Broadband beam forming method based on multistage filter bank

Abstract

The invention discloses a broadband beam forming method based on a multi-stage filter bank, and provides a multi-stage filter bank method to realize the delay compensation of broadband signals from the perspective of saving hardware resources and practical application according to the design difference of various delay filters. The method aims at fractional time delay filtering compensation, integer time delay can be compensated by adopting a digital delay line method, and accurate time delay compensation can be realized by carrying out hierarchical filtering on each array element receiving signal of an array. Through the structure of the multi-stage filter bank provided by the invention, the delay filtering time is realized. Due to the fact that the filtering coefficients of all sets of delay filters are only related to the sampling period of the signal, only a small number of filtering coefficients need to be stored, the whole filter bank can be designed in advance to be stored, real-time calculation of the coefficients is avoided, and the method has important value in practical application.

Description

technical field [0001] The invention belongs to the field of radar and sonar systems, and in particular relates to a broadband beam forming method based on a multistage filter bank. Background technique [0002] In array signal processing, it is necessary to perform signal detection and parameter estimation according to the spatial characteristics of signal and noise interference, and beamforming is one of the important research directions. Beamforming can be divided into narrowband beamforming and broadband beamforming according to the difference in bandwidth relative to the center frequency. Now in many fields such as radar, medical imaging and underwater sonar, in order to obtain higher resolution, identification and anti-interference ability, the array often needs to use a wideband signal with a large bandwidth for processing. Wideband beamformers can usually be designed using two methods, time domain and frequency domain. The frequency domain processing method is to di...

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Problems solved by technology

[0003] Usually, the delay filter needs to calculate the filter coefficient of the filter in real time according to the delay of each input, or store a large number of filter coefficients in advance, which will occupy a large number of storage units and require a large amount of calculation in practical applications. , which brings great difficulties to the realization of hardware, and through

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