The Study Of Underwater Acoustic Signal Recorded With Large Dynamic Range

Underwater acoustic signal is an important reference data for studying ocean information.The research and application of underwater acoustic signal has been paid extensive attention by the country and enterprises.With the demand of modern military development and the need of Marine career development,the development speed of underwater acoustic signal research and application is bound to become faster.In order to understand Marine information better,it is necessary to collect Marine acoustic signal data.For the purpose of being placed in the ocean to record underwater acoustic signal for a long time and making an innovation to collect underwater acoustic signal for the large dynamic range in fixed position and improving circuit setting methods,like amplifier and sampling,the study designs a large dynamic range of the underwater acoustic signal recording device for a long time,makes it to monitor acoustic biological voice and the sound of explosion to marine engineering under low power condition.First,the paper provides the overall design scheme of the whole recording device of underwater acoustic signals according to the design requirements.Then,for the working characteristics and data acquisition requirements of the device,it designs and draws the circuit schematic diagram and makes the circuit boards.The hardware circuit design mainly includes the main control chip selection,the amplifier circuit design,the filter circuit design,the analog to digital conversion circuit design,the memory circuit design and some auxiliary circuit designs.In the third chapter,the paper tells the software development process of underwater acoustic signal recording device,including the system development tools,system clock working way,real time clock module working method,method of underwater acoustic signal acquisition,data storage program design and FATFS file system's usage method,finally make the underwater acoustic signal data stored in a micro SD in TXT text form.At last,the paper analyses the performance of the whole recording device and the experimental results.Through testing,the underwater acoustic signal recording device designed in this paper can work stably and record the underwater acoustic signal in large dynamic range for a long time in the low-power mode.