Time domain broadband harmonic region beam former and beam forming method for ring array

Abstract

The invention provides a time domain broadband harmonic region beam former and a beam forming method for a ring array. The beam former comprises a harmonic conversion module and a beam pattern synthesis module. The beam forming method comprises the following steps: sampling array element received data, and processing the sampled data through the harmonic conversion module; and processing ring harmonic region data of each order output by the harmonic conversion module through corresponding FIR (Finite Impulse Response) filters, and summing the ring harmonic region data to obtain beam output. Through adoption of the beam forming method, an obtained time domain broadband harmonic region beam can consider a plurality of performance indexes of the beam former. Moreover, the number of the performance indexes needing to be considered can be reduced appropriately, namely, a cost function and a constraint function are selected appropriately according to practical demands, and different constraint combinations construct different beam optimization criteria, so that the method has very high practicability and wide application adaptability. Furthermore, a channel number M in classical element space beam forming is reduced to N+1 of harmonic region processing in the invention (M is greater than 2N), so that the calculation amount is reduced.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to a time-domain broadband harmonic domain beamformer and a beamforming method for a circular array. Background technique [0002] Beamforming processing is widely used in the fields of microphone arrays, sonar, radar, and wireless communications. The general array element domain beamforming process is as follows: a spatially distributed sensor array is used to collect data, and then the collected array data is linearly weighted and combined A scalar beam output is obtained after processing, which is done by the beamformer. By designing the weighting coefficients, the response of the array receiving system is directional, so the beamformer can be used for spatial filtering to improve the signal-to-noise ratio. [0003] In the published document of the existing invention patent No. ZL 201010186643.1, a time-domain broadband beamformer implementation method for spherical array ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a time-domain broadband harmonic domain beam for circular arrays in order to solve the technical problem that existing broadband harmonic domain beamformers and frequency domain processing methods are not suitable for real-time signal processing of circular arrays Formers and Beamforming Methods

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