The invisible battlefield: Why spectrum dominance is the ultimate weapon - opinion

While the precise operational details regarding the recent war involving Israel, the United States, and Iran remain highly classified, one reality is undeniable: Both Israel and the US have successfully executed highly accurate operations across vast distances. Feats of this magnitude can only be accomplished by maintaining a continuous, unbroken flow of data to striking forces thousands of kilometers away.

The true lethality of modern warfare does not stem simply from ingenious new tactics or novel kinetic weaponry. Rather, it lies in the seamless collection, transmission, and processing of information between thousands of combatants in real time.

In ancient times, the Phalanx formation provided Alexander the Great with a revolutionary tactical advantage through the physical synchronization of men acting as a single, devastating unit. Today, the core concept remains exactly the same, but the scale has expanded exponentially.

Modern military superiority relies on the absolute synchronization of air, land, sea, and special operations units. The invisible force enabling this ultimate synchronization is the Electromagnetic Spectrum (EMS).

The foundational rule of spectrum management used to be elementary: avoid frequency overlap at all costs. Assigning distinct systems to distinct frequencies prevented signal interference.

In the modern battlespace, however, this basic principle is almost obsolete. Much like the civilian sector – where a single person might simultaneously broadcast from a phone, smartwatch, laptop, earbuds, and Bluetooth trackers – a modern combat unit is saturated with active EM emitters.

This creates an incredibly dense and noisy local environment. Compounding this challenge is the military's absolute need for operational flexibility. To ensure life-saving transmissions cut through the noise, modern systems cannot rely on static channels; they must dynamically calibrate their EM emission characteristics, constantly adjusting power levels and frequencies on the fly to reach their targets.

The enemy, of course, relies on the spectrum too. Stripping them of this asset cripples their operational capacity, making the EM jammer one of the modern battlefield's most vital weapons. Yet jamming is inherently a double-edged sword. A powerful jammer that disrupts an adversary's communications can easily cause "electromagnetic fratricide," unintentionally blinding your own units in the process. 

Unlike the physical territories of land, sea, or air, the EM spectrum cannot be walled off or permanently occupied; it is a shared, borderless domain.

Ultimately, the spectrum itself is just invisible infrastructure. Its true value lies in the advanced systems designed to exploit it. But technology is agnostic. Because the underlying hardware and principles are known and accessible to both sides of a conflict, the race for spectrum dominance is relentless, making the precise management of these EM resources an absolute necessity for survival.

With EM resources being incredibly scarce, commanders must fit their tactical pieces together like a complex puzzle. While the spectrum is a non-physical space governed by frequencies, its actual use is heavily bound by physical constraints, such as the location of the unit and the wattage of the transmitter. Therefore, planning a military operation requires a strategy to "divide and conquer" the spectrum.

The first step is frequency separation – distinguishing military equipment from common commercial bands. The 2.4 GHz frequency, for example, is the standard for Wi-Fi; it will inevitably be flooded by civilian and enemy noise, making it highly unreliable.

When separate frequencies aren't available, forces use time differentiation. By synchronizing devices to transmit on the same frequency at alternating milliseconds, they can share a single EM resource without colliding.

Finally, there is physical separation. This involves spacing out the hardware geographically to prevent interference, but it remains the most difficult strategy to implement, as it directly restricts the mobility and operational flexibility of the combat units.

Securing a tactical victory requires absolute control and synchronization of the electromagnetic space. Yet, this invisible battlefield is crowded with civilian and military traffic alike. This congestion creates a critical blind spot: How do you identify a threat when the airwaves are already full? Today, artificial intelligence is bridging that gap. In the realm of spectrum warfare, AI algorithms are designed to constantly hunt for answers to four questions: Has a new transmission appeared? What is it? Where is it coming from? And what is its intent?

Because popular frequencies are almost entirely occupied at all times, finding a hostile signal is like finding a needle in an electromagnetic haystack.

A raw spike in energy means nothing on its own; it could be anything from a nearby Wi-Fi router to an enemy drone link. AI solves this by learning the "scenery." Over time, the system maps the normal, chaotic patterns of a shared civilian-military environment. It doesn't need to know exactly who is transmitting; it just learns what normal looks like.

When an unknown, irregular signal breaks that pattern, the AI acts as an immediate tripwire.

The challenge doesn't end at detection. In a dense EM environment, a suspicious transmission rarely arrives cleanly; it is mashed together with countless other regular signals. AI is utilized to mathematically untangle this mess, differentiating the distorted signal from the background noise to reveal its original, uncorrupted shape.

Once the pure signal is isolated, the AI references its learned libraries to classify the transmission, turning raw, chaotic noise into actionable military intelligence.

In the modern defense industry, designing a new platform requires evaluating its electromagnetic footprint from the ground up. Planners must actively avoid relying on highly trafficked spectral resources. Yes, it costs considerably more, in time and capital, to engineer proprietary tools that shift a device away from cheaper, readily available commercial frequencies.

But that initial investment is the ultimate difference between a system functioning or failing when the battlefield becomes hopelessly saturated with noise.

Ultimately, modern military designers must assume that access to the spectrum will never be guaranteed. Building layered redundancies and fallback systems is no longer an optional luxury; it is a vital prerequisite for surviving the inevitable moments when the EM spectrum is aggressively denied.

Dr. Omer Kaspi is a System Engineering consultant in the defense industry. He is a lecturer and researcher at Afeka College of Engineering and head of the Product Management specialty at Shenkar College of Engineering, Design and Art