Aiming at problem of large size

heavy weight and can’t work flexibly underwater of traditional 3D sonar device

a design of portable 3D underwater sonar real-time imaging system is proposed. Control multiple path signal for synchronization sampling by FPGA

beamforming algorithm is optimized to improve processing speed of sonar signal

digital media processor based on low power consumption is used to achieve 3D modeling and image display by the way of parallel processing. Experimental result shows that the system can work for 4 h offline

and its weight underwater is zero

and is able to form 3D imaging with a resolution of 1. 2° within the range of 40 m

and the image refresh rate can reach up to 25 frames / s.