Basic Mock Data Challenge 1

The data are the results of a pure dynamic orbit integration, in which only a static Earth’s gravity field model is taken as the force model. Hence other disturbing forces such as tides, drag, solar radiation pressure etc. are not included. The KBR data, provided in daily files with 5-second sampling rate contain 16 columns. The first four columns are: GRACE time, range, range_rate, range_accl. Columns 5 through 16 shall not be used and contain zero values for different corrections and the value 700 for K and Ka SNR. These columns are kept in the data to maintain the consistency with the official GRACE KBR1B format. The orbit products also contain 16 columns just similar to official GRACE GNV1B products. Nevertheless, these orbits are meant to be kinematic orbits and could be used as observations too. The entries are: GRACE time, satellite id, coordinate frame, x, y, z, sigma_x, sigma_y, sigma_z, vx, vy, vz, sigma_vx, sigma_vy, sigma_vz, quality flag. The standard deviations are formal errors for the orbit positions and the velocities.