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A Broadband Beamforming Method Based on Multistage Filter Banks

A filter bank and filter technology, applied in adaptive networks, electrical components, digital technology networks, etc., can solve the problems of occupying storage units, hardware implementation difficulties, and large amount of calculation, achieving accurate delay compensation, avoiding real-time The effect of computing and saving hardware resources

Active Publication Date: 2021-09-07
HOHAI UNIV
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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

Method used

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  • A Broadband Beamforming Method Based on Multistage Filter Banks
  • A Broadband Beamforming Method Based on Multistage Filter Banks
  • A Broadband Beamforming Method Based on Multistage Filter Banks

Examples

Experimental program
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Embodiment

[0086] Verifying the Performance of Delayed Filter Banks Using Computer Simulation

[0087] Taking the uniform linear array as an example, it is assumed that there are 8 array elements in total, the array element spacing is half a wavelength, and the test signal is a chirp signal, and its form is:

[0088]

[0089] in τ=0.01s is the duration of the signal, the bandwidth of the chirp signal is B=400kHz, and the center frequency is f 0 = 8, Image 6 is the sampling frequency f s =1600kHz signal waveform diagram and its spectrum diagram.

[0090] Using the multi-stage filter bank proposed by the present invention to design a beam with a direction of 20°, the time delay of integer multiple sampling intervals should be eliminated through the digital delay line before entering the designed filter. For this beam pointing at 20°, the number of sections of the digital delay line required by each array element is shown in Table 1. The FIR digital filter design adopts the aforem...

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Abstract

The invention discloses a broadband beamforming method based on a multi-stage filter bank. Aiming at the differences in the design of various delay filters, the present invention proposes a multi-stage filter bank from the perspective of saving hardware resources and practical application The method realizes the time delay compensation of wideband signal; The present invention is aimed at fractional time delay filter compensation, can adopt the method of digital delay line to carry out compensation for integer time delay, by carrying out graded filtering to each array element receiving signal of the array, Just can realize accurate time delay compensation; When the time delay filtering is realized by the structure of this multistage filter bank proposed by the present invention, because the filter coefficient of each group time delay filter is only relevant with the sampling period of signal, so just only A small number of filter coefficients need to be stored, so the entire filter bank can be designed in advance for storage, avoiding real-time calculation of coefficients, which is of great value in practical applications.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00H03H17/00H03H17/02
Inventor 王峰吴云树
Owner HOHAI UNIV
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