BONUS (munition)

BONUS (munition)
Name	BONUS anti-armor submunition
Type	Artillery-dispensed anti-armor submunition
Origin	Sweden
Service	1994–present
Used by	Swedish Army, Polish Land Forces, Portuguese Army
Designer	Bofors
Manufacturer	Bofors Defence, Saab AB
Production date	1994–2015
Weight	15 kg (each submunition)
Length	0.6 m
Diameter	0.22 m
Guidance	infrared and millimetre-wave radar seeker
Filling	tandem shaped charge
Detonation	impact or proximity

BONUS (munition) is a Swedish-designed artillery-delivered anti-armor sensor-fuzed submunition intended to engage modern main battle tanks, armored personnel carriers, and mechanized vehicles. Developed in the late Cold War and fielded in the 1990s, it combines inertial navigation, multi-mode seekers, and tandem warhead technology to defeat reactive and composite armor. The system was integrated with 155 mm artillery projectiles and became notable for networked battlefield sensing, integration with NATO-standard munitions, and influence on subsequent sensor-fuzed weapon programs.

Development and Design

The program began as a collaboration between Försvarets Materielverk requirements and industrial design by Bofors, later consolidated under Saab AB after corporate realignment. Early trials referenced operational analyses from NATO doctrines and lessons from the Gulf War (1990–1991), prompting emphasis on defeating Explosive Reactive Armor and addressing threats identified by the British Army and French Army. Development phases involved instrumented firings at test ranges such as the Vidsel Test Range and modeling with data from Forsmark simulations. Industrial partners included electronics firms with ties to Ericsson and sensor specialists formerly associated with FMC Technologies and ABB. Design constraints were influenced by export controls under Swedish arms policy and acquisition frameworks used by procurement offices in Poland and Portugal.

Specifications

Each submunition contains a dual-mode seeker combining passive infrared sensors similar to those used in Hellfire derivatives and active millimetre-wave radar heritage traceable to work by Selex ES engineers. The warhead is a tandem shaped charge concept inspired by research at Royal Ordnance and DARPA-sponsored anti-armor studies. The dispenser fits inside a 155 mm artillery shell compatible with M982 Excalibur-sized chambers and interacts with fire-control systems used by NATO Artillery units. Mass, dimensions, and arming distances were validated during acceptance trials at ranges used by US Army Test and Evaluation Command observers and representatives from the German Bundeswehr. Submunition survivability in storage referenced standards from STANAG protocols.

Operation and Guidance

Upon artillery launch, an ejectable canister deploys multiple sensor-fuzed submunitions at a pre-programmed dispense altitude informed by ballistic computer inputs and trajectory data exchanged with systems used by Fire Support Coordination Centers in exercises with the United States Marine Corps and French Air and Space Force units. Each submunition descends on a stabilized parachute or decelerator, activating inertial navigation units developed with technology lineage from Honeywell components and seeker acquisition routines comparable to those in AGM-65 Maverick upgrades. The dual-mode seeker scans for thermal signatures and radar cross-sections matching profiles associated with M1 Abrams, Leopard 2, T-72, and T-90 families. Once a target is classified, a kinetic actuator positions the warhead for optimum standoff before detonation; comparator algorithms were bench-tested against datasets from Jane's Information Group archives.

Deployment and Combat Use

Operational deployment occurred with the Swedish Army during exercises with NATO Partnership for Peace members; export customers included Poland and Portugal which integrated the system into 155 mm batteries alongside platforms such as the FH77B and M109 Paladin. Training and doctrinal updates referenced joint-fire procedures used in multinational deployments like KFOR and simulations based on scenarios from the Visegrád Group defense cooperation. Combat use has been reported in limited scenarios and trials; effectiveness assessments examined kill-probability matrices akin to analyses produced by the RAND Corporation and battlefield reports reviewed by think tanks such as the International Institute for Strategic Studies.

Variants and Upgrades

Variants included baseline submunitions and modified seekers with improved signal processing developed by teams formerly associated with Saab Dynamics and subcontractors linked to Thales Group. Upgrades targeted countermeasures resistance, improved arming safety derived from MIL-STD practices, and compatibility with course-correcting fuzes similar to concepts in the Excalibur program. Proposed integrations contemplated networking with battlefield management systems like BMS solutions used by British Army brigades and data links employed in NATO AGS experiments.

Operators and Procurement

Operators approved for procurement included the Swedish Armed Forces, Polish Land Forces, and the Portuguese Army; acquisition decisions referenced procurement frameworks in the European Defence Agency and bilateral procurement agreements with Saab AB. Export controls and offset arrangements were negotiated with ministries such as the Ministry of Defence (Sweden) and counterpart agencies in Poland and Portugal. Training packages were provided in collaboration with artillery schools such as the United States Army Field Artillery School and the Royal School of Artillery.

Countermeasures and Survivability

Countermeasures studied by research groups at institutions like FOI (Swedish Defence Research Agency) included signature suppression techniques, active protection systems exemplified by Trophy (countermeasure), and electronic counter-countermeasures similar to approaches advocated by RAND Corporation analyses. Survivability assessments examined degradation due to environmental exposure in trials at the Arctic Test Centre and compliance with storage safety standards referenced by NATO Standardization Office. Future mitigation arms-race dynamics considered proliferation issues discussed in forums such as the United Nations Disarmament Commission and analyses from Stockholm International Peace Research Institute.

Category:Anti-tank weapons