Low-altitude unmanned aerial vehicle sound source direction detection system

Abstract

The invention discloses a low-altitude unmanned aerial vehicle sound source direction detection system, which comprises a microphone array, a programmable processing board, a computer and a power supply. The microphone array comprises four microphones. The four microphones are fixed to a rotation base through four telescoping rods respectively, and by rotating and stretching the telescoping rods, different microphone arrays in different geometric structures and different sizes can be constructed to detect flight audio data of an unmanned aerial vehicle and transmit the collected four-channel audio data to the programmable processing board; the programmable processing board carries out filtering, amplification, impedance transformation and AD conversion on the four-channel audio data, and then, transmits the processed audio data to the computer; the computer calculates direction information of the unmanned aerial vehicle according to the received audio data; and the power supply is used for providing power for the microphone array and the programmable processing board. The system is compact in structure, low in cost and convenient to carry, install and realize batch production; and the system is high in angle positioning accuracy and good in operating distance.

Description

technical field [0001] The invention relates to an embedded acoustic signal acquisition technology, in particular to a low-altitude unmanned aerial vehicle sound source azimuth detection system. Background technique [0002] In recent years, low-altitude unmanned aerial vehicles have rapidly become popular among the people because of their low cost and easy operation, and the number has increased sharply. However, there is currently no license management for small low-altitude unmanned aerial vehicles with a payload of less than 7kg and a flight altitude of only tens of meters to 200 meters. Luo Hongwei pointed out in the article on the prevention and disposal of "low, slow and small" targets in the security work of large-scale activities that due to the lack of effective supervision, there are often crimes such as using unmanned aerial vehicles to carry out various terrorist activities, espionage activities, and illegal intrusions. In a densely populated urban environment,...

AI Technical Summary

Problems solved by technology

However, the acoustic low-altitude detection systems currently being developed in my country are mostly military or civil aviation backgrounds. They cover different airspaces and detection targets, and are large in size and high in cost. to promote

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