Method and device for identifying unmanned aerial vehicles at low altitudes

A multi-sensor system using resonant absorption and scattering wavelengths enhances micro drone detection reliability by correlating acoustic and optical signals, addressing the challenges of size and interference in urban environments.

JP2026522154APending Publication Date: 2026-07-07ANTSELEVICH MIKHAIL ALEKSANDROVICH
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
ANTSELEVICH MIKHAIL ALEKSANDROVICH
Filing Date
2024-07-02
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The detection of micro drones in urban environments is challenging due to their small size, low reflectivity, and interference from urban structures, making conventional radar and acoustic sensors unreliable and susceptible to external noise.

Method used

A multi-sensor system utilizing passive optical and acoustic channels, combined with active radar and acoustic sensors operating at resonant absorption and scattering wavelengths, to detect micro drones within a limited range of 100 meters, minimizing interference and enhancing detection reliability.

Benefits of technology

The system provides reliable and secure detection of micro drones by correlating acoustic and optical signals from their propellers, while using atmospheric absorption to limit detection range and reduce interference, ensuring effective detection in urban areas.

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Abstract

Methods and devices for detecting low-altitude unmanned micro aircraft (UAVs) are described. The method includes recording the mechanical vibrations of an electric motor and those acoustic signals caused by the rotation of the propeller. The method - Further, an optical signal is recorded in the visible (0.4 - 0.76 μm) and / or infrared (0.76 μm - 1 mm) range of the UAV, - The occurrence of parametric modulation of the optical signal caused by these same mechanical vibrations is detected, - The correlation between the acoustic signal and the optical signal of the UAV is registered, the presence of which indicates the detection of the UAV, and is characterized by this. The device - A passive acoustic sensor (2), - A passive optical sensor (4), - A correlator (3), - An active acoustic sensor (5) adjusted to operate at the wavelength of resonant scattering of sound waves on the UAV in the frequency range of 10 - 20 kHz, - An active radar sensor (6) that operates at a wavelength corresponding to the wavelength of resonant absorption of signals in the atmosphere within the range (1 mm - 15 mm) and detects the UAV at a flight altitude of 5 m - 50 m is provided.
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