Rotorcraft early-warning device and method

Abstract

A rotorcraft early-warning device comprises a plurality of sound processing modules (1) and a positioning processing module (2); abnormal end point detection modules (5) are used for judging one of a sound short time average amplitude and a sound short time zero-crossing rate which exceed a threshold as abnormal sounds; the positioning processing module (2) comprises a time delay calculating unit (9) used for calculating a time delay difference that signals of the same sound source reach two sound processing modules (1), an angle calculating unit (10) used for determining a sound source directional angle according to the time delay difference and a geometrical relationship among intervals of the sound processing modules and a sound source positioning unit (11) used for positioning a sound source through combination of multiple groups of sound processing modules; the sound source positioning unit (11) is used for clustering according to an azimuth angle theta, selecting a sound source azimuth angle theta judged by two groups of sound processing modules with highest noise power after clustering as a final sound source direction, displaying the sound source position on an electronic map and giving an alarm.

Description

technical field [0001] The invention belongs to the field of aircraft early warning, in particular to the early warning of unmanned aircraft, and in particular to a rotorcraft early warning device and an early warning method. Background technique [0002] The current rotorcraft has begun to widely intervene in the daily life of the masses. Because the rotorcraft can take off and land straight up and down, and can hover in the air, the flight is more flexible. Compared with the traditional fixed-wing aircraft, the rotorcraft has its own characteristics and has been widely used. The existing regulations are not perfect for flight management in the field of general aviation, but for rotorcraft that fly at low altitudes and are often within the visual range, the current supervision is still blank. [0003] Although the rotorcraft has begun to give consumers a new experience in aerial photography, logistics, patrol, etc., and has a wide range of application prospects, but at the...

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Problems solved by technology

[0008] The inventor of the present application has noticed that in order to generate enough thrust for a multi-rotor UAV, the motor and blades need to rotate at a very high speed, and this high-speed rotation will bring continuous low-frequency start-up noise, which is a common feature of any multi-rotor UAV. Features that even machines cannot avoid

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