Molecular array arrangement method based on coprime idea with low sidelobe

Abstract

The invention discloses a low sidelobe molecular array arrangement method based on the idea of ​​mutual prime, which belongs to the field of array signal technology. The arrangement method of the invention is as follows: a one-dimensional initial Linear array, the spacing between each sub-array is Md, the spacing between array elements in each sub-array is Nd, d is half the carrier wavelength, M and N are mutually prime; expand the one-dimensional initial linear array: each A sub-array is added with a array elements to obtain an extended sub-array, where a is not less than 0.5M, and the distance between the array elements of the extended sub-array is Nd; a extended sub-array is added, and the distance between the extended sub-arrays is equal to is Md; the expanded one-dimensional linear array structure is obtained by removing the coincident array elements. At the same time, the further expansion of the present invention can also be used for array processing of two-dimensional arrays, such as extending along the X or Y axis directions of the three-dimensional coordinates, or extending along the X and Y axis directions simultaneously to obtain a two-dimensional array structure. The invention has good expandability and excellent scanning performance, and the corresponding beam pattern has narrow main lobe and low side lobe.

Description

technical field [0001] The invention relates to an array arrangement technology and a beam forming technique in the field of array signal processing, in particular to a low sidelobe molecular array arrangement method based on a mutual prime idea. Background technique [0002] The array structure of the antenna array plays an important role in many practical engineering applications. By planning the structure of the antenna array and arranging the positions of the array elements, the antenna can obtain an ideal beam shape, low side lobe level, and strong directivity. [0003] Beamforming technology (Beamforming) is an important part in the field of array signal processing. Beamforming is to construct a spatial filter. By changing the weight of the filter, signals in certain directions can pass through the filter while suppressing signals in other directions. [0004] From a system perspective, beamforming techniques can be classified into static beamforming and adaptive bea...

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Problems solved by technology

[0006] Although the uniform linear array (ULA) has a simple structure and is convenient for mathematical calculation and assembly, it also has defects: First, in order to improve the resolution of the array, a larger array aperture is required, and in order to prevent grating lobes, the array element spacing is required to be no more than half In this way, the number of array elements is increased, which greatly increases the hardware cost and maintenance cost; second, when the antenna wavelength is small, the mutual coupling effect between the array elements will reduce the performance

However, the sidelobe of the beam pattern of the coprime array is relatively high. At present, there are basically no methods proposed in the literature to reduce the high sidelobe problem of the coprime array.

And for the above-mentioned non-uniform arrays, it is impossible to reduce the side lobes by ordinary windowing, so it is not very ideal

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