Countering rogue drones with net based capture

Over the past decade, small drones have gone from expensive military equipment to everyday gadgets that almost anyone can buy. This is a good thing for photography, delivery, and agriculture, but it has also created a serious societal problem: small, cheap drones flying where they should not be. These aircraft, often called low, slow, and small UAVs (LSS-UAVs), are hard to detect, hard to stop, and easy for almost anyone to operate. They are used for smuggling, illegal surveying, terrorist attacks, and disrupting critical communication networks. The tools designed to stop them were built for the battlefield, where destroying a target matters more than protecting the people standing below it.

The scale of the problem is real and measurable. In 2020, the Federal Aviation Administration received more than 100 reports of unauthorized drone sightings per month, and pilots described close encounters in which drones followed aircraft from several hundred feet away down to about one wingspan. The war in Ukraine has pushed the issue even further, since cheap commercial drones and first-person-view aircraft now appear on nearly every part of the battlefield. At the same time, a drone cannot simply be destroyed over a city, because the falling wreckage endangers the very people the response is meant to protect.

The purpose of this paper is to describe this problem, explain its significance to society, trace its history, identify the populations it harms, analyze its root causes and consequences, and evaluate possible areas for intervention. A central argument of this paper is that the current approach, which relies on shooting drones down or jamming them, is a poor fit for civilian settings because it creates falling debris, interferes with communications, and destroys evidence. Physical net capture offers a non-destructive alternative that is low in cost and simple to operate. A student prototype launcher built at the University at Buffalo, for example, cost less than $50 in materials, which shows how cheap this class of solution can be.

The problem at its core is simple to state: there is no good way to stop an unauthorized drone without creating new dangers. A proper counter-drone system should intercept a drone without generating dangerous debris and while keeping the aircraft intact enough for forensic examination. If a drone is destroyed in midair, its parts fall on whatever is below. If it is jammed, it may crash in an uncontrolled way, and nearby communications can suffer. In both cases, the operator is hard to identify and the evidence is damaged or destroyed.

This matters because drones are more accessible and cheaper than ever, and violations are increasing. In 2023, 1,067,112 drone-related violations were recorded, and as technology gets more advanced and accessible that number is only going up. These violations range from simple cases, like a personal camera drone flying at an event where the airspace should be clear, to serious cases like domestic terrorism and war. Society needs a method to stop and capture drones that does not put the lives and safety of those under the drone in jeopardy, and that also allows law enforcement to trace and identify the operator so the right charges can be brought.

Most existing solutions were pioneered for war use cases, where debris and collateral risk matter less because things are exploding anyway and stopping the drone is the highest priority. This leaves everyday law enforcement and civilians without a practical option. Military technology cannot simply be transferred to civilian violations because of safety, cost, and practicality. This gap between military capability and civilian need is exactly where the problem sits, and it is where low-cost net capture comes in.

The unmanned aerial threat is older than most people think. In 1849, Austria attacked Venice using unmanned explosive balloons, which is often cited as an early military use of an unmanned aerial system. At that time there was no specialized counter-drone field at all. Defenders relied on conventional air-defense concepts and had few practical ways to engage an object with no crew on board. Through World War I and the Cold War, radio-controlled aircraft, aerial targets, reconnaissance UAVs, decoys, and larger military drones developed step by step, but countermeasures stayed mostly conventional: air-defense radar, fighter aircraft, anti-aircraft artillery, missiles, and electronic warfare. The targets were military, relatively scarce, and much larger than a modern quadcopter, so the old methods worked well enough.

Everything changed in the 1990s and 2000s, when GPS, lithium batteries, miniaturized cameras, digital autopilots, MEMS sensors, and cheap communications hardware matured. These technologies made small autonomous and remotely piloted aircraft practical outside major military programs and laid the technical foundation for the consumer drone era. In the early 2010s, consumer quadcopters became mass-market products, with models like the DJI Phantom. Features such as GPS position holding, stabilized video, return-to-home, and first-person-view systems sharply lowered the skill required to fly useful aircraft. The threat profile changed from a few expensive military UAVs to inexpensive, portable, disposable platforms that could be bought and flown by civilians, criminals, protestors, hobbyists, or hostile actors.

Governments responded first with rules and later with active authority. The 2012 FAA reauthorization established a framework for integrating civil drones into the national airspace, and in 2015 the FAA announced a registration task force for small unmanned aircraft as an early attempt at accountability. Incidents near airports, prisons, public events, and sensitive facilities pushed security organizations to invest in specialized detection such as short-range radar, radio-frequency sensing, electro-optical and infrared cameras, and acoustic detection, along with the realization that conventional air-defense radar often cannot reliably see very small, low-flying drones. The turning point for the military came in 2016, when ISIS and other actors in Iraq and Syria used small drones for reconnaissance, targeting, propaganda, and improvised explosive attacks. RAND notes that the United States counter-drone mission grew directly out of this operational experience. Later, the FAA Reauthorization Act of 2018, including the Preventing Emerging Threats Act, gave the Department of Homeland Security and the Department of Justice counter-UAS authority in specified situations, and in January 2021 the FAA finalized Remote ID rules, which let compliant drones broadcast identification and location data, though this does nothing about noncompliant or hostile aircraft.

The war in Ukraine, which began in 2022, made cheap commercial and first-person-view drones a routine tactical tool on both sides for reconnaissance, artillery correction, mine spotting, logistics, and attack. It also accelerated adaptation, as electronic warfare became central while adversaries responded with more autonomous systems, alternative guidance, and fiber-optic control links that resist conventional radio-frequency jamming. By 2022 the United States Army had formally added counter-small UAS to its air-and-missile-defense modernization portfolio, treating small-drone defense as a permanent requirement rather than a temporary mission, and several of its programs entered full-rate production by fiscal year 2024. As of today, civilian discussion centers on airports, prisons, stadiums, critical infrastructure, and public events, and the main unsolved issue is authority and safety, since non-federal users can detect and report drones but generally cannot legally or safely neutralize them.

Everyday citizens are affected first. People in crowded areas, such as stadiums, festivals, and city centers, are vulnerable to collateral damage when a drone is destroyed in the air above them, since debris falls straight down onto the crowd. Citizens are also affected by surveillance, because a camera drone can observe private homes and restricted areas from the sky without anyone noticing, turning an ordinary neighborhood into a place with no privacy from above.

Military and national defense organizations are affected because drones can easily enter sensitive airspace and perform close-range reconnaissance with very little risk to the operator. A drone that costs a few hundred dollars can film a base, a ship, or a convoy, and the defender often has no response that is proportionate, legal, or affordable. Critical infrastructure operators are affected as well. Airports, prisons, power plants, and communication sites are attractive targets, especially considering how cost-effective drones are as an attack or smuggling tool. A single unknown aircraft can ground hundreds of flights, and contraband can be delivered into a secure facility at night with almost no trace.

Society in general carries the broadest burden. Drones can contribute to drug trafficking, smuggling, violent attacks, terrorism, and illicit intelligence gathering. They cause economic losses and threaten social stability. Part of what makes this so difficult is that malicious drones blend in easily with normal ones. A drone filming a wedding and a drone scouting a target look exactly the same to an observer on the ground, which means every legitimate flight creates cover for an illegitimate one and makes enforcement harder for everyone.

The first root cause is economic asymmetry. Adversary drones are, relatively speaking, absurdly cheap to manufacture and extremely cost effective. The ammunition used to shoot down a single drone can cost more than the drone itself, which makes using drones a very low-risk activity. A defender who spends thousands of dollars per engagement against a target that costs hundreds is losing the exchange even when the shot succeeds, so the threat multiplies faster than the defense can keep up.

The second root cause is physical accessibility. These drones are small, lightweight, and easy to carry, so it is very easy to bring one close to a target unnoticed and launch from almost anywhere. Almost no training is needed, because modern drones are easy to operate, launch, and recover, so anyone can use one. There is no launch site to secure, no pilot to license, and no flight plan to track, which removes nearly every checkpoint that traditional aviation security depends on.

The third root cause is a technical mismatch with existing defenses. These drones usually fly at low altitudes, which lets them ignore traditional anti-air defenses designed for aircraft and missiles. They are also hard to detect on radar due to their small reflective area, so a system built to see a jet at 30,000 feet will often miss a plastic quadcopter at 200 feet. These causes feed into each other: overall, these drones are cheap to produce, operable by anyone, easily weave past defenses, and are expensive to stop. Innovation on the attack side makes this worse, because since the Russian invasion of Ukraine started in 2022, research and development for drones has increased exponentially, with development cycles shifting from two to five or more years down to mere weeks. Defenses that took years to design now face threats that change monthly.

The short-term effects fall into three groups: operational disruption, public security, and safety. Operationally, airports have to ground planes when a drone is reported, and law enforcement and emergency services that require the airspace are blocked from doing their work. Search and rescue, wildfire response, and airlifting all depend on clear skies, and in an emergency, bystanders often launch drones to see and film the scene, which directly interferes with those very services. For public security, an unknown drone with unknown intent over a big stadium or event can cause stalling or even full evacuation due to safety concerns and protocol, even if the drone turns out to be harmless. The disruption cost is paid whether or not the drone was hostile.

The safety effects are more direct. Drones can be used as weapons, carrying bombs or flying kamikaze-style attacks. Drones with loose connections or dying batteries can simply fall out of the sky onto the people below. Small drones can smuggle or deliver dangerous and contraband items across borders or into secure facilities like prisons. Camera drones can observe private homes and restricted areas, and can capture classified information from government and military sites, all without the target ever knowing it was being watched.

The long-term effects stretch beyond individual incidents and reach into public trust and policy. If drones are not intercepted, that sets a precedent that the laws are not enforced, which causes greater violations and enables more dangerous activity. Economically, every shutdown, evacuation, and added security layer carries a cost that grows with each new incident. Socially, the constant possibility of being watched from the sky erodes the sense of privacy in public space. Environmentally, falling debris and burned wreckage from countermeasures create their own hazards on the ground. The longer the gap between the growth of the threat and the availability of safe countermeasures, the deeper all of these consequences become.

A critical look at the current landscape shows that the main counter-drone approaches are detection, tracking and early warning; destruction with kinetic weapons such as guns and missiles; electronic jamming; signal intrusion; and camouflage or deception. Detection is necessary but not sufficient, because knowing where a drone is does not remove it. Destruction works in war but is a poor fit near people, because kinetic systems that break the drone create falling debris, and even advanced directed-energy options such as laser systems leave a burning wreck to fall. Jamming and other electronic methods interfere with protected communications and, as the Ukraine war has shown, are becoming less reliable as drones shift to autonomous navigation and fiber-optic control links. In the extreme case, the current best military option against a threatening drone can be a guided missile such as a JAGM, which illustrates how mismatched the tool is to the target when civilians are standing underneath.

The economics make this problem worse. Military drone spending is enormous and growing: Forbes Business Insights estimated the military drone market at $14.14 billion in 2023, projected to reach $47.16 billion by 2032 at roughly 13 percent growth per year, and in 2026 the United States Department of Defense included a dedicated budget for autonomous systems and drones, allocating $9.4 billion for UAV programs within a broader $13.4 billion autonomous systems budget. Almost none of this spending reaches the local police department or the stadium security team. Commercial net-capture interceptors do exist and do work: the Fortem Technologies DroneHunter 5.0 flies at about 130 km/h, uses onboard radar and AI tracking, tows small drones away or lowers larger ones under a parachute, and reports an 85 percent success rate. But at roughly $100,000 per unit, such systems are out of reach for most civilian users, and their technology is proprietary, which blocks independent review and local adaptation.

This points to the most promising area for intervention: net capture, done cheaply and openly. Net-based interception has clear advantages over every destructive or electronic method. It is protocol agnostic, meaning any drone can be caught regardless of its hardware, software, or frequency. It preserves the drone, which is good for evidence and conviction, and allows the aircraft to be examined or reverse engineered. It produces no debris, no drone falling out of the sky, and no electromagnetic interference. Its weaknesses are real but manageable: range is limited by the interceptor's own flight capability, one interceptor usually handles one target, and cost can climb if the system is overbuilt.

Recent academic work shows the concept can be pushed much further down the cost curve. One study optimized a ground-launched net system entirely in simulation, finding the best combinations of launch angle, launch speed, and block mass for coverage and hang time. Another built and field-tested a drone-carried hexagonal Kevlar net, showing over 80 percent agreement between simulation and experiment across deployment, collision, and entanglement. A third, from the University at Buffalo, designed and tested a complete pneumatic net launcher for a hunter drone using PVC pipe, a modified sprinkler valve, 3D-printed parts, and nylon baseball netting, at a total material cost under $50 and a mass of 0.80 kg, which is comparable to a common camera payload. The battlefield has already validated the physics: in Ukraine, meshes and nets are already used as physical armor against FPV strike drones, and in November 2024 Russian forces used a net capture system to neutralize several Ukrainian drones.

The remaining gaps are clear. First, there is no low-cost, open, civilian-legal interceptor that combines detection, tracking, and non-destructive capture in one package. Second, the authority structure restricts mitigation, so even capable non-federal users cannot act, which argues for systems that are inherently safe, such as ones that catch rather than destroy. Third, the research literature on net deployment is small compared to the need, and much of it still relies on simplified models that do not fully match reality. Each of these is an area where a small, motivated group can contribute: by building and testing an affordable net-capture drone, by publishing performance data openly, and by demonstrating a system safe enough for regulators to authorize beyond federal agencies.

This paper examined the problem of unauthorized low, slow, and small drones and the lack of good ways to stop them. The research shows a problem growing on every axis: drones are cheaper, more capable, and more common every year, violations are rising into the millions, and the countermeasures most available today were designed for war and are unsafe, unreliable, or impractical in civilian settings. History shows the threat evolved from explosive balloons over Venice in 1849 to mass-market quadcopters and battlefield drones, while countermeasures evolved much more slowly and remain mostly destructive or electronic. The affected populations range from citizens under a falling wreck to infrastructure operators and society as a whole, and the root causes of cheap hardware, easy operation, low altitude, and small radar signatures combine into a threat that is expensive to fight with the tools we currently have.

The clearest finding of this analysis is that physical net capture is the most promising direction for safe, affordable counter-drone capability, and that the biggest gap is not the concept but the cost and accessibility of the hardware. Our group believes it can make the most significant impact by designing and building a low-cost net-capture interceptor drone for civilian and law enforcement use, targeting a craft of about 6 kg with a speed near 20 m/s and roughly 30 minutes of flight time, carrying a launcher in the spirit of the under-$50 Buffalo prototype. By keeping the system non-destructive, protocol agnostic, and open, it becomes the kind of tool that law enforcement can actually be authorized to use, that preserves evidence for prosecution, and that protects the people standing under the threat. Safe skies will increasingly depend on exactly this kind of reliable, low-cost, and non-destructive way to remove rogue drones.

Countering Rogue Drones: The rise of Unauthorized Low, Slow, and Small UAVs and the Case for Net-Based Capture