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Global Broadcast Service (GBS)

By Editor | May 16, 2007

The GBS system is a space based, high data rate communications link for the asymmetric flow of information from the United States or rear echelon locations to deployed forces. The GBS system will “push” a high volume of intelligence, weather and other information to widely dispersed, low cost receive terminals.

GBS is a system of information sources, uplink sites, broadcast satellites, receiver terminals, as well as management processes for requesting and coordinating the distribution of information products. Each GBS satellite in a global constellation will be served by a primary uplink site where information products are assembled and transmitted up to a high-powered satellite for relay to forces over a large geographic area. GBS also has the capability to inject products directly from the theater it serves. The receive terminals for information can be large, but what makes GBS so attractive is the ability to provide high-volume data directly into 18-inch antennas. Mobile force elements are no longer restricted by the requirement for large, fixed antennas to receive information formerly relegated only to command centers. GBS is an extension of the Defense Information Systems Network (DISN) and a part of the overall DoD MILSATCOM Architecture. As such, it employs an open architecture which can accept a variety of input formats. It exploits commercial off-the-shelf (COTS) technology. It interfaces with, and augments other major DoD information systems, such as the Global Command and Control System (GCCS), as well as other theater information management systems.

The GBS system consists of broadcast management, space, and terminal segments. The broadcast management segment, integrates, encrypts and packages multi-media information and provides a bit stream to the Primary Injection Points (PIP) for Radio Frequency (RF) transmission to the satellite. The user receive terminal, consisting of a small satellite antenna, low noise block and receiver, will receive and convert the RF downlink signal into a bit stream for receive broadcast management decryption and distribution to end users. Information from http://www.globalsecurity.org/space/systems/gbs.htm