Grating lobe suppression method and system based on uniform linear array broadband beam forming

Abstract

The invention discloses a grating lobe suppression method and system based on uniform linear array broadband beam forming. The method comprises the steps of determining the spacing of array elements and the number of the array elements according to the bandwidth of a received signal and the required precision; calculating the scanning angle of each frequency point without grating lobes based on the half wavelengths corresponding to the different frequency points and the spacing of the array elements; calculating a covariance matrix of each frequency point in a bandwidth range for the preprocessed received signal, and obtaining a low grating lobe covariance matrix of each frequency point according to the scanning angle of each frequency point; and solving the weight of each frequency pointby adopting an adaptive beam forming algorithm through the low grating lobe covariance matrix, and performing broadband beam forming of the uniform linear array according to the weight of each frequency point. The method solves the problem of grating lobes caused by beam scanning in broadband beam forming, is suitable for a uniform linear array and is not affected by the size and form of an antenna.

Description

technical field [0001] The present disclosure relates to the technical field of grating lobe suppression, in particular to a grating lobe suppression method and system based on uniform linear array broadband beamforming. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The selection of array element spacing will affect the generation of grating lobes. Generally, in order to avoid grating lobes within 90°, it is required that the array element spacing is not greater than half the wavelength of the received signal. However, for broadband signals, if the array element spacing is selected to correspond to the highest frequency If the half-wavelength is less than half-wavelength, no grating lobes will be generated within the 90° range. However, due to the constraints of the physical aperture of the antenna, the selection of the array element sp...

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Problems solved by technology

Therefore, this method is only applied under specific conditions, and the universality is not high and it is relatively complicated.

[0007] Therefore, the inventor believes that most existing broadband beam grating lobe suppression schemes rely on specific antenna arrangements and complex algorithms, are not easy to implement, and are not suitable for uniform linear arrays

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