In the recent years, a large set of satellite constellations has been proposed to address communication services with worldwide coverage and once data is in the sky, a major issue consists of redistributing it on Earth in a proper way. This work addresses the routing problem in satellite networks. An optimization model is presented. In our model, the communication flow is not divided in several...

information technology has demolished time and distance. the new communication technologies have become dominant in contemporary world politics. the tools such as mobile phones, internet and satellite networks play supporting role in social changes with strengthening public space. we witness the effectiveness of new media in the recent unprecedented developments in arabic countries. the social ...

The National Institute of Information and Communications Technology (NICT) has been studying a new mobile communication system, named Satellite-Terrestrial Integrated Mobile Communication Systems (STICS)[1]. The STICS is a mobile phone system in which terrestrial mobile and satellite communication systems coexist, and is seamlessly integrated in the same frequency band. We aim for the realizati...

The enormous growth for Wireless broadband services and huge take up of mobile technology demands for higher data rate services.For a communication network to be successful only provisioning of high data rates alone is not sufficient, but also should provide wide coverage.Both satellite and terrestrial networks cannot guarantee this on their own. This incapability is attributed to capacity of c...

Recently, earth observation system by using satellite network have attracted much attention due to their wide coverage and disaster resistance. Although the system is useful for collecting various data, which have an affect on a natural disaster, ecology and so forth, earth observation satellite hardly send the collected observation data to the ground station. This is because that the earth obs...

Communication via satellite begins when the satellite is positioned in the desired orbital position. Ground stations can communicate with LEO (Low Earth Orbiting) satellites only when the satellite is in their visibility region. The ground station’s ideal horizon plane is in fact the visibility region under 0 ̊ of elevation angle. Because of natural barriers or too high buildings in urban areas,...

The Military is embracing the communication revolution, turning to a new generation of sophisticated systems to enable faster, richer, less costly, more flexible, reliable, compact, mobile, jam resistant, low probability of detection, re configurable and spectrally efficient communication. Many of these features can be added to a great extent in the existing systems, by utilising MIMO technolog...

As the data rate requirements for space communications increases, significant stress is placed not only on the wireless satellite communication links, but also on the ground networks which forward data from end-users to remote ground stations. These wide area network (WAN) connections add delay and jitter to the end-to-end satellite communication link, effects which can have significant impacts...

The objectives of on-orbit servicing (OOS) missions include manipulation, proximity operations and inspection of target satellites. Therefore the servicer satellite often has to be teleoperated at low latency for several minutes to fulfill these tasks. That means communication plays a crucial role for OOS missions because real time teleoperation including high data rates has to be realized. So ...