Stealth radio hides signal in background noise to protect drone pilots

A new military-grade radio technology, which cleverly conceals communications within background noise, presents an innovative solution to the challenge of operating drones undetected. This technological advancement emerges from the escalating demands of electronic warfare, where adversaries use jamming techniques to disrupt drone operations and pinpoint their locations through radio frequency tracing.

The US-based start-up Rampart Communications has developed a cutting-edge radio known as the StrataWave radio, leveraging two sophisticated layers of protection to ensure the signal remains undetectable. The device encrypts signals and spreads them across an array of frequencies—this dispersion minimizes the audibility of radio emissions, effectively masking communications.

While previous techniques have offered similar benefits, StrataWave enhances this by completely scrambling the broadcast, rendering the very presence of a transmission indistinguishable among background noise. According to Aaron Correa from Rampart, “Without the correct encryption key and algorithm, the signal will appear as noise to any other receiver.”

StrataWave was publicly introduced at the Pentagon’s Technology Readiness Experimentation (TREX) event held at Camp Atterbury, Indiana, in August, where it performed successfully in a demonstration, managing to fly a drone over jamming systems undisturbed. Rampart asserts that the device has successfully completed over 60 jamming scenarios, repeatedly proving its ability to evade detection by enemy counter-drone systems.

The implications of StrataWave are significant; it potentially allows drone operators to boost power levels without fear of discovery, facilitating secure long-range communication capabilities. As outlined by Michael, commander of Ukraine’s Typhoon drone unit, operators typically limit power levels to maintain stealth: “Raising transmitter power increases both your signal strength and your exposure.”

The dynamic of electronic warfare is a continuous back-and-forth, where each advancement invites a countermeasure. In the context of Ukraine, drone systems undergo frequent updates to outpace enemy jammers. With Rampart’s technology, adversaries will encounter a formidable challenge in detecting or jamming StrataWave’s sophisticated signals.

Electronic warfare expert Thomas Withington from the Royal United Services Institute (RUSI) cautions, however, that while novel systems may initially appear effective, they can be vulnerable over time. He notes, “Radio frequency engineers will tell you that every new system works brilliantly—until it doesn’t.” Innovations in artificial intelligence and cognitive radio technologies constantly improve the identification of hidden signals, yet StrataWave may provide a significant temporary advantage, which can be decisive in critical military operations.