A-Size Autonomous Underwater Vehicles

Lockheed Martin's A-size Autonomous Underwater Vehicles are sonobuoy-sized AUVs developed for more than 35 years as expendable undersea systems. The family includes EMATT and SUBMATT variants that can be launched from standard sonobuoy launchers on aircraft, submarines, and surface vessels.

Various Conflicts🏳️ Unspecified

A-Size Autonomous Underwater Vehicles, A-size autonomous underwater vehicle family, Naval Systems

Image source: Lockheed Martin A-Size Autonomous Underwater Vehicles

Profile

Origin: United States
Built by: Lockheed Martin
Type: A-size autonomous underwater vehicle family
Service note: Modern undersea training and special-mission family developed over 35+ years
Produced: Early 1980s-present
Variants: EMATT, SUBMATT

aswsubmarinetraininguuv

Specifications

Diameter: 4 7/8 inches (124 mm)
Length: 36 inches (about 0.9 m)
Launch methods: Standard sonobuoy launchers on fixed-wing aircraft, rotary-wing aircraft, submarines, and surface vessels
Role: Expendable ASW training target and small undersea vehicle family
Speed: SUBMATT programmable variable speed from 3 to 8 knots

Service And Conflict Use

Service History

In service: A-size family developed and built for more than 35 years as a sonobuoy-sized undersea vehicle line for training and related missions.

Conflict Usage

Side: 🏳️Unspecified

Exact model: Lockheed Martin A-size Autonomous Underwater Vehicle family. Public sources describe development and production of small A-size AUVs, but I found no confirmed public combat use in an armed conflict.

Named Variants

The family page covers the best-documented A-size vehicles in Lockheed Martin's public catalog.

Variant	Role	Reader note
EMATT	Expendable Mobile ASW Training Target	Built as a low-cost, expendable open-ocean training target for submarine warfare exercises.
SUBMATT	Submarine Mobile Acoustic Training Target	Field-programmable target with digital signal processing, variable speed, and configurable acoustic, depth, and heading changes.

A-Size Autonomous Underwater Vehicles Images

A-Size Autonomous Underwater Vehicles, A-size autonomous underwater vehicle family, Naval Systems - view 1 — Source: Lockheed Martin A-Size Autonomous Underwater Vehicles

A-Size Autonomous Underwater Vehicles, A-size autonomous underwater vehicle family, Naval Systems - view 2 — Source: Lockheed Martin A-Size Autonomous Underwater Vehicles

A-Size Autonomous Underwater Vehicles, A-size autonomous underwater vehicle family, Naval Systems - view 3 — Source: Lockheed Martin A-Size Autonomous Underwater Vehicles

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Sources

Lockheed Martin A-Size Autonomous Underwater VehiclesPublisher: Lockheed Martin | Note: Supports manufacturer background, family description, sonobuoy-sized dimensions, launch methods, and official image provenance. | Accessed: 2026-06-23 EMATT product cardPublisher: Lockheed Martin | Note: Supports EMATT background and the open-ocean training-target role of the family. | Accessed: 2026-06-23 SUBMATT product cardPublisher: Lockheed Martin | Note: Supports SUBMATT background, field programmability, and acoustic and speed characteristics. | Accessed: 2026-06-23 Lockheed Martin undersea featurePublisher: Ocean News & Technology | Note: Supports the early-1980s EMATT production context and the longer A-size development history. | Accessed: 2026-06-23