International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The task of jamming underwater voice communications with and between divers and communications with / between autonomous submarines in port security systems and coastal infrastructure facilities as well as anchored ships plays an important role in operations against asymmetric and military threats. Underwater jammers can be classified as autonomous, with remote control via hydro acoustic channel and with cable control from a shore-based or ship-based base station. While in the first two when receiving hydro acoustic signals above a set threshold level is performed program amplitude-frequency analysis and a decision is made to emit a jamming signal, in coastal / ship performance the decision to activate may be taken by the operator on other signs, which are analyzed in this report.

In constructing the modern sea bottom mines usually seek a compromise between tactical requirements for this type of weapon and requirements for high resistance against possible mine countermeasure-action e.g. make it a cylindrical shape when you need to put an item on the torpedo apparatus submarines, their shell is constructed in the so-called “stealth” technology and is made of non-metallic materials, increasing the quantity of the explosive when the depth of the region is greater, etc. The article proposes an approach that provides a common solution to all these requirements and allows the construction of a highly functional, versatile, high anti-mining resistance sea bottom mine that has no analogue in the naval practice.

To enforce the Republic of Bulgaria’s “Maritime Spaces, Inland Waterways and Ports Act” and EC Decision 2010/477/EU is a need for an underwater monitoring system in the national maritime spaces. As an element of such a system, a prototype of a bottompositioned modular system has been developed at IMS-BAS, designed for reading and recording and transmission of hydro physical, hydro chemical, biological and ecological data for the marine environment, sounds from biological sources and anthropogenic noises, registration and classification of a sound anomaly, a fragment of it is overwritten wirelessly in an autonomous radio beacon, which quickly floats and transmits the information to a base station on a radio channel, and then acts as a radio marker. One of the radio buoys is connected to the central airtight body by a rope wound on a spool. Its purpose is in case of technical problems or pre-programmed to float and signal on a radio channel. After lifting the station to the surface, the recorded information is taken off and maintained.