A Design Method of Image Sonar

By analyzing the underwater high-speed target tracking and positioning, image sonar was determined as the solution. An image sonar system is constructed. According to the functions of each part of the image sonar, the transducer array, receiver, transmitter and image generation signal processing software are designed. According to the difficulties in the construction of the image sonar system, emphatically introduces the design of the transducer array and receiver. According to the principle of image sonar, designed by 128 piezoelectric ceramic elements joining together, form a circular receiving transducer array. The characteristics of image sonar receiver are multi-channel synchronous receiving and acquisition, high frequency and large amount of data. According to these characteristics, the analog frontend chip and FPGA are adopted as the core for the design. It realizes signal synchronous acquisition, orthogonal filtering, storage and Gigabit Ethernet communication functions. A computer platform is used for beamforming signal processing. It implements data read, phase-shift beamforming and matched filtering, and other functions. By integrating the above hardware and software functions, an underwater high-speed target tracking and positioning systemis formed.