Of Sound Source Localization Based On Microphone Array And Applied Research

The development trend of infrasound source monitoring array and arraysignal processing technology is towards to multi-sensor array, multi array datafusion, the broad-band detection, acoustic imaging showing the sound sourcespatial information, as well as the use of the target signal enhancement means toextract target signal and locate accurately, etc.. The analysis combinedinfrasound source signal detected by the sensor array with the correspondingalgorithm allows us to see the sound field and precise location of sound source,from which we can analyze the correlation between infrasound signal associatesand certain events(such as dam spillway, earthquakes, mudslides). The papersummarizes current status of research on the sensor array and acoustic sourcelocalization, discussing the key problem about sound source localization basedon sensor array and making some research.The paper briefly introduces the infrasound propagation characteristics andthe impact factors of infrasound propagation; Three main sound locationalgorithms are summarized, focusing on the time delay estimation algorithm andbeamforming algorithm for sound source localization. In the correlationalgorithm delay estimation process, the random interference of the instrumentsself-noise and the external environment noise can cause many outliers in thedelay calculated by the correlation calculation results, which results in greatinterference to the infrasound source orientation and acoustic velocity, and evennot identifying the real sound source. The paper presents multiple arraystatistical orientation method based on cross-correlation time delay estimationalgorithm. The method analyzes the direction of wave using statistical analysismethod, multiple array and statistical histogram of directional error in order topositioning infrasound source accurately the wave direction and realize the goalof strengthening effect;In the process of each sub-array calculating delay, thepaper calculates the effective time delay through the normal model range toexclude outliers. That is effective distinction between interference informationand infrasound delay between each sensor. In addition, based on the speed valuecalculated by time delay algorithm, the beamforming algorithm is used to realize sound source visualization on space. The comprehensive sonogram cantell us the target sound source position.The paper introduces infrasound monitoring system hardware structure andits basic working principle, which is applied to dam infrasound measurementstudy. According to the actual conditions, we put infrasound source monitoringarray to monitor infrasound generated by dam spillway source. By analyzingfrequency spectrum, filtering, dividing frequency band processing of the signalobtained by sensor array and using multiple array statistical orientation method,acoustic imaging method, infrasound source can be located. That is the positionof infrasound source which is in the dam area.