A Sparse Array Optimal Configuration Method for Reducing Beamforming Sidelobes in Range Dimension

Abstract

The invention discloses a sparse array optimal configuration method for reducing the distance-dimensional beamforming sidelobe: step 1, according to the caliber distributed by the sparsely distributed antenna array D and number of elements N , the non-uniform array form of odd elements is the basic formation of the distributed sparse array; Step 2, select the central array element of the sparsely distributed antenna array as the reference array element; Step 3, calculate the basis for adjusting the distance between the array elements required by the basic formation Quantity: Step 4, calculate the X coordinates of each array element relative to the reference array element; Step 5, calculate the phase weighting matrix composed of phase weighting vectors; Step 6, calculate the distance dimension beam pattern with the distance r as a variable; Step 7, pair Random perturbation is set for the meta position; step 8, calculate a new beam pattern. Under the condition of no amplitude weighting, the present invention realizes the effect of digital beamforming in the distance dimension with lower sidelobes only by optimizing the position of the array elements, thereby reducing the influence of interference signals entering from the sidelobes in the distance dimension.

Description

technical field [0001] The invention belongs to sensor array optimization array formation and digital beamforming technology in the field of array signal processing, and relates to a sparse array optimization configuration method for reducing distance-dimension beamforming sidelobes. A technology that realizes digital beamforming and reduces sidelobes in the distance dimension, specifically a sparse array optimal configuration method that reduces beamforming sidelobes in the distance dimension. Background technique [0002] Traditional antenna arrays usually adopt a concentrated array arrangement. In order to avoid grating lobes or high side lobes, the array element spacing should usually meet d ≤ lambda / 2, where lambda Indicates the signal wavelength. When the array aperture D distance from radiation source R Satisfy the far field condition R> 2 D 2 / lambda , it can be approximately considered that the incident wave of the radiation source is a parallel wave. ...

AI Technical Summary

Problems solved by technology

However, due to the sparse distribution of array elements, the sidelobe of the range dimension beam will be raised, and the sidelobe interference will be introduced.

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