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C4iSR: Joint & Common Equipment

IDEX 2017: Microflown AVISA showcases acoustic shot detection sound solution

24 February 2017

Key Points

  • The AMMS is a passive multi-threat ground sensor that can be used as a standalone or as a networked solution
  • The latest version includes dual satellite navigation antennas, which negate the need for initial orientation before use

Microflown AVISA revealed the latest version of its Acoustic Multi-Mission Sensor (AMMS) acoustic shot detection system at the International Defence Exhibition and Conference (IDEX) 2017 in Abu Dhabi. The AMMS is a passive multi-threat ground sensor that can be used standalone or networked to detect, classify, and localise rocket, artillery, and mortars (RAM) as well as small-arms fire positions. It can be used tactically and for indirect fire training.

The latest version of Microflown AVISA's AMMS showing the two satellite navigation antennas. (Giles Ebbutt)The latest version of Microflown AVISA's AMMS showing the two satellite navigation antennas. (Giles Ebbutt)

The Microflown sensor is based on micro-electromechanical systems (MEMS) and uses the temperature difference in the cross section of two sensitive heated wires to determine the acoustic particle velocity. The Acoustic Vector Sensor (AVS) consists of three sensors and a sound pressure transducer; the amplitude differences across the Microflown sensors provide the direction and elevation of the sound source.

Further algorithms and the additional AVS allow distance to be calculated. The AVS is hemispherical with a diameter of 26.5 cm, a height of 10 cm, weighs 1.7 kg, and has a battery life of one month.

The latest version includes dual satellite navigation antennas, which negate the need for initial orientation before use. The previous version needed to be calibrated against True North to provide the base orientation. The dual satellite antennas perform this automatically and can use the GPS, GLONASS, or BeiDou satellite navigation systems.

The system was shown at IDEX in an integrated package consisting of sensor, battery, and network communications in an assembly weighing less than 5 kg, according to a Microflown representative. With a standard BB2590 battery with a 2 W output this will have an endurance of 4-5 days.

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