| | Global Broadcast System/Joint Broadcast System (GBS/JBS) |
| |
| | Primary Purpose | Global Broadcast System will provide worldwide, |
| | high capacity, one-way transmission of a variety |
| | of high speed computer-to-computer updates, high |
| | quality imagery and other high bandwidth |
| | information products to supported forces. GBS |
| | will be a system of broadcast managers, injection |
| | points, broadcast satellites, receiver |
| | terminals, and the management process for |
| | requesting and coordinating the distribution of |
| | informational products. The Joint Broadcast |
| | System (JBS) is the GBS European counterpart. |
| | Sub-Functions | 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. |
| | Equipment Requirements | Receiver terminal, desktop computer. |
| | Connectivity Requirements | GBS is an extension of the Defense Information |
| | Systems Network (DISN) and a part of the overall |
| | DoD MILSATCOM architecture. Users will need to |
| | be able to connect to this architecture and get |
| | DISN services. |
| | Crypto Requirements | The GBS Phase II system operates in both Ka and |
| | Ku frequency bands with data rates up to 96 Mbps |
| | per GBS Satellite. |
| | Normal Locations | The GBS will provide broadcast services to |
| | selected echelons through a layered or scaleable |
| | architecture. This architecture will compensate |
| | for differences in security (classification) |
| | levels and classes of users, and the ways in |
| | which users receive information products. |
| | Information Managed | Real-time information, video, data, imagery as |
| | well as theater and national level intelligence |
| | to the joint military forces. |
| | Products Created | N/A |
| | Lead Service/Contractor | Hughes Information System (HIS). |
| | Current Fielding Status | Due to the decision regarding the UHF Follow-On |
| | spacecraft GBS capability, the space segment |
| | assets have three distinct phases of fielded |
| | capability. |
| | |
| | Phase I extends from FY96-FY98+, Phase II from |
| | FY98-FY06+ and Phase III should be operational by |
| | FY06. |
| | |
| | GBS Phase I is currently integrating the |
| | information dissemination and broadcast |
| | management products from external programs such |
| | as the Battlefield Awareness and Data |
| | Dissemination (BADD) Advanced Concept Technology Demonstration
(ACTD) and the BC2A Joint Broadcast Service
(JBS).
Phase II will evolve the Phase I capabilities and establish an interim operational capability using GBS transponder packages hosted on the Navy's UHF Follow On (UFO) satellites 8, 9 and 10. Each GBS transponder package has two 30 GHz (K band) uplink antennas and three 20.2-21.2 GHz (Ka band) downlink spot beam. Phase III will further evolve the capabilities of Phase II and will increase on-orbit capacity. |
| Known Problems | Since GBS enables the storage, retrieval and |
| dissemination of huge information files that |
| would quickly exceed the capability of most |
| mobile users, the tailoring of the "push and |
| pull" dissemination architecture for GBS is a |
| significant challenge. The GBS broadcast is |
| one-way; it will only distribute information. |
| Requests for information will be made via other |
| communications means. |
| DIICOE Compliance Rating | N/A |
| Point of Contact | MILSATCOM Joint Program Office |
| Los Angeles Air Force Base |
| Updated by | Captain Jahan Tolliver, USA, CCSC-01 |
|
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