The inter-satellite link is an important technology to improve the accuracy of clock offset measurement and prediction for BeiDou Navigation Satellite System (BDS). At present, BDS measures offsets invisible satellite mainly through “one-hop” reduction mode based on satellite-ground node visible between two satellites. However, there exists a systematic deviation caused by reduction, still larg...

The recent European Telecommunications Standards Institute (ETSI) decision to endorse for the Universal Telecommunication Radio Access ??? (UTRA) techniques based upon wideband-CDMA approaches for terrestrial UMTS (T-UMTS) paired frequency duplexing band will certainly constitute an important driver to orientate the corresponding choice for the satellite UMTS (S-UMTS) component. In this paper i...

In this article, we are going to do a study that consist in the configuration of a link between an earth station to broadcast multimedia service and a user of this service via a geostationary satellite in Kaband and the set up of the different components of this link and then to make the calculation of the link budget for this system. The application carried out in this work, allows us to calcu...

We suggest a direct, causal link between the two ‘missing’ baryon problems of contemporary galaxy formation theory: (1) that large galaxies (such as the Milky Way) are known to contain too little gas and stars and (2) that too few dwarf satellite galaxies are observed around large galaxies compared with cosmological simulations. The former can be explained by invoking some energetic process – m...

In order to provide for the safe integration of unmanned aircraft systems into the National Airspace System, the control and non-payload communications (CNPC) link connecting the ground-based pilot with the unmanned aircraft must be highly reliable. A specific requirement is that it must operate using aviation safety radiofrequency spectrum. The 2012 World Radiocommunication Conference (WRC-12)...

Satellites represent a well-assessed approach for delivering broadband service. Several satellite systems either currently operating or in various stages of development intend to support applications with increasing data-rates. Of course, to achieve success, these systems must provide Internet services requiring the support of Internet protocols, especially TCP. Unfortunately, TCP suffers from ...

The use of dual polarization in mobile satellite systems is very promising as a means for increasing the transmission capacity. In this paper we study a system which uses simultaneously two orthogonal polarizations in order to communicate with the users. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable thro...

Most small satellites operations, including those in the CubeSat community, maximize the duration of single communication passes with ground stations, but, in doing so, do not maximize the total data transferred. In this paper we examine methods to maximize data download by waiting to begin transmission at a non-intuitive high elevation angle. This elevation angle reduces the slant distance and...

Mobile communication on the multi-beam satellite communication has attracted attention, since Digital Video Broadcasting – Return Channel Satellite (DVB-RCS) has been successively implemented. In general, multi beam satellite employs uniform allocation of RF power and bandwidth to multi beams, since it is hard to predict the distribution of traffic requests and the arrival rate of new connectio...

An experiment has been devised which will validate, in space, a miniature, high-performance receiver. The receiver blends three complementary technologies: high temperature superconductivity (HTS), pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuits (MMIC), and a miniature pulse tube cryogenic cooler. Specifically, an HTS band pass filter, InP MMIC l...