Benthal three-dimensional sonar image imaging system based on multi-FPGA parallel processing

Abstract

The invention discloses a benthal three-dimensional sonar image imaging system based on multi-FPGA parallel processing. The system adopts a principal and subordinate distributed type structure, uses FPGA and an embedded type processor to complete the processing and the transmission of echo signals and comprises 48 subordinate signal processors, one principal signal processor and one data transmission processor. When the data transmission processor of the system receives a data collection starting command transmitted by an upper computer, multi-path analog-to-digital converters on the subordinate signal processors begin to work synchronously, carry out discrete Fourier transformation on data collected by the multi-path analog-to-digital converters and transmit a calculation result to the principal signal processor, the principal signal processor calculates the calculation result to obtain a wave beam energy matrix, and the wave beam energy matrix is transmitted to the data transmission processor and is finally transmitted to a PC machine at a host terminal. In the invention, the system generates 16384 real-time wave beam signals by synchronously collecting 2304 paths of echo signals and obtains three-dimensional sonar images by real-time signal processing.

Description

technical field [0001] The invention relates to FPGA technology and distributed parallel computing technology, in particular to a multi-FPGA parallel processing submarine three-dimensional sonar image imaging system. Background technique [0002] "Phased array three-dimensional acoustic camera sonar" is a new type of real-time three-dimensional image sonar, which uses one sound pulse to penetrate the entire observation volume, simultaneously generates 16384 real-time beam signals, and obtains three-dimensional sonar images through real-time signal processing. Up to 20 update rates per second. [0003] The imaging principle of the phased array three-dimensional acoustic camera sonar system is to use a digital beamformer to delay the echo signal and then perform a multiply-accumulate operation. [0004] Previous sonar imaging systems are usually implemented using a digital signal processor (Digital Signal Processor, DSP). DSP has the advantages of relatively mature technolog...

AI Technical Summary

Problems solved by technology

[0006] Although a single FPGA chip has achieved high computing performance, due to the limitation of semiconductor technology, the speed and performance of the device cannot be infinitely improved.

Moreover, due to the application of high-speed devices, it also brings a series of new problems to the design and reliability of the system, such as increased power consumption, deterioration of signal integrity, and difficulty in ensuring the electromagnetic compatibility of the system, etc.

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