Beam former based on field programmable gate array (FPGA) and sparse energy converter planar array

Abstract

The invention discloses a beam former based on a field programmable gate array (FPGA) and a sparse energy converter planar array, comprising a sparse energy converter planar array, an analog adjusting circuit, an analog-to-digital conversion chip and an FPGA chip, wherein the sparse energy converter planar array is used for converting a seabed sonar echo signal into a weak electric signal; the analog adjusting circuit is used for carrying out the signal adjustment of fixed gain magnification, time varying gain control, bandpass filtration and the like on the weak electric signal; and the analog-to-digital conversion chip is used for synchronously sampling the analog electric signal after signal adjustment and converting the analog electric signal into a digital signal; and the FPGA chip carries out beam forming calculation, carries out L point discrete Fourier transform on all sampling passages of the analog-to-digital conversion chip to obtain S<m, n>(1) and carries out multiplication accumulation operation on the discrete Fourier transform result S<m, n>(1). The invention can be applied to a phased array three-dimensional sonar image system with high resolution ratio, optimizes a beam forming algorithm and greatly reduces the multiplication accumulation calculation needed by a system and the system cost.

Description

technical field [0001] The invention relates to FPGA technology and submarine three-dimensional image sonar technology, in particular to a beamformer based on FPGA and sparse transducer array. Background technique [0002] Beamforming calculation is a commonly used signal processing method in the field of signal processing. It has a wide range of applications in the fields of sonar signal processing, radar signal processing, and ultrasonic detection. However, due to the large amount of data to be processed, in practical applications It is often difficult to perform calculations on large beams. The beamforming algorithm needs to do many times of multiplication and addition, and the ability of the beamformer to perform multiplication and addition operations directly affects the overall performance of the system. [0003] A transducer area array of a certain size is necessary for a high-resolution phased array three-dimensional image sonar system: in order to prevent large sid...

AI Technical Summary

Problems solved by technology

[0006] At present, the field of beamforming calculation using FPGA is still in its infancy, and some achievements are also exploratory research on beamforming calculation based on FPGA, and the current sparse area array in high-resolution 3D image sonar system The architecture and adoption are also in the exploratory research stage, and there is no practical solution for large-scale beamforming calculations

Images