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Institute of Metal Sciences, Bulgaria
was the prototype anti-helicopter mine designed to operate against
low flying helicopters. The 90 kg mine is activated by specific
targets, identified by acoustic and radar Doppler shift signatures.
The acoustic sensor can identify targets at a range of 500 meters.
The Doppler sensor can measure the target range, at distances up to
150 meters, activating the mine at a distance of of 100 m from the
target. The mine uses two warheads, an explosive formed projectile
and augmented by a second TNT bar charge distributing 17kg of steel
ball fragments. The mine can be activated for periods up to 30 days.
The mine is placed on a stand permitting general orientation of the
sensors and charges in the direction of potential threat. The
control unit uses a signal processor to process the acoustic signals
and determine activation parameters. Activation, neutralization and
explosion by Radio control from a range of up to 2,000 meters is
optional in model AHM-200-1RC. The mine will explode when attempts
for moving, tampering or disassembly during its activation phase.
is a modified version of the original anti-helicopter mine, under
development at the Institute of Metal Sciences in Sofia, Bulgaria.
This version weighs 90 kg, but uses a larger, 23.5 kg load of cubic
steel fragments, rather than steel balls used in the basic model. It
uses a different type of an explosive formed projectile, believed to
incorporate up to five sub-charges.
The institute is developing a new concept concept of a distributed
anti-helicopter mine designated 4AHM-100. This new weapon will
consist of 4 vertical, surface laying charges positioned in an array
to effectively cover an area of approximately 0.4 square kilometer.
Each charge creates a fragmentation cone maintaining effective
lethality up to 100 meters. The total system weighs 125 kg and can
be operated continuously for up to 90 days. The array uses four
charges linked to a centrally located sensor and control unit.
Unlike previous models, these warheads are placed horizontally on
the ground enabling effective concealment. As previous models, the
sensor uses acoustic and Doppler radar sensors for target
identification, ranging and activation. However, this system uses
more sophisticated digital signal processor which can identify
specific types of helicopters, based on customer specific threat