Research And Realization Of Acoustic Imaging Algorithm Based On FPGA

Underwater acoustic imaging technology has played an irreplaceable role in many situations.With wide applying foreground,it has been paid more attention.As the acoustic imaging system usually has large amount of data, high-resolution,real-time imaging characteristics,the processor is required to have capability of high speed,high precision,large storage and real-time processing.Recently,with the development of field programmable gate array, FPGA has much more advantages in real-time processing and parallel processing. In this paper,acoustic imaging algorithm is realized based on FPGA which is the main processor in the system.The hardware design of digital processing system is also completed.Firstly,the technical indicator of acoustic imaging system is provided and analyzed.Then simulated research on the basic principle of acoustic imaging is discussed.Emphasis is placed on FPGA algorithm,such as FFT beam forming, near-field focusing,weighted processing and sector conversion.CORDIC algorithm is researched and adopted in acoustic imaging algorithm.The SDRAM controller and its application on FPGA are introduced.Subsequently,the feasibility analysis on the realization of sector conversion.based on DSP is discussed and successfully achieved.Finally,the hardware system of acoustic imaging is designed according to the evaluation of resource consumption and technical indicator.Experiment is carried out and some discussions are given on the problems occurred in the experiment and relevant resolutions,as well as future promotion concerned.According to the testing results,the software and hardware circuits run well in the experiment,which fulfills the predefined requirement.