The Implementation Of Low-power Acoustic Data Storage System And Research On Signal Detection Algorithm

In the field of modern marine scientific research,the analysis of acoustic signals plays an increasing significant role,and the basis of analysis is the acquisition and accumulation of raw underwater acoustic data.In this paper,a low-power storage system of acoustic data is designed,which uses CPLD and MSP432 as the core to expand peripheral function circuits.The part of CPLD is used to realize multi-channel synchronous sampling,and transfer the original data mixed by marine background noises to MSP432,meanwhile unoccupied I/O is reserved for functional expansion according to actual needs.During receiving data,MSP432 manipulates the mixed data with ping-pong technique and stored on an external storage medium.After the device is retrived,preparing to utilize host computer to observe and analyze the raw data for a purpose of low-frequency linear spectrum detection.This paper proposes a two-input cascade linear spectrum enhancer algorithm with variable step,to suppress the noise of the main channel twice and control the noise of the reference channel at the same time,resulting in a better rise about signal-to-noise ratio.Simultaneously variable step is used to iterative filter tap coefficients and speed up the convergence rate,reduce steady-state errors.Meanwhile the system is required to satisfied with miniaturization and low-power consumption,to meet the flexible application of the working environment,and to be used on different types of ocean observation platforms.After the completion of the scheme design,carried out the design of whole system hardware structure and circuit design,hardware debugging and software writing were completed.This system has been tested by offshore field expriment.The actual working performance of the system is consistent with the expected performance parameters.The long-term acquisition of underwater environmental noise and target signal data in the external field test ensures the system's reliability and continuous stability,and has a good engineering application prospect.