Loitering_munition

Loitering munition

Loitering munition

Type of guided unmanned aerial vehicle

Not to be confused with Unmanned combat aerial vehicle.

A loitering munition, also known as a suicide drone,[1][2][3][4] kamikaze drone,[5][6][7] or exploding drone,[8] is a weapon with a warhead that is typically designed to loiter until a target is designated, then crash into it.[9][10][11] They enable attacks against hidden targets that emerge for short periods without placing high-value platforms near the target area. Unlike many other types of munitions, their attacks can be changed mid-mission or aborted. Loitering munitions are typically aerial platforms, but include some autonomous undersea vehicles with similar characteristics.[12]

Loitering weapons emerged in the 1980s for the Suppression of Enemy Air Defenses (SEAD) role, and were deployed for SEAD by some military forces in the 1990s. In the 2000s, they were developed for additional roles, from long-range strikes and fire support to short-range tactical systems that fit in a backpack.

History

First development and terminology

Northrop AGM-136 Tacit Rainbow on display at the National Museum of the U.S. Air Force in Dayton, Ohio.

Initially, loitering munitions were not referred to as such but rather as "suicide UAVs" or "loitering missiles". Different sources point at different projects as originating the weapon category. The failed US AGM-136 Tacit Rainbow program[13][14] or the 1980s initial Israeli Delilah variants[15][16] are mentioned by some sources.[17] The Iranian Ababil-1 was produced in the 1980s but its exact production date is unknown.[18] The Israeli IAI Harpy was produced in the late 1980s.[17]

IAI Harpy first-generation loitering munition for SEAD role

Early projects did not use the "loitering munition" nomenclature, which emerged much later; they used terminology existing at the time. For instance the AGM-136 Tacit Rainbow was described in a 1988 article:

the Tacit Rainbow unmanned jet aircraft being developed by Northrop to loiter on high and then swoop down on enemy radars could be called a UAV, a cruise missile, or even a standoff weapon. But it is most definitely not an RPV.

— Canan, James W. "Unmanned Aerial Vehicles." Air Force Magazine (1988), page 87

Initial role in suppression of enemy air defense

Loitering Munitions HERO (UVision Air Ltd, Israel), DSEI 2019, London.

In response to the first generation of fixed-installation surface-to-air missiles (SAMs) such as S-75 and S-125, the U.S. military developed SEAD doctrine and Wild Weasel weapons, including anti-radiation missiles (ARMs) such as AGM-45 Shrike. The Soviet Union countered with mobile SAMs such as 2K12 Kub and intermittent use of radar.[19] In Israel's 1982 Operation Mole Cricket 19, UAVs and air-launched Samson decoys were used over suspected SAM areas to saturate enemy SAMs and to bait them to activate their radar systems, which were then attacked by ARMs.[20][21]

In the 1980s, programs such as the IAI Harpy and AGM-136 Tacit Rainbow integrated anti-radiation sensors into a drone or missile coupled with command and control and loitering capabilities. This allowed the attacking force to put relatively cheap munitions over suspected SAM sites, then attack when the SAM battery was spotted.[22][23][24][25]

Evolution into additional roles

XM501 US prototype capable of launching LAM (loitering attack munition).

Starting in the 2000s, loitering weapons have been developed for additional roles from relatively long-range strikes and fire support[26] to tactical, very-short-range tactical use.[27][28][29][30] In the 2016 Nagorno-Karabakh conflict, an IAI Harop was used against a bus used as a troop transport for Armenian soldiers.[7] The ZALA Lancet and several Shahed drones, including the HESA Shahed 136, have been used by Russia in the Russian invasion of Ukraine, while Ukraine has fielded loitering munitions such as the UJ-25 Skyline and the American-made AeroVironment Switchblade, which is deployed to platoons and fits in a backpack.[citation needed]

During conflicts in the 2010s and 2020s, conventional armies and non-state militants began modifying common commercial racing drones into "FPV loitering munitions" by the attachment of a small explosive, so-named because of the first-person view (FPV) they provide the operator. Explosive ordnance such as an IED, grenade, mortar round or an RPG warhead are fitted to an FPV drone then deployed to aerial bomb tactical targets. FPV drones also allow direct reconnaissance during the drone's strike mission.[31][32]

After the Russian invasion of Ukraine began in 2022, both Russian and Ukrainian forces were producing thousands of FPV drones every month by October 2023, many of which were donated by volunteer groups.[33] Escadrone Pegasus and the Vyriy Drone Molfar are two examples of the low-cost drones that rapidly evolved in 2022–23 during the war.[34] In 2022, the UK Government announced it was providing "hundreds of loitering munitions" to Ukraine.[35] On 9 November 2023, Ukrainian soldiers claimed to have used a civilian-donated FPV drone to destroy a Russian Tor missile system on the Kupiansk front, showcasing the potential cost-effectiveness of fielding such munitions. A Tor missile system costs some $24 million dollars to build, which could buy 14,000 FPV drones.[36][37]

Characteristics

Air-launched Delilah loitering munition, controlled by backseat WSO

Loitering munitions may be as simple as an unmanned aerial vehicle (UAV) with attached explosives that is sent on a potential kamikaze mission, and may even be constructed with commercially available quadcopters with strapped-on explosives.[38]

Purpose-built munitions are more elaborate in flight and control capabilities, warhead size and design, and onboard sensors for locating targets.[39] Some loitering munitions use a human operator to locate targets whereas others, such as IAI Harop, can function autonomously searching and launching attacks without human intervention.[40][41] Another example is UVision HERO solutions – the loitering systems are operated remotely, controlled in real time by a communications system and equipped with an electro-optical camera whose images are received by the command and control station.[42][43]

Some loitering munitions may return and be recovered by the operator if they are unused in an attack and have enough fuel; in particular this is characteristic of UAVs with a secondary explosive capability.[44] Other systems, such as the Delilah[15][45][11] do not have a recovery option and are self-destructed in mission aborts.[citation needed]

Countermeasures

Russia uses ZALA Lancet drones in Ukraine. Since spring 2022 Ukrainian forces have been building cages around their artillery pieces using chain link fencing, wire mesh and even wooden logs as part of the construction. One analyst told Radio Liberty that such cages were "mainly intended to disrupt Russian Lancet munitions."[citation needed] A picture supposedly taken from January 2023 shows the rear half of a Lancet drone that failed to detonate due to such cages. Likewise Ukrainian forces have used inflatable decoys and wooden vehicles, such as HIMARS, to confuse and deceive Lancet drones.[46][47]

Ukrainian soldiers report shooting down Russian drones with sniper rifles.[48] Russian soldiers use electronic warfare to disable or misdirect Ukrainian drones and have reportedly used the Stupor anti-drone rifle, which uses an electromagnetic pulse that disrupts a drone's GPS navigation.[49] A Royal United Services Institute study in 2022 found that Russian Electronic Warfare units, in March and April 2022, knocked out or shot down 90% of Ukrainian drones that they had at the start of the war in February 2022. The main success was in jamming GPS and radio links to the drones.[50]

Both Ukraine and Russia rely on electronic warfare to defeat FPV drones. Such jammers are now used on Ukrainian trenches and vehicles.[51] Russian forces have built jammers that can fit into a backpack.[52] Pocket-size jammers for soldiers were also developed.[53] As of June 2023 Ukraine was losing 5-10,000 drones a month, or 160 per day, according to Ukrainian soldiers.[54]

This has led to Russia creating wire guided FPV drones, similar to a wire-guided missile or even wire-guided torpedoes. Those drones typically have fibre optic cables 5-20 km in length. Such guidance makes the link between operators and FPV drone immune to jamming.[55] It also allows for much faster and better quality updates from the drone, even from locations where radio contact would be poor, and doesn't reveal operator's or drone's location by radio signals.[56][57] They also need less power to communicate, and so can be used to idle on the ground for ambushes.[58] They have reduced range, payload and manoeuvrability compared to wireless drones,[59][60] although in practice, range and agility of the wired drones can be even higher than those of the radio-controlled ones, given their reduced control latency and increased surviability.[61] Ukraine has also responded by using autonomous drones tasking to ensure that a jammed drone can hit a target. In March 2024 footage put on social media showed a Ukrainian FPV drone being jammed just before it struck a target. Despite the loss of operator control it still managed to strike the target.[62]

Russian tanks have been fitted with rooftop slat armor at the beginning of the Russian invasion of Ukraine which could provide protection against loitering munitions in some circumstances. Some Ukrainian tanks taking part in the 2023 Ukrainian counteroffensive were also spotted using roof screens.[63][64][65]

On 21 March 2024, recent footage of the submarine Tula showed that it has been fitted with a slat armor to prevent drone strikes, the first ocean-going asset to carry such a modification.[66]

Comparison to similar weapons

Loitering munitions fit in the niche between cruise missiles and unmanned combat aerial vehicles (UCAVs).[11][67]

The following table compares similar size-class cruise missiles, loitering munitions, and UCAVS:[citation needed]

More information Characteristic, Cruise missile ...

Whereas some cruise missiles, such as the Block IV Tomahawk, have the ability to loiter and have some sensory and remote control features,[70] their primary mission is typically strike and not target acquisition. Cruise missiles, as their name implies, are optimized for long-range flight at constant speed both in terms of propulsion systems and wings or lifting body design. They are often unable to loiter at slow fuel-efficient speeds which significantly reduces potential loiter time even when the missile has some loiter capabilities.[71]

Conversely almost any UAV could be piloted to crash onto a target and most could be fitted with an improvised explosive warhead.[38] However the primary use of a UAV or UCAV would be for recoverable flight operations carrying reconnaissance equipment and/or munitions. While many UAVs are explicitly designed with loitering in mind, they are not optimized for a diving attack, often lacking forward facing cameras, lacking in control response-speed which is unneeded in regular UAV flight, and are noisy when diving, potentially providing warning to the target. UAV's, being designed as multi-use platforms, often have a unit cost that is not appropriate for regular one-time expendable mission use.[72][67]

NCSIST Chien Hsiang, an example of an expendable loitering munition

The primary mission of a loitering munition is reaching the suspected target area, target acquisition during a loitering phase, followed by a self-destructive strike, and the munition is optimized in this regard in terms of characteristics (e.g. very short engine lifetime, silence in strike phase, speed of strike dive, optimization toward loitering time instead of range/speed) and unit cost (appropriate for a one-off strike mission).[73][74]

Ethical and international humanitarian law concerns

Main article: Lethal autonomous weapon § Ethical and legal issues

Loitering munitions that can make autonomous attack decisions (man out of the loop) raise moral, ethical, and international humanitarian law concerns because a human being is not involved in the decision to attack and potentially kill humans. A distinction is often drawn with fire-and-forget missiles in common use since the 1960s, which may lock-on after launch or be sensor-fuzed, but whose flight time is typically limited and a human launches them at an area where enemy activity is strongly suspected. An autonomous loitering munition, on the other hand, may be launched at an area where enemy activity is only probable, and loiter searching autonomously for targets for hours after the initial launch decision, though it may be able to request final authorization for an attack from a human. The IAI Harpy and IAI Harop are frequently cited as aerial systems that set a precedent in this way—though some note that naval mines also loiter and may kill indiscriminately.[75][76][77][78][79][80]

Users and producers

As of 2023, loitering munitions are used by the armed forces of several countries, including:

North Korea

In March 2025, North Korean state media said leader Kim Jong Un oversaw testing of AI-equipped reconnaissance and suicide drones produced by the country's Unmanned Aerial Technology Complex, inspected a new reconnaissance drone and an early warning and control (AEW) aircraft, and pushed to expand the production of unmanned systems, citing their importance in modern warfare.[156]

See also

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