Implementation method for direction of arrival estimation system based on smartphone sound array

Abstract

The invention discloses an implementation method for a direction of arrival estimation system based on a smartphone sound array. The method comprises the following steps of firstly, deploying n mobile phones to a linear array at fixed intervals, establishing network communication and measuring a distance between the mobile phones; secondly, when a target sends a sound signal, simultaneously opening microphones of all n mobile phones and starting to record an audio signal of a target sound source; thirdly, closing the microphones after chirp signals which are played based on the mobile phones are recorded; fourthly, adopting a generalized cross correlation method to detect a time of arrival of the respective chirp signal in n segments of recorded audio signals; fifthly, synchronizing n segments of target sound source signals recorded by n mobile phones; and lastly, adopting an array signal processing method to carry out direction of arrival estimation on the audio signals of n segments of target sound source signals after synchronization in order to estimate an azimuth angle of the target. The method has the characteristics of easy and quick deployment, low cost and high precision of direction of arrival estimation and has wide application prospect in the fields of low-altitude unmanned aerial vehicle detection, field rescue and the like.

Description

technical field [0001] The invention relates to an acoustic array system for estimating the angle of arrival, in particular to a method for realizing the estimation system for the angle of arrival based on the acoustic array of a smart phone. Background technique [0002] In recent years, with the development of society and the advancement of science and technology, people have more and more demands for accurate location information, and the research on positioning technology has received extensive attention. As a kind of information that is easy to obtain in daily life, acoustic signal is becoming a research hotspot in positioning technology. As an important branch of acoustic signal localization technology, microphone-based acoustic array technology is our research focus. At present, high-quality customized acoustic array equipment has achieved high accuracy in angle estimation, but due to its high production cost, difficult and slow deployment, it is difficult to quickly...

AI Technical Summary

Problems solved by technology

At present, some scholars have conducted in-depth research on it. Aiming at the key issue of mobile phone arrays—clock synchronization, the problem of clock asynchrony between smart phones can be solved by modifying the kernel and drivers of smart phone arrays with operating systems. The kernel and driver need special technology to modify, which is not easy to operate at the user level and lacks universality

Images