Octava Defence

Octava Defence is a Kyiv-based defence-technology firm, part of the wider Octava group founded by Oleksandr Kardakov, that expanded from cybersecurity into physical-threat protection after 2022. Its flagship counter-drone product is FENEK, a passive acoustic detection system built around a seven-microphone array and sound-filtering algorithms. By comparing the time difference of arrival of sound across multiple units, FENEK triangulates incoming threats — reporting cites detection of Shahed-type drones at up to around three kilometres and cruise missiles at up to around five kilometres. Because it is passive, the system is presented as effective against radio-silent fibre-optic drones that evade electronic-warfare and signals-intelligence sensors.

Octava Defence frames FENEK as one layer of SPHERE, a platform for protecting critical infrastructure that fuses software with radar, optical and acoustic detection into a single air picture. The company’s drone line includes FLYCAT, a GPS-independent loitering munition with an X-shaped wing layout, a reported 12-kilogram take-off weight, roughly 40 kilometres of range and around 40 minutes of endurance, intended to loiter and engage ground targets under jamming using intelligent navigation rather than satellite positioning.

The company has presented its systems at Ukrainian defence-tech showcases including events associated with Brave1 , the state defence-innovation cluster, and at the LANDEURO exhibition in Germany. Coverage notes that Octava Defence’s military work sits alongside other Octava-affiliated ventures under common ownership; reporting attributes the group’s miltech direction to Kardakov.