The Mercury Orbiter Radio Science Experiment (MORE) of the ESA mission BepiColombo will provide an accurate estimation of Mercury’s gravity field and rotational state, improved tests of general relativity, and a novel deep space navigation system. The key experimental setup entails a highly stable, multi-frequency radio link in X and Ka band, enabling two-way range rate measurements of 3 micron/s at nearly all solar elongation angles. In addition, a high chip rate, pseudo-noise ranging system has already been tested at 1-2 cm accuracy. The tracking data will be used together with the measurements of the Italian Spring Accelerometer to provide a pseudo drag free environment for the data analysis. We summarize the existing literature published over the past years and report on the overall configuration of the experiment, its operations in cruise and at Mercury, and the expected scientific results.

ESA任务BepiColombo的水星轨道无线电科学实验（MORE）将提供对水星重力场和旋转状态的准确估算，改进的广义相对论测试以及新颖的深空导航系统。关键的实验装置需要在X和Ka波段建立高度稳定的多频无线电链路，从而能够在几乎所有太阳延伸角处进行3微米/秒的双向测距速率测量。此外，已经以1-2 cm的精度测试了高码片率伪噪声测距系统。跟踪数据将与意大利弹簧加速度计的测量值一起使用，以提供用于数据分析的伪无阻力环境。我们总结了过去几年发表的现有文献，并报告了实验的总体配置，