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Satellite Equipment & Systems
Research Library
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Symmetricom
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Satellite two-way time transfer has traditionally been used as a periodic measurement of the offset between two-clocks. It is often used as a secondary measurement to GPS or a sole means of time recovery with performance that is superior to GPS time transfer. In this paper, we propose a continuous two-way system based on commercial modems where the two-way time transfer is performed in the ...
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Symmetricom
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Time based communications (TBC) involves the use of an active data
channel for time transfer. TBC was demonstrated in 2000 using
commercial SATCOM modems for two-way satellite time transfer between
static locations. In 2002, testing was conducted with the Air Force
Research Lab (AFRL) at Wright Patterson Air Force Base to demonstrate
a TBC implementation from the ground to an airborne platform ...
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Axcera
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Consumers worldwide continue to demonstrate an insatiable desire for information and entertainment. In response to this demand, service providers must consider the most effective and efficient means of delivering wireless voice, video and data services. Many wireless delivery models exist, each with advantages and disadvantages. One of the newest methods for mobile television signal delivery ...
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Berkeley Varitronics Systems
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The CDMA system place new demands on component manufacturers, test equipment, and measurement techniques. Requirements for suppression of Adjacent Channel Power (ACP) have become more stringent than those required by the older analog systems. GSM systems, IS-54 or IS-136, use constant modulation envelope formats, and the digital TDMA and CDMA standards in North America use quadrature phase-shift ...
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AEP Networks
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Despite all the hype surrounding new VSAT applications and services, to this day VSAT remains the
staple diet for satellite communications operators. However, the industry is facing a host of
challenges in the market place, declining revenues, growing competition from terrestrial services
into areas proved profitable by VSAT deployments. An added challenge lies in the relatively
higher cost ...
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