In a step toward modernizing electromagnetic warfare, the U.S. Defense Advanced Research Projects Agency (DARPA) announced this month the successful development of what it claims is the largest-ever real-time virtual testing environment for electromagnetic spectrum (EMS) operations.
The new system, known as the Digital RF Battlespace Emulator (DRBE), pronounced “Derby,” is designed to digitally mirror complex radio frequency (RF) scenarios with unprecedented fidelity, transforming how the U.S. military trains, tests, and develops next-generation electronic warfare (EW) capabilities.
DARPA’s announcement of DRBE signals a shift in how defense systems will be designed and validated in the digital era. At its core, DARPA says DRBE is an ultra-high-density simulation platform capable of reproducing real-world EMS conditions with hundreds of simultaneously active, full-duplex channels.
This enables the large-scale testing of electronic warfare tactics, signals intelligence tools, and adaptive radio systems, all within a controlled, repeatable, and secure virtual battlespace.
As global arms races continue to spread into the digital and cyberworld, DRBE aims to enhance U.S. military readiness by providing a powerful tool to explore the complex, congested, and often contested EMS environments that increasingly characterize modern conflict zones. Its strategic importance in future warfare cannot be overstated.
“DRBE is a leap forward in how we can prepare and equip RF systems against sophisticated adversaries,” DRBE program manager in DARPA’s Microsystems Technology Office, Dr. Anna Tauke-Pedretti, said in a statement. “DRBE is not only setting a new benchmark for real-time simulation but is also accelerating our ability to develop and refine advanced electronic warfare capabilities that keep pace with emerging threats.”‘
The need for such a testbed has been growing for years, as increasingly software-defined systems and AI-enabled signal processing have transformed the landscape of electronic warfare.
Traditional live-range testing, limited by geography, spectrum regulations, and safety constraints, has struggled to keep pace with the high-dimensional, rapidly evolving nature of RF threat environments.
With DRBE, DARPA is looking to overcome these constraints by creating a digital twin of the electromagnetic battlespace. This enables rapid iteration, high-volume testing, and sophisticated experimentation that is not feasible in the real world.
The system’s development is being led by the agency’s Microsystems Technology Office (MTO) and executed through collaboration with industry partners, including researchers from the 3D Systems Packaging Research Center at Georgia Tech University.
Ultimately, DRBE will be used to test and evaluate a wide range of advanced technologies, from AI-driven signal classification tools to autonomous jamming systems. It can support the emulation of dynamic mobile environments, including line-of-sight and non-line-of-sight propagation, as well as adversarial signal injection—all in real-time.
“DRBE is a catalyst, redefining the scale at which we can develop EW payloads and address complex challenges,” Chief Technologist at Aircraft and Spectrum Integration Environments, for the U.S. Navy, Jenifer Koch, explained. “It empowers our lab to craft solutions with unprecedented sophistication, significantly boosting our confidence in the effectiveness and reliability of our products.”
Importantly, DRBE also addresses a growing operational need within the Department of Defense to train military personnel and AI systems in complex, contested spectrum environments without the risk of interfering with real-world communications or revealing sensitive capabilities to adversaries.
With the DRBE, warfighters and emerging technologies can be immersed in realistic EW scenarios, including GPS denial, radar spoofing, and hostile communications jamming, without costly and time-consuming field testing.
In recent years, adversaries such as China and Russia have made aggressive moves in the EMS domain, fielding sophisticated jammers, spoofers, and EW-equipped drones to disrupt NATO communications and radar networks.
To help counter these emerging threats, DRBE was developed as part of the second phase of DARPA’s Electronics Resurgence Initiative (ERI): a five-year, $1.5 billion effort launched in 2019 to bolster the future of U.S. government and defense electronics systems.
By investing in foundational technologies like advanced RF emulation, high-performance computing, and secure microelectronics, ERI aims to rebuild domestic innovation pipelines and reduce reliance on foreign semiconductor supply chains, while enabling sophisticated tools like DRBE to support the rapid development and testing of next-generation EW capabilities.
Additionally, the potential benefits of DRBE extend well beyond the battlefield. Its ability to simulate complex spectrum environments is invaluable for advancing civilian technologies such as 5G and 6G networks, autonomous vehicles, and spectrum-aware Internet of Things (IoT) systems. This broad impact underscores the versatility of the technology.
While DRBE may not be a weapon in the traditional sense, its strategic value is immense. As RF environments become increasingly saturated and the cost of signal defeat becomes more catastrophic, the ability to simulate and dominate the invisible battlefield of the electromagnetic spectrum could be the determining factor in who controls the future of warfare.
“DRBE isn’t just a test tool. It has the potential to be a strategic enabler for next-generation defense technologies,” Dr. Tauke-Pedretti explained. “By pushing the boundaries of real-time emulation and compute (sic), we’re laying the groundwork for smarter, faster, and more resilient EW systems.”
Editor’s Note: An earlier version incorrectly stated that DRBE is being led by DARPA’s Strategic Technology Office. The article has been updated to accurately reflect the program as being managed by DARPA’s Microsystems Technology Office (MTO).
Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan. Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com