Two-way global broadcast system architecture

Abstract

The Global Broadcast System (GBS) implemented by the U. S. Department of Defense utilizes commercially-based Digital Video Broadcast (DVB) technology to enable highrate (IO'S of Mb/s), one-way, data dissemination to a large number of users. Currently, however, user terminals are limited to receive-only operation. For many users, a receive-only configuration is not adequate and a low to medium-rate (10's to 100's of kb/s) return channel is required for true network-centric operations and enhanced mission effectiveness. This paper describes a frequency re-use architecture that provides such return channel connectivity to a large number of users without requiring additional satellite bandwidth and with minimal interference to current receive-only users.

Increased dynamic range multi-rate waveform for mobile satellite communications: Adaptive Coding Spreading and Modulation (ACSM)

“…Antenna size varies significantly across the different types of mobile platforms due to the physical constraints of those platforms. For example, in a typical ArcLight® Ku-band network [1] [2] , the smallest antennas tend to be 0.3 meter reflectors mounted on business jets and the largest are typically 1 meter reflectors onboard relatively large vessels at sea. Ground-vehicles and smaller vessels tend to use antennas in the 0.45 meter to 0.6 meter range.…”