE和GRACE- fo仪器数据，如GNSS、距离和距离加速度；(2)不同观测数据组合的优化，其中加速度计数据也应作为观测数据处理，以便更直接地考虑各自的随机模型；(3)在平差过程中纳入潮汐和随时间变化的非潮汐背景模型误差方差-协方差矩阵。

In continuation of the first phase, IP5 will work towards the completion of the optimized stochastic modeling for GRACE and GRACE-FO gravity field adjustment. This includes three main tasks: (1) the extension of the stochastic instrument error models of the first phase including analyses of accelerometer data for longer time periods and of other key GRACE and GRACE-FO instrument data like GNSS, ranges and range accelerations; (2) the optimization of the combination of the different observations, where also the accelerometer data should be treated as observations in order to take into account the respective stochastic models in a more direct way; (3) the inclusion of tidal and temporally changing non-tidal background model error variance-covariance matrices in the adjustment process.