Real-time parallel time-delay and phase-shift beam forming method based on field programmable gate array (FPGA)

Abstract

The invention discloses a real-time paralle time-delay and phase-shift beam forming method based on a field programmable gate array (FPGA), which includes: (1) the FPGA receives half of beam forming coefficient data at an expected angle and stores the beam forming coefficient data into a connected static random access memory (SRAM); (2) the FPGA receives sample data from receipt signals of each of array elements of arrays and stores the sample data in a first Block random access memory (RAM), and also performs an alternant read-write in two groups of the first Blocks RAM; a group of corresponding beam forming coefficient data from SRAM are read and stored in a group of Q second Block RAMs of FPGA; (3) simultaneously, beam forming coefficient data of Q second Block RAMs are read, one sample datum of the first Block RAM is selected according to the time-delay amount; the two arrays of data are performed multiplication and accumulation to obtain Q beam forming results which are stored inQ latches; the results are sequentially sent out in time sharing until all beam forming results are sent out; and (4) before the sample data of next sampling moment of receipt signals of each of array elements of arrays arrive, the step (2) is repeatedly executed until the process of the beam forming of whole received sample data from receipt signals of each of array elements of arrays is finished.

Description

technical field

[0001] The invention belongs to the field of beamforming processing, and in particular relates to FPGA-based high-speed beamforming processing, specifically an FPGA-based real-time parallel time-delay phase-shifting beamforming method for receiving data from a high-sampling rate matrix. Background technique

[0002] Beamforming is a commonly used signal processing method in the field of signal processing, and it is widely used in radar, sonar, wireless communication and other fields. For example, when multi-beam sonar detects seabed terrain, it is necessary to perform beamforming processing on the echo signals received by the array to separate seabed echoes from different angles, so as to obtain depth information of multiple seabeds at one time.

[0003] In the actual system, the received signals of the base array are generally demodulated, filtered and sampled first, and then converted into discrete digital baseband signals in the form of complex numbers. A...

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