IN Brief:
- Australia wants a very short range defence layer against uncrewed aircraft and uncrewed surface vessels for Hunter frigates.
- The emerging requirement calls for detection of potential targets at around five kilometres.
- No supplier, effector, contract value, procurement quantity, or final installation architecture has been disclosed.
Australia is seeking a very short range air and surface defence capability for its future Hunter class frigates, adding a close protection requirement intended to detect and defeat uncrewed aircraft and uncrewed surface vessels operating near the ship.
The emerging requirement calls for potential targets to be detected at around five kilometres before the system deals with those assessed as threats. No supplier, effector, contract value, procurement quantity, or final installation architecture has been disclosed, so the work remains an acquisition and integration requirement rather than a selected weapon programme.
BAE Systems Maritime Australia is building six Hunter class frigates under SEA 5000 Phase 1 at the Osborne Naval Shipyard in South Australia. Based on the Type 26 Global Combat Ship design, the Australian vessels are configured primarily for anti-submarine warfare and combine the Australian Baseline 9 combat system with CEAFAR2 radar, sonar, Mk 41 vertical launch capability, and other locally specified equipment.
A dedicated counter-UAS and counter-USV layer would sit below the frigate’s longer range sensors and guided weapons. The engineering problem is therefore wider than selecting an interceptor with sufficient range. Any solution has to fit into a ship already carrying a dense combat system architecture while providing enough warning and engagement time against small targets that may be difficult to detect and classify close to the hull.
A five-kilometre detection requirement leaves a short decision cycle. A small aerial or surface target can cover that distance quickly, so the ship has limited time to establish a track, classify the contact, determine whether it is hostile, assign an effector, and complete an engagement. False alarms also carry a cost because close-range weapons and electronic countermeasures cannot be employed casually around friendly aircraft, boats, ports, or other shipping.
Covering threats in both the air and on the sea surface complicates the sensing task. Small drones can present limited radar cross-section and operate against cluttered backgrounds, while low-profile surface craft can be obscured by sea state and coastal returns. Australia has not disclosed whether the eventual system will rely on radar, electro-optical sensing, electronic support, or a combination of sensors, and the five-kilometre requirement alone does not define that architecture.
The choice of effector is equally open. Guns, guided missiles, electronic attack, directed energy, and other counter-drone technologies impose different demands on deck space, magazines, electrical power, cooling, data interfaces, and safe operating arcs. A system that performs well in a land installation may require significant redesign before it can survive saltwater exposure, ship motion, electromagnetic constraints, and the maintenance routines of a frigate.
Those questions arrive while the Hunter programme is already moving through production. The first ship reached keel laying at Osborne in August, and the first three vessels are covered by the current construction contract. The build has also moved deeper into supplier delivery, including an $83 million insulation package for the first three frigates that requires CBG Systems to establish workshop and delivery capacity at Osborne.
The same production discipline applies more sharply to a new combat capability. A counter-drone system can affect topside arrangement, weight, power, cooling, software, cabling, electromagnetic compatibility, and access for maintenance. Changes introduced after a ship’s baseline has matured can be more expensive than the equipment itself if structural or combat system interfaces have to be reopened.
Hunter’s Type 26-derived design does provide scope for through-life adaptation. BAE Systems describes the ships as using modular digital design and open systems architecture to support upgrades as technology changes. The programme also includes a mission bay intended for uncrewed systems and other payloads, although that does not mean the counter-drone requirement can be added without detailed engineering.
The operational logic is straightforward. A high-value frigate equipped with long-range missiles needs a proportionate response to smaller, cheaper threats that may arrive in numbers or approach from several directions. Using an expensive area-defence missile against every small drone is unattractive, while leaving the final few kilometres of the defensive envelope to existing guns or soft-kill systems may not cover the full threat set.
Australia has not yet indicated which mix of sensing and effect it wants, and no supplier should be treated as selected on the basis of the requirement alone. The next material step will be a procurement decision that turns the five-kilometre performance requirement into a defined architecture. At that point, the Hunter programme will have to absorb not only another weapon or sensor, but another set of interfaces competing for space, power, software attention, and integration time inside a ship already in production.
