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Free-space laser communications are subject of current research and development in many research and industrial\udbodies. Long distance air-ground and space-ground can be implemented in future communication networks as feeder,\udbackbone and backhaul links for various air- and space-based scenarios. The Institute of Communications and\udNavigation of the German Aerospace Center (DLR) operates two ground stations to investigate the communication\udchannel and system: the Optical Ground Station Oberpfaffenhofen and the Transportable Optical Ground Station. The\udfirst one is a fixed installation and operated as experimental station with focus on channel measurements and tests of new\uddevelopments. Various measurement devices, communication receivers and optical setups may easily be installed for\uddifferent objectives. The facility is described with its dome installation, telescope setup and infrastructure. Past and\udcurrent deployment in several projects is described and selected measurement achievements presented. The second\udground station is developed for semi-operational use and demonstration purposes. Based on experience with the\udexperimental ground station, this one is developed with higher level of integration and system robustness. The focus\udapplication is the space-ground and air-ground downlink of payload data from Earth observation missions. Therefore, it\udis also designed to be easily transportable for worldwide deployment. The system is explained and main components are\uddiscussed. The characteristics of both ground stations are presented and discussed. Further advancements in the\udequipment and capability are also presented

Ground stations for aeronautical and space laser communications at German Aerospace Center