In the autumn of the year 2000, four radio receivers capable of tracking various beacon satellites were set up along the southwestern coast of Greenland. They are used to reconstruct images of the ionospheric plasma density distribution via the tomographic method. In order to test and validate tomographic imaging under the highly variable conditions often prevailing in the high-latitude ionosph...

To track a cyclone using a single orbiting satellite in a continuous manner is impractical as it has limited spatial and temporal coverage. One solution is to use multiple orbiting satellites for cyclone tracking. However, data from some orbiting satellites do not provide features as useful as other satellites in identifying cyclones. Moreover, satellite data containing strong cyclone discrimin...

the main purpose in this paper, to express strong algorithmic optimization in their ability to detect expression target of sar that use in aircraft, plane and satellites to observe the target on the ground. for this purpose,the sar technology and its applications are introduced. previous algorithms used in this field with poor diagnosis and appropriate speed is low, like means and fuzzy and pso...

High Rate / Low Latency GPS ground measurements for the GPS occultation experiment of the Challenging IV&risatellite Payload (CHAMP) mission are provided by a dedicated global tracking network. The r&work. is being established jointly by GF?Z and Jet Propulsion Latmratory (JPL) to ensure adequate ground d@a auail&iIity for processing of globally distributed GPS qccultadon events. GFZ operates a...

The first space very long baseline interferometry (SVLBI) mission—the VLBI Space Observatory Program (VSOP)—using an 8-m telescope in orbit, has been successfully operated since 1997, and several follow-on missions are in development or under discussion. The SVLBI missions are among the most complex space science missions to date in terms of operations and coordination of the disparate worldwid...

Quantum cryptography and quantum computation are based on the communication of single quantum states and quantum entanglement, respectively. Particularly in view of these high potential applications the question arises, whether quantum correlations can be sufficiently well communicated over global distances to be used in communication protocols as predicted by quantum mechanics. Various experim...

The Russian Federal Space Program includes a lot of prospective science missions which are intended for investigations in the different branches of fundamental space researches. Analysis of availability of the respective domestic ground stations shows the necessity of developing the very busy schedule of their usage. It increases risks and decreases the possibilities of control of the spacecraf...

There are a growing number of small satellites that are being launched and operated to accomplish novel science and technology missions. Scientists and mission operators are seeking to download large quantities of data from these small satellites, however they are resource-constrained and communicate to capacity-constrained ground networks. Motivated by the need for intelligent operational sche...