Microwave link (MWL)
The MWL is a key element of the ACES mission. Developed by EADS under ESA responsibility, it ensures stable frequency transfer for direct comparison of atomic clocks on very long distances. The MWL will ensure both space-to-ground as well as ground-to-ground clock comparisons. Direct comparisons of ground clocks at high level of stability will be possible using both the common view and the non-common view technique.