Adaptive EW: How a Smart Shield Changes the Rules of War

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Imagine a mosquito trying to get into a dark room. Instead of killing it with a precise swat of a flyswatter, you detonate a grenade inside. That is roughly how classic bulky electronic warfare (EW) stations operate. They are indispensable for protecting large facilities, but on the front line their powerful signals effectively wipe out radio communications across a huge radius. This cuts off communications not only for the enemy but also for friendly units, while the stations themselves immediately become exposed targets, making them vulnerable to attacks with a wide range of weapons.

Today this approach is giving way to the concept of adaptive and trench-based EW systems. Large EW systems are being replaced by flexible distributed networks and portable sensor-analyzers. In Ukraine the development of such short-range systems is actively coordinated by the state defense technology cluster Brave1, which has created a dedicated platform Brave1 Market to scale frontline developments. Thanks to this, portable systems such as AD Counter FPV and PARASOL, developed by Ukrainian engineers to protect specific positions and armored vehicles, are already being supplied in large numbers to the Defense Forces.

How it works: from a solid wall of interference to a precision scalpel

The key difference between the new generation of systems and older designs lies in their use of automation and real-time signal processing. Instead of continuously jamming a wide range of frequencies, an adaptive EW complex operates covertly and activates only when a direct threat appears. The process is divided into two rapid stages.

First comes instantaneous spectrum analysis. A portable sensor-analyzer continuously scans the sky using compact high-speed electronic intelligence receivers that detect incoming enemy radio signals. As soon as a drone approaches, the adaptive system determines the exact frequency of the UAV’s control signal within fractions of a second.

Next comes narrowband jamming. The complex generates a precisely targeted jamming signal on the frequency used by the enemy drone.

Addressing interference with friendly communications and the risk of detection

This approach addresses two major drawbacks of older systems: interference with friendly communications and vulnerability to detection and enemy attack. A stationary wideband jammer continuously gives itself away in the airwaves, becoming a priority target for enemy strikes.

When an adaptive EW complex is deployed at a position, interference with communications on adjacent frequencies is minimized. This makes it possible to coordinate troop actions even while the jammer is operating. At the same time, modern adaptive systems can operate in pulsed mode, which makes them significantly harder to detect and locate using radio direction-finding.

Advantages and key vulnerabilities of adaptive systems

The transition to distributed trench networks provides a tremendous advantage, but at the same time poses new challenges for engineers.

Low detectability by enemy SIGINT systems. Older high-power EW stations stood out to enemy signals intelligence systems like beacons. Modern adaptive systems operate in pulsed mode, making them much harder to detect and locate.

Autonomy and mobility. Small sensors weighing only a few kilograms can easily be installed on armored vehicles, at infantry positions, or on the roofs of civilian buildings. New adaptive systems can automatically organize themselves into a single network and exchange data without human involvement.

Energy efficiency. Pinpoint jamming on a single frequency requires several times less energy than suppressing an entire band. These systems can operate for long periods on conventional rechargeable batteries.

However, the technology also carries major risks:

Dependence on processor speed. Drone swarms can change frequencies on the fly and use frequency-hopping spread spectrum (FHSS). If the analyzer's algorithm is too slow, a wave of UAVs could overwhelm the defenses.

Challenges in microchip production. Component shortages make it difficult to manufacture thousands of sensors.

EW takes to the sky: the concept of airborne protective domes against long-range threats

A logical next step in the evolution is to deploy adaptive sensors and jamming emitters on airborne platforms for continuous coverage. While a portable EW system on the front line acts as a local protective shield against close-range threats, protecting major cities far behind the front line requires an entirely different approach.

The main limitations of ground-based EW systems remain the radio horizon and terrain features behind which long-range propeller-driven and jet-powered enemy drones can hide. Placing an adaptive system on unmanned aerial vehicles or other airborne platforms allows it to operate at altitude and expand the detection zone. From altitude, the system can detect control signals from long-range drones tens of kilometers away, depending on flight altitude and radio propagation conditions.

Moreover, an airborne EW complex can jam the satellite navigation of drones from above. If a drone's antenna protection is designed primarily to counter jamming from the ground, it may be less effective against attacks from above. Far behind the front line, such airborne platforms can create an invisible adaptive barrier long before threats reach critical infrastructure and cities.

What this will change in the technological confrontation in the coming years

The transition from simple trench modules to high-altitude adaptive EW platforms can significantly reduce the effectiveness not only of FPV drones but also of other unmanned systems that use radio control links and satellite navigation.

Although drone manufacturers are trying to respond to this challenge by introducing fiber-optic control systems or machine-vision systems for terminal guidance, these technologies remain expensive and have their own limitations. Fiber-optic control restricts the drone’s freedom of movement to the length of the cable, while machine vision can perform less reliably in bad weather or smoky conditions.

Radio links and satellite navigation remain central to the threat posed by drones. This means that in the coming years the advantage will go to whichever side can adjust its EW systems to changing frequencies more quickly. War is turning into a contest of processor speed and software flexibility.