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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


Phase I extends from FY96-FY98+, Phase II from

FY98-FY06+ and Phase III should be operational by


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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