Free-space laser communications are subject of current research and development in many research and industrial bodies. Long distance air-ground and space-ground can be implemented in future communication networks as feeder, backbone and backhaul links for various airand space-based scenarios. The Institute of Communications and Navigation of the German Aerospace Center (DLR) operates two groun...

Ground stations which integrate the control segment of a satellite mission have as a common feature, the use of large reflector antennas for space communication. Apart from many advantages, large dishes pose a number of impairments regarding their mechanical complexity, low flexibility, and high operation and maintenance costs. hus, reflector antennas are expensive and require the installation ...

With the increasing reliance on space systems for communications, the number of multi-satellite, multimission operators, in both the government and commercial sectors, is also increasing. To prevent the operations and maintenance costs from increasing linearly, or worse, with the number of satellites, operators are attempting to consolidate operations and maintenance across the satellite fleet....

Long time series of ozone and NO2 total column measurements in the southern tropics are available from two ground-based SAOZ (Système d’Analyse par Observation Zénithale) UV-visible spectrometers operated within the Network for the Detection of Atmospheric Composition Change (NDACC) in Bauru (22 S, 49 W) in S-E Brazil since 1995 and Reunion Island (21 S, 55 E) in the S-W Indian Ocean since 1993...

The space robot is the indispensable tool for future space activities such as building and operation of the international space station, inspection and repair of orbiting satellites, and conducting lunar/planetary explorations. The rendezvous docking technology to meet and to connect two spacecraft in-orbit is also an essential technology for the future space missions such as logistic support o...

A satellite ground station for participation in the Canadian project MOST (Microvariability and Oscillations of Stars) has been set up and is being successfully operated since October 2003 at the Institute for Astronomy of the University of Vienna. The location of the ground station is in a densely populated region of the town. The station has been built at costs affordable for Universities usi...

Evapotranspiration (ET) plays an important role in the hydrological cycle of river basins. Studying ET Yellow River Basin (YRB) is greatly significant for scientific management water resources. Here, we made full use advantages Gravity Recovery and Climate Experiment (GRACE) GRACE Follow-On (GRACE-FO) gravity satellites monitoring large-scale changes to calculate terrestrial storage anomaly (TW...