Microporous MEMS acoustic array sensor and use method thereof

Abstract

The present invention provides a microporous MEMS acoustic array sensor and a use method thereof. The sensor comprises an MEMS acoustic array, an acoustic signal preprocessor, a microcontroller and a microprocessor connected in order. The MEMS acoustic array comprises multiple MEMS microphones which are in central symmetry and uniform distribution. The acoustic signal preprocessor comprises multiple paths of filters which are correspondingly connected to the MEMS microphones one to one and a multi-channel gain adjustment module which is connected to each filter. The microcontroller comprises an AD conversion module and an anti-false-alarm module which are connected mutually. The microprocessor comprises a target detection module, a signal enhancement module, a classified identification module and a DOA estimation module connected in order. The sensor of the invention has the advantages of low power consumption, a small size and light weight.

Description

technical field [0001] The invention relates to the field of field acoustic target detection and recognition, in particular to a micro-aperture MEMS acoustic array sensor and a method for using the same. Background technique [0002] In the field of acoustic target detection and recognition in the field, microphones have always played an important role. In specific applications, they can be divided into unit microphones and multi-element acoustic arrays to complete tasks such as target detection, parameter estimation, and recognition and classification. Multi-element acoustic array detection technology is an important means of ocean detection, and has formed a special discipline. For field targets, acoustic array or distributed network detection technology is usually used. The detection principle of the two is the same. The distribution of the target signal field and its change with the movement of the target are detected by the spatially distributed microphones, so as to ob...

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Problems solved by technology

[0003] At present, the microphone arrays used in the field of acoustic target detection in the field use electret microphones manufactured by traditional machining technology. The poor precision and poor stability of the machining technology lead to high power consumption, large size, and weight of the sensor. stay high

In this case, the miniaturization design of the acoustic array is difficult to realize, and the performance is poor when working in a complex field environment

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