Sparse array optimization configuration method for reducing distance dimension beam forming side lobes

Abstract

The invention discloses a sparse array optimization configuration method for reducing distance dimension beam forming side lobes. The method comprises the following steps: step 1, according to the aperture D and array element number N of sparse distribution antenna array distribution, taking a non-uniform array form of odd elements as a basic array form of a distributed sparse array; 2, selecting a central array element of the sparse distribution antenna array as a reference array element; step 3, calculating an array element spacing adjustment basic quantity required by the basic array; step 4, calculating an X coordinate of each array element relative to the reference array element; step 5, calculating a phase weighting matrix formed by the phase weighting vectors; step 6, calculating a distance dimension beam pattern taking the distance r as a variable; 7, random disturbance is set for the positions of the array elements; and step 8, calculating a new beam pattern. Under the condition that amplitude weighting is not needed, the distance dimension digital beam forming effect of a low side lobe is achieved only by optimally configuring the positions of the array elements, and therefore the influence of interference signals entering from the side lobe in the distance dimension is reduced.

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. ...

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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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