Single-chip-FPGA-based large-scale circular-array real-time beam former and beam forming calculation method

Abstract

The invention discloses a single-chip-FPGA-based large-scale circular-array real-time beam former and a beam forming calculation method. The beam former is composed of a frequency domain data arrangement module, a driving vector calculation module and a parallel multiplication module. With full utilization of the symmetry of the circular array, driving vectors of only half of array elements need to be calculated and employ an assembly line CORDIC algorithm. Driving vectors and frequency-domain data are inputted into shift registers with depths of N / 2 and N respectively; after the N frequency domain data enter of the shift register with the depth of N enter, front and back symmetric positions are added and the data are multiplied by the driving vectors, so that the resources of N / 2 complexmultipliers are saved. Because the N / 2 complex multipliers are used for carrying out complex multiplication in parallel, one-frequency-point one-beam data are outputted at one clock; and after frequency domain data input completion, the output of the Nbth beam data is completed simultaneously, so that the beam forming efficiency is increased substantially.

Description

technical field [0001] The invention relates to the field of high-frequency sonar real-time signal processing, and mainly relates to a single-chip FPGA-based large-scale circular array real-time beamformer and a beamforming calculation method. Background technique [0002] Beamforming technology is an important part of sonar signal processing. It is widely used in active sonar and passive sonar. It is an important indicator to measure the performance of sonar. The huge amount of calculation in the beamforming algorithm is a difficulty that real-time sonar systems must overcome. one. [0003] Traditional beamforming is implemented by a general-purpose digital signal processor (Digital Signal Processing, DSP). DSP is a microprocessor with a special structure, which is usually used to quickly implement the complex parts of various algorithms, and at the same time has a software update speed. Fast, versatile and flexible advantages. But limited by the serial structure, in the ...

AI Technical Summary

Problems solved by technology

[0005] At present, the field of large-scale array beamforming using a single FPGA is still in its infancy, and there is no practical solution for beamforming calculations for large-scale arrays of different formations

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