Research And Implementation Of Underwater Acoustic Signal Acquisition?Dispose ?Storage And Upload System Based On OMAP-L138

Underwater acoustic signal acquisition and processing is one of the important branches in the field of underwater acoustic research.It is also widely used in underwater resource development,underwater target location,military and civilian facilities.With the rapid development of semiconductor technology,the embedded microprocessor is smaller,faster and lower power consumption and its application in the field of underwater acoustic signal processing is also of concern.This paper is based on the TI OMAP-L138 embedded microprocessor as the core design of the underwater acoustic signal acquisition and processing platform,the platform realizes the functions of continuous acquisition,processing,storage and transmission of underwater acoustic signals.In this paper,the design and implementation of the hardware,algorithm and software of the underwater acoustic signal acquisition system based on the actual needs of an underwater acoustic signal processing project.This paper first discusses the hardware platform design of the underwater acoustic signal acquisition and processing system based on low power embedded processor TI OMAP-L138.The whole hardware platform is divided into 5 parts: acquisition module,storage module,power supply module,system interface and debugging control module.Complete the schematic design and PCB drawing of each function module,as well as the subsequent hardware debugging.This paper continues to complete the software design of the underwater acoustic signal acquisition and processing system,the system software is divided into underwater acoustic signal acquisition,storage,processing and upload a total of four modules.First of all,to establish a software development platform,and then use the OMAP-L138 processor to complete the continuous acquisition of underwater acoustic data.The collected data is checked to determine whether the signal is present or contains only noise.If a signal is detected,it is stored in the SD card.When a continuous signal is detected ended,the previously saved underwater acoustic signal data is used to determine the signal type,estimate the center frequency,bandwidth,signal duration and other information and finally write to the SD card.This paper also studied the Lw IP protocol to achieve PC and the underwater acoustic data acquisition board network interface communication.After receiving the data upload command from the PC serial port,the DSP core in the OMAP-L138 will upload the underwater sound signal stored in the SD card through the network port to the local file storage on the PC side for subsequent processing.This article also studied the OMAP-L138 processor dual-core boot process,and make the application program into AIS format programming to the board NAND Flash,the ARM cor wake up the the DSP implement the task.Finally,this paper also puts forward some improvement measures in terms of hardware and software.