In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon. The world’s first artificial satellite, the Sputnik 1, was launched by the Soviet Union in 1957. Since then, thousands of [...]
Broadband satellite communication networks, operating at Ka band and above, play a vital role in today's worldwide telecommunication infrastructure. The problem, however, is that rain can be the most dominant impairment factor for radio propagation above 10 GHz. This paper studies bandwidth and time slot allocation problem for rain faded DVB-RCS satellite networks. We investigate how [...]
The earthquake lies within a 70-km-wide (44 miles) set of major faults of the San Andreas Fault system that forms the boundary between the Pacific and North American tectonic plates. The persistent northwestward movement of the Pacific plate relative to North America primarily causes right-lateral slip across the major faults, but also causes deformation between [...]
Featuring on-board power systems, climate control, full radio communications package and CAT5 computer network, this Farber Specailty Vehicles multi-agency Mobile CommandPost Vehicle was custom built for the Solano County, California. […]
SUMMARY Convergence is one of the most important challenges for Next Generation Networks (NGN). This includes service convergence as well as fixed-mobile convergence. The integration of satellite telecommunication system into NGN is a key to increasing the coverage of future networks and opening satellite access networks to a wider range of terrestrial solutions. Digital Video [...]
Dallas, Texas (PRWEB) August 07, 2013 – Today Katonah-Lewisboro School District announced the acquisition of the Squire Tech Solutions LLC Business Continuity 600 satellite communications package providing alternative emergency communications for the K-12 critical administrative location. The selection of Squire Tech came after months of research and analysis of alternative communications options should local telephone, [...]
First the good news: Universities and research institutions in Texas suffered far less damage than some had feared from Hurricane Ike. Now, the bad news: It could take weeks for the University of Texas Medical Branch (UTMB) on the flooded island of Galveston and satellite Texas A&M campuses in the Galveston area to be fully [...]
SUMMARY The campaign to collect rain attenuation data on terrestrial links had commenced in Malaysian tropical climates for almost two decades. The terrestrial data so far collected have been greatly utilized to derive useful statistics for various microwave applications, such as frequency scaling, rain rate conversion factor, 1-min rain rate contour maps, wet antenna losses, [...]
SUMMARY Satellite transmissions are prone to both unintentional and intentional RF interference. Such interference has significant impact on the reliability of packet transmissions. In this paper, we make preliminary steps at exploiting the sensing capabilities of cognitive radios for reliable satellite communications. We propose the use of dynamically adjusted frequency hopping (FH) sequences for satellite [...]
