The Battlefield Airborne Communications Node (BACN) is a United States Air Force (USAF) airborne communications relay and gateway system carried by the unmanned EQ-4B and the manned Bombardier E-11A aircraft. BACN enables real-time information flow across the battlespace between similar and dissimilar tactical data link and voice systems through relay, bridging, and data translation in line-of-sight and beyond-line-of-sight situations. Its ability to translate between dissimilar communications systems allows them to interoperate without modification.
Because of its flexible deployment options and ability to operate at high altitudes, BACN can enable air and surface forces to overcome communications difficulties caused by mountains, other rough terrain, or distance. BACN provides critical information to all operational echelons and increases situational awareness by correlating tactical and operational air and ground pictures. For example, an Army unit on the ground currently sees a different picture than an aircrew, but with BACN, both can see the same picture.
On 22 February 2010, the US Air Force and the Northrop Grumman BACN Team received the 2010 Network Centric Warfare Award from the Institute for Defense and Government Advancement.
On 27 January 2020, a USAF E-11A crashed in Afghanistan, killing both crew members on board.
Purpose
Individual tactical data links, such as Link 16 and EPLRS, are part of the larger tactical data link network, encompassing tactical data links, common data links, and weapon data links. Most military platforms or units are equipped with a tactical data link capability tailored to their individual missions. Those tactical data link capabilities are not necessarily interoperable with one another, preventing the digital exchange of information between military units. BACN acts as a universal translator, or gateway, that makes the tactical data links work with one another. BACN also serves as an airborne repeater, connecting tactical data link equipped military units that are not within line of sight of one another.
Background
Interoperability between airborne networking waveforms has been a persistent challenge. There have been multiple systems developed to address the challenge to include Air Defense Systems Integrator (ADSI), Gateway Manager, and Joint Range Extension (JRE) product lines. However, those product lines were separately funded/maintained and had interoperability concerns of their own. The solution was an "Objective Gateway" which would serve as a Universal Translator to make data from one network interoperable with another.
In 2005, the USAF's AFC2ISRC and ESC created BACN as an Objective Gateway technology demonstrator to provide voice and data interoperability between aircraft in a single battle area. The four key principles were radio agnostic - it would support a variety of communication protocols platform agnostic - BACN could be mounted on a variety of aircraft un-tethered - unlike previous repeaters, which were hung from floating aerostats, BACN has the ability to move within the battlespace Knowledge-based intelligence - the ability to sense waveform characteristics of sender and receiver and automatically route traffic.
The BACN first flight was November 2005 at MCAS Miramar in San Diego, CA.
BACN was successfully demonstrated in Joint Expeditionary Force eXperiment (JEFX) 2006 and JEFX 2008 and selected for field deployment.
Joint support
Getting critical air support to troops in contact with the enemy supports both troops on the ground and in the air.
This project is not limited to combat operations. It has provided the World Food convoy commander with “comms-on-the-move.” This capability allows convoys to stay in continuous contact with air support and with command channels in complex or adverse terrain, while mitigating exposure to attacks as the node is continually moving.
Platforms
The BACN prototype was originally developed and tested in 2005–2008 on the NASA WB-57 high altitude test aircraft during Joint Expeditionary Force Experiments and other experimentation venues. The last two flying WB-57s were used for this mission in Afghanistan.