Acoustic Localization Error Caused by the Blast Shock Wave

ZHANG Liangdong; JIANG Haiyan; JI Jianrong; SU Jianjun

doi:10.15892/j.cnki.djzdxb.2024.06.005

Abstract

Dynamic explosion point localization constitutes a pivotal element in damage assessment. The explosive sound wave, originating from the attenuation of a shock wave, is characterized by supersonic velocity and a defined sphere of influence. Accordingly, the accuracy of explosion point acoustic localization is susceptible to the influence of the explosive shock wave. To explore the impact of the explosive shock wave segment on the acoustic localization outcomes during the explosion point localization process, a wave arrival time-distance model for the attenuation of the shock wave into a sound wave was constructed, predicated on the pressure attenuation law of the explosive shock wave. This model was subsequently integrated into the localization methodology based on the time difference of arrival (TDOA). Utilizing a prototypical arrangement as a case study, the preset explosion point and the acoustic sensor array's position were delineated, and the corresponding wave arrival times were computed. The TDOA-based localization approach was employed to retrodict the position of the explosion point relative to the acoustic sensor array, and the acoustic localization error of the explosion point was ascertained by juxtaposing the retrodicted position with the preset position. Furthermore, by modulating the preset explosion point position and the charge mass, the influence of the explosive shock wave on the acoustic localization error was scrutinized. The research findings suggest that the charge mass and the distance from the explosion center are the predominant factors influencing the localization error. As the scaled distance escalates, the localization error induced by the shock wave exhibits a diminishing trend. When the scaled distance surpasses 18.45, the relative distance error can be mitigated to below 1%. It is anticipated that these findings will serve as a reference for the systematic error correction of explosion point acoustic localization, thereby enhancing the computational precision of explosion point acoustic localization.

Key words： shock wave attenuation; wave arrival time; time-distance model; acoustic localization; error in explosive point localization

Cite this article

ZHANG Liangdong , JIANG Haiyan , JI Jianrong , SU Jianjun . Acoustic Localization Error Caused by the Blast Shock Wave[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2024 , 44(6) : 37 -45 . DOI: 10.15892/j.cnki.djzdxb.2024.06.005

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