Unmanned surface vehicle

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"Autonomous ship" redirects here. Not to be confused with autonomous underwater vehicle.
"Autonomous surface vehicle" redirects here. Not to be confused with unmanned ground vehicle.
Unmanned surface vehicle
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In February 2022, Sunflower Shiretoko sailed autonomously for 750 kilometers.[1]
British RNMB Harrier, an autonomous USV of the Atlas Elektronik ARCIMS mine warfare system (2020)
A passenger USV demonstration at Hampton, Virginia, United States (January 2009)

An unmanned surface vehicle, unmanned surface vessel or uncrewed surface vessel (USV),[2][3] colloquially called a drone boat, drone ship[4] or sea drone, is a boat or ship that operates on the surface of the water without a crew.[5] USVs operate with various levels of autonomy, from remote control[6] to fully autonomous surface vehicles (ASV).[7]

Regulatory environment[edit]

The regulatory environment for USV operations is changing rapidly as the technology develops and is more frequently deployed on commercial projects. The Maritime Autonomous Surface Ship UK Industry Conduct Principles and Code of Practice 2020 (V4)[8] has been prepared by the UK Maritime Autonomous Systems Regulatory Working Group (MASRWG) and published by Maritime UK through the Society of Maritime Industries. Organisations that contributed to the development of the MASS Code of Practice include The Maritime & Coastguard Agency (MCA), Atlas Elektronik UK Ltd, AutoNaut, Fugro, the UK Chamber of Shipping, UKHO, Trinity House, Nautical Institute, National Oceanography Centre, Dynautics Limited, SEA-KIT International, Sagar Defence Engineering and many more.[citation needed]

By the end of 2017, Sagar Defence Engineering became the first company in India to build and supply USV to a Government organization.[citation needed]

Development[edit]

As early as the end of World War II, remote-controlled USVs were used by the US Navy for target drone and minesweeping applications.[9]: 121  In the twenty-first century, advances in USV control systems and navigation technologies have resulted in USVs that an operator can control remotely from land or a nearby vessel:[10] USVs that operate with partially autonomous control, and USVs (ASVs) that operate fully autonomously.[9] Modern applications and research areas for USVs and ASVs include commercial shipping,[11] environmental and climate monitoring, seafloor mapping,[11][12] passenger ferries,[13] robotic research,[14] surveillance, inspection of bridges and other infrastructure,[15] military, and naval operations.[9]

On January 17, 2022, the Soleil succeeded in completing the first fully autonomous sea voyage by ship. Built by MHI, the demonstration was conducted in cooperation of Shin Nihonkai Ferry.[16] The seven-hour, 240-kilometre voyage, from Shinmoji in Northern Kyushu to the Iyonada Sea, recorded a maximum speed of 26 knots.[17]

In August 2022, the MV Mikage of the Mitsui O.S.K. Lines sailed 161-nautical miles over two days, from Tsuruga to Sakai, successfully completing the first crewless sea voyage to include docking of an autonomous coastal container ship, in a two-day trial.[18]

USV autonomy platforms[edit]

A number of autonomy platforms (computer software) tailored specifically for USV operations have been developed. Some are tied to specific vessels, while others are flexible and can be applied to different hull, mechanical, and electrical configurations.

USV autonomy platforms
Name Vendor Type Deployed vessels Vendor bespoke USVs Conversion to USV / OEM COLREGs
Typhoon Satfinder Commercial 2 Yes Yes Capable[19]
ASView L3Harris Commercial 100+[20] Yes Yes[21] Capable[20]
MOOS MIT Open source No Yes (open source) Capable[22]
SM300 Sea Machines Commercial 7 No Yes Capable[23]
SDE Sagar Defence Engineering Private Limited Commercial 7 Yes Yes Capable

Computer-controlled and operated USVs[edit]

The design and build of uncrewed surface vessels (USVs) is complex and challenging. Hundreds of decisions relating to mission goals, payload requirements, power budget, hull design, communication systems and propulsion control and management need to be analysed and implemented. Crewed vessel builders often rely on single-source suppliers for propulsion and instrumentation to help the crew control the vessel. In the case of an uncrewed (or partially crewed) vessel, the builder needs to replace elements of the human interface with a remote human interface.

Technical considerations[edit]

Uncrewed surface vessels vary in size from under 1 metre LOA to 20+ metres, with displacements ranging from a few kilograms to many tonnes, so propulsion systems cover a wide range of power levels, interfaces and technologies.

Interface types (broadly) in order of size/power:

  • PWM-controlled Electronic Speed Controllers for simple electric motors
  • Serial bus, using ASCII-coded commands
  • Serial bus using binary protocols
  • Analogue interfaces found on many larger vessel
  • Proprietary CANbus protocols used by various engine manufacturers
  • Proprietary CANbus protocols used by manufacturers of generic engine controls

While many of these protocols carry demands to the propulsion, most of them do not bring back any status information. Feedback of achieved RPM may come from tacho pulses or from built-in sensors that generate CAN or serial data. Other sensors may be fitted, such as current sensing on electric motors, which can give an indication of power delivered. Safety is a critical concern, especially at high power levels, but even a small propeller can cause damage or injury and the control system needs to be designed with this in mind. This is particularly important in handover protocols for optionally manned boats.

A frequent challenge faced in the control of USVs is the achievement of a smooth response from full astern to full ahead. Crewed vessels usually have a detent behaviour, with a wide deadband around the stop position. To achieve accurate control of differential steering, the control system needs to compensate for this deadband. Internal combustion engines tend to drive through a gearbox, with an inevitable sudden change when the gearbox engages which the control system must take into account. Waterjets are the exception to this, as they adjust smoothly through the zero point. Electric drives often have a similar deadband built in, so again the control system needs to be designed to preserve this behaviour for a man on board, but smooth it out for automatic control, e.g., for low-speed manoeuvring and Dynamic Positioning.

Oceanography, hydrography and environmental monitoring[edit]

USV used in oceanographic research (June 2011)

USVs are valuable in oceanography, as they are more maneuverable than moored or drifting weather buoys, but far cheaper than the equivalent weather ships and research vessels,[3][24] and more flexible than commercial-ship contributions.[3] USVs used in oceanographic research tend to be powered and propelled by renewable energy sources. For example, Wave gliders harness wave energy for primary propulsion,[25] whereas Saildrones and Sailbuoys use wind. Other USVs harness solar energy to power electric motors, such as Data Xplorer; a product of Open Ocean Robotics, and Xocean. Renewable-powered and persistent, ocean-going USVs have solar cells to power their electronics. Renewable-powered USV persistence are typically measured in months.[26]

As late as early 2022, USVs had been predominantly used for environmental monitoring and hydrographic survey[3] and future uptake was projected to be likely to grow in monitoring and surveillance of very remote locations due to their potential for multidisciplinary use.[3] Low operational cost has been a consistent driver for USV uptake when compared with crewed vessels.[3] Other drivers for USV uptake have changed through time, including reducing risk to people, spatio-temporal efficiency, endurance, precision and accessing very shallow water.[3]

Non-renewable-powered USVs are a powerful tool for use in commercial hydrographic survey.[14] Using a small USV in parallel to traditional survey vessels as a 'force-multiplier' can double survey coverage and reduce time on-site. This method was used for a survey carried out in the Bering Sea, off Alaska; the ASV Global 'C-Worker 5' autonomous surface vehicle (ASV) collected 2,275 nautical miles of survey, 44% of the project total. This was a first for the survey industry and resulted in a saving of 25 days at sea.[27] In 2020, the British USV Maxlimer completed an unmanned survey of 1,000 square kilometres (390 sq mi) of seafloor in the Atlantic Ocean west of the English Channel.[28]

Saildrone[edit]

This section is about the unmanned surface vehicle. For the company, see Saildrone (company).
A saildrone in Dutch Harbor, Alaska, after the 2019 NOAA Arctic missions

A saildrone is a type of unmanned surface vehicle used primarily in oceans for data collection.[29] Saildrones are wind and solar powered and carry a suite of science sensors and navigational instruments. They can follow a set of remotely prescribed waypoints.[30] The saildrone was invented by Richard Jenkins, a British engineer,[31] founder and CEO of Saildrone, Inc. Saildrones have been used by scientists and research organizations like the National Oceanic and Atmospheric Administration (NOAA) to survey the marine ecosystem, fisheries, and weather.[32][33] In January 2019, a small fleet of saildrones was launched to attempt the first autonomous circumnavigation of Antarctica.[34] One of the saildrones completed the mission, traveling 12,500 miles (20,100 km) over the seven month journey while collecting a detailed data set using on board environmental monitoring instrumentation.[35]

In August 2019, SD 1021 completed the fastest unmanned Atlantic crossing sailing from Bermuda to the UK,[36] and in October, it completed the return trip to become the first autonomous vehicle to cross the Atlantic in both directions.[37] The University of Washington and the Saildrone company began a joint venture in 2019 called The Saildrone Pacific Sentinel Experiment, which positioned six saildrones along the west coast of the United States to gather atmospheric and ocean data.[38][39]

Saildrone and NOAA deployed five modified hurricane-class vessels at key locations in the Atlantic Ocean prior to the June start of the 2021 hurricane season. In September, SD 1045 was in location to obtain video and data from inside Hurricane Sam. It was the first research vessel to ever venture into the middle of a major hurricane.[40][41]

Military applications[edit]

Computer-generated image of a Franco-British MMCM (Maritime Mine Counter Measures) minesweeping drone

The military usage of unmanned ships in the form of a Fire ship dates back to ancient times.

USVs were used militarily as early as the 1920s as remote controlled target craft, following the development of the 'DCB's in World War One. By World War II they were also being used for minesweeper purposes.

Military applications for USVs include powered seaborne targets and minehunting,[42] as well as surveillance and reconnaissance, strike operations, and area denial or sea denial.[43] Various other applications are also being explored. Some commercial USVs may utilize COLREGs-compliant navigation.[20]

In 2016 DARPA launched an anti-submarine USV prototype called Sea Hunter. Turkish firm Aselsan produced ALBATROS-T and ALBATROS-K moving target boats for the Turkish Naval Forces to use in shooting drills.[44][45] Turkey's first indigenously developed armed USV (AUSV) is the ULAQ,[46] developed by Ares Shipyard, Meteksan Defence Systems and Roketsan. ULAQ is armed with 4 Roketsan Cirit and 2 UMTAS. It completed its first firing test successfully on 27 May 2021.[47] The ULAQ can be deployed from combat ships. It can be controlled remotely from mobile vehicles, headquarters, command centers and floating platforms. It will serve in missions such as reconnaissance, surveillance and intelligence, surface warfare, asymmetric warfare, armed escort, force protection, and strategic facility security. Ares Shipyard's CEO says that very different versions of ULAQ equipped with different weapons are under development.[48] Its primary user will be Turkish Naval Forces.

In addition, military applications for medium unmanned surface vessels (MUSVs) include fleet intelligence, surveillance, reconnaissance and electronic warfare. In August 2020, L3Harris Technologies was awarded a contract to build an MUSV prototype, with options for up to nine vessels. L3Harris subcontracted Swiftships, a Louisiana-based shipbuilder, to build the vessels, with displacement of about 500 tons.[49] The prototype is targeted for completion by end of 2022. It is the first unmanned naval platform programme in this class of ships, which will likely play a major role in supporting the Distributed Maritime Operations[50] strategy of the U.S. Navy. Earlier, Swiftships partnered with University of Louisiana in 2014 to build the Anaconda (AN-1) and later the Anaconda (AN-2) class of small USVs.[51]

On 13 April 2022, the US sent unspecified "unmanned coastal defense vessels" to Ukraine amid the 2022 Russian invasion of Ukraine as part of a new security package.[52]

A theory was put forward by the BBC that an unmanned surface vehicle was used in the 2022 Crimean Bridge explosion.[53] After explosions at this bridge in July 2023, Russia's Anti-Terrorist Committee claimed that Ukraine used unmanned surface vehicles to attack the bridge.[54]

In December 2023, Russia unveiled its first kamikaze USV called “Oduvanchik". It is reported that the sea drone can carry up to 600 kg of exlosives, has range of 200 km and speed of 80 km/h. It was developed by Kingisepp Machine-Building Plant.[55]

At a ceremony held on 9 January 2024, TCB Marlin entered servis in the Turkish Naval Forces as the first Armed USV with the hull number TCB-1101 and name Marlin SİDA.[citation needed]

Use in combat[edit]

On 29 October 2022, during the Russian invasion of Ukraine, Ukrainian armed forces made a multi-USV attack on Russian naval vessels at the Sevastopol Naval Base. According to the Russian Defense Ministry, seven USVs were involved in the attack with support of eight UAVs. This event represents the first use of unmanned surface vehicles in naval warfare.[56] Naval News reported that little damage had occurred to either of the two warships that were hit by the small USVs, a Russian frigate and a minesweeper. However, the military effect of the attack on the protected harbor of Sevastopol exceeded the direct damage because it led to the Russian Navy going into a protective mode, "essentially locking them in port. ... New defenses were quickly added, new procedures imposed and there was much less activity. Russia's most powerful warships in the war [were by mid-November] mostly tied up in port."[57] The US Naval Institute reported that, by December 2022, the "Russian Navy now knows it is vulnerable in its main naval base, causing it to retreat further into its shell, increasing defenses and reducing activity outside."[58] A second USV attack occurred in mid-November in Novorossiysk, also in the Black Sea but much further from Russian occupied territory than Sevastopol.[59]

By January 2023, SpaceX restricted the licensing of its Starlink satellite-internet communication technology to commercial use, excluding direct military use on weapon systems. The limitation restricted one use of the USV design used by Ukraine in late 2022. At the same time, Russia increased its capabilities in small explosive USVs which had been used to ram a Ukrainian bridge on 10 February 2023. By February, the new Russian capability with USVs, and the communication restrictions on the previous Ukrainian USVs, could affect the balance in the naval war. In the view of Naval News, "The Black Sea appears to be becoming more Russian friendly again."[60] The potential for wider use of USVs to impact the outcome of the conflict is not settled, however, as both physical constraints on existing technology and emerging counter-USV capabilities may render these vessels vulnerable.[61]

On 4 August 2023, the Olenegorsky Gornyak, a Ropucha-class landing ship was seriously damaged in the Black Sea Novorossiysk naval base after it was struck by a Ukrainian Maritime Drone carrying 450 kilograms of TNT.[62] It was pictured listing heavily to one side while being towed back to port.[63] Some 100 service personnel were onboard at the time.[64]

On 1 February 2024, the Tarantul-III class missile corvette Ivanovets was sunk in the Donuzlav Bay after being attacked by Ukrainian USVs.[65]

On 14 February 2024, the Caesar Kunikov, a Ropucha-class landing ship was sunk off Alupka by Ukrainian HUR MO "Group 13" forces using MAGURA V5 USV.[66][67]

Countermeasures used in combat[edit]

The naval war in the Black Sea during the Russian war on Ukraine has see a number of countermeasures tried against the threat of Ukrainian uncrewed drones.

Due to the drone attack on the Sevastopol Naval Base in October 2022, Russian forces had deployed several early countermeasures. They have trained dolphins to protect the Naval Base, while using various booms or nets to stop further attacks. A main early change by mid-2023 was the use of dazzle camouflage, which according to Reuters is "designed to disguise a ship's heading and speed at sea — aims to confuse modern operators of suicide drones and satellites and prevent them from easily identifying important ships", while gunfire from helicopters can be used to destroy Ukrainian drones during an attack.[68][69]

By December 2023, the Russian effort to counter Ukrainian USVs in the Black Sea had expanded to include:[70]

  • formal dedicated anti-drone helicopter aviation units have been formed in Crimea to engage attacking USVs with unguided rockets and machine guns, using Mi-8 Hip and Ka-27 Helix helicopters. More occasionally, Sukhoi Su-27 Flanker fighter jets have been used.
  • electromagnetic noise countermeasures have been tried to jam communications of offensive USV drones.
  • escort ships have been used for high-value targets. Russia has recently begun to escort high-value weapon transport ships and tankers; escorts are typically frigates or patrol ships. The "convoys have been targeted by USVs on several occasions, with the escorts facing the brunt of the attacks."[70]
  • Russia has tested flying an FPV drone from a patrol boat into a fixed target. Use in naval combat had not yet been reported by December 2023.

By January 2024, Russian countermeasures had become increasingly capable and the Ukrainian Navy indicated that some offensive USV "tactics that were worked out in 2022 and 2023 will not work in 2024." and that this military reality was driving change on the Ukrainian side. Ukraine is developing autonomous underwater vehicles (AUVs) to increase offensive capability against improved Russian USV defenses.[71]

On 1 February 2024, the Russian corvette Ivanovets was sunk by drones.[72][73][74][75]

Strategic studies[edit]

An emerging field of research examines whether the proliferation of unmanned surface vessels can impact crisis dynamics or intra-war escalation. An exploratory report on the subject from the Center for Naval Analyses suggests seven potential concerns for military competition, including accidental, deliberate, and inadvertent escalation.[76] While recent scholarship has examined the impact of unmanned aerial systems on crisis management, the empirical record for unmanned surface and subsurface systems is thinner, since these technologies have not yet been widely employed.[77] According to an article published by Reuters, these drones are manufactured at a cost of $250,000 each. They use two impact detonator taken from Russian bombs. With a length of 5.5 metres, they have a camera to allow a human to operate them, and use a water jet for propulsion with a maximum speed of 80 kilometres per hour and an endurance of 60 hours. Given their relative low cost, compared to missiles or bombs, they can be deployed in a mass attack. Their low profile also makes them harder to hit.[68]

Cargo[edit]

Main article: Autonomous cargo ship

In the future, many unmanned cargo ships are expected to cross the waters.[78] In November 2021, the first autonomous cargo ship, MV Yara Birkeland was launched in Norway. The fully electric ship is expected to substantially reduce the need for truck journeys.[79]

Urban vessels and small-scale logistics[edit]

In 2021, the world's first urban autonomous vessels, Roboats, were deployed in the canals of Amsterdam, Netherlands. The ships developed by three institutions could carry up to five people, collect waste, deliver goods, monitor the environment and provide "on-demand infrastructure".[80][81][needs update]

Seaweed farming[edit]

Unmanned surface vehicles can also assist in seaweed farming and help to reduce operating costs.[82][83]

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