The Design Of Vertical Array Measurement System For Ocean Noise Field

Ocean ambient noise is often considered to be an interference term in ocean resource exploration and underwater acoustic research experiments.It is of great significance to measure and analyze the noise signals of the ocean environment to other underwater acoustic signals.At the same time,ocean ambient noise also contains a wealth of characteristics information of the ocean surface and the water,even the bottom.In this paper,a set of vertical receiving array system for measuring low frequency noise of different water depths is designed by analyzing the demand of ocean ambient noise measurement.The hardware and software functions of the system mainly include three parts: signal conditioning circuit;power supply unit;data acquisition and storage unit.Signal conditioning circuit is mainly to filter the analog differential signal amplification;power supply unit to achieve the entire system of different equipment,different voltage isolation power supply functions and additional necessary functions;data acquisition unit is responsible for collecting the signal after conditioning and storage to the network disk.In the software function to achieve,the system uses LabVIEW in NI cRIO multi-threaded programming,multi-channel data synchronization acquisition function.The requirements of the system for a long time remote operation,is self-contained data acquisition and storage.At the end of this paper,the system simulation circuit part and the whole system are tested and evaluated,and the system is applied to the Yellow Sea and South China Sea in a sea field experiment,access to valuable data,and it is verified that the system can realize the 10 kHz sampling rate continuously and synchronously to acquire the noise signal in the function realization,and the function is stable for more than 50 hours,remote operation and self-contained data storage.