Design Of Data Acquisition And Storage Platform For Embedded Side Scan Sonar

Marine detection is the basis of marine scientific research and marine resources development.Underwater imaging sonar,which combines underwater acoustic detection technology and digital image processing technology,can quickly obtain two or three dimensional images of the submarine topography.Underwater imaging sonar has a fast acquisition,intuitive display of the characteristics,so it has an irreplaceable advantage in the field of marine exploration.In this paper,the embedded side scan sonar as a smaller,more flexible and low-cost underwater imaging sonar,it has the advantage of being able to be carried on different underwater platforms and has the function of storing sonar data,so that the underwater platform with no cable or can not be towed to work can have the functions of target detection and submarine geomorphy imaging.Based on the development of embedded side scan sonar,this paper studies the hardware and software design and engineering realization of embedded side scan sonar data acquisition and storage platform.Firstly,this paper introduces the working principle and development trend of side scan sonar,and designs the performance index and the overall design scheme of embedded side scan sonar.On this basis,by analyzing the functional requirements of the data acquisition and storage platform,a Cyclone V SoC chip with high-performance ARM9 processor HPS core and high-speed large-capacity FPGA core is selected as the core processor of the platform.This paper discusses the performance advantages of this processor,and the hardware and software development process of the platform based on the chip is described.According to the Cyclone V core board,this paper use modular hardware design method to design the functional base board,and describes the hardware circuit design of each functional module in detail,including circuit design principles,program design,chip selection and circuit structure.Secondly,on the basis of the above hardware architecture,a data transmission system based on Qsys is designed.According to the above function distribution and data flow path,the processor modules and peripheral components needed in the system are allocated reasonably in Qsys.Then configure the hard-core processor HPS and HPS-FPGA high-speed bridge,and interconnect the components according to the requirement of high speed data transmission.In the FPGA side,write hardware logic to complete the sonar data acquisition and the control of the working state of sonar;In the Nios II soft core,write control software through the DMA to achieve high-speed data transmission.In the FPGA side,complete data acquisition and partial control function,and thencomplete the data storage and transmission in the HPS.Transplant embedded Linux system on HPS,generate and update the device tree and other related files according to the actual hardware system,and realize the HPS boot in different ways.On this basis,write procedures of data transmission and control based on HPS-FPGA high-speed bridge in the embedded linux system.At the same time,according to the different working modes of the embedded side scan sonar,the related application software is programmed to realize the transmission of sonar working parameters,sonar data storage and uploading.At last,debug and verify each function module of the system,which proves that the embedded side scan sonar data acquisition and storage platform can meet the requirements of the expected design.