Distribution method capable of restraining grating lobes of large-space phased-array antenna

Abstract

The invention provides a distribution method capable of restraining grating lobes of a large-space phased-array antenna. The distribution method is characterized in that the whole surface of an array antenna array is divided into four quadrants according to a rectangular coordinate system, and the four quadrants are rotationally symmetrical or axially symmetrical about the center of the quadrants; each quadrant comprises N subarrays, the edges of the N subarrays are not overlapped, and the N subarrays are distributed outwards in the direction of the radius of the array center in a sparsification mode to form an aperiodic array; each subarray comprises M units, the M units are distributed uniformly or disuniformly according to different grid modes, and space among N*M units is larger than a wave length; the shape of the edge of the array is an approximate round, oval, octangle or rectangle. By combining the array sparsification principle and the subarray-level aperiodic structure principle, the array with the space of a unit larger than the wave length is constructed, technical indexes including gain, resolution ratio and grating lobe restraint can be achieved with few antenna units, requirements are met, and cost of an antenna system is reduced.

Description

Technical field [0001] The present invention relates to a method of arranging phased array antennas in the fields of navigation, communications and other fields, and in particular to a grating lobe suppression method of a large-spacing phased array antenna with an array unit spacing of more than one wavelength. Background technique [0002] Phased array antennas are usually composed of a group of discrete radiating antennas. These radiating antennas can be arranged in a linear structure, a two-dimensional planar structure, or a spatial arch structure. The amplitude and phase excitation of each radiating antenna can be controlled independently to form a beam of any desired shape in space. [0003] There are various structural forms of array antennas. The most basic form is a linear array, which refers to an array antenna in which the centers of multiple radiating elements are on a straight line. The spacing between the elements can be equal or unequal. When the centers of th...

AI Technical Summary

Problems solved by technology

The second type of array does not need to constrain the antenna elements on an equally spaced regular grid like the first type of array, so the degree of freedom for optimization is greater, which is conducive to improving the correlation performance of the array antenna to a greater extent. There will be grating lobes, and the grating lobe level can be made very low, but this kind of array will increase the difficulty of manufacturing and processing the array, and make other parts of the array very complicated

[0011] Adjacent arrangement of equal-sized sub-arrays will lead to large grating lobes in the antenna pattern. For this reason, scholars at home and abroad have proposed a method of arranging multiple sub-arrays, such as: rotating sub-arrays. In 1978, Vishwani D .Agrawal and Thomas C.Tong obtained the effect of suppressing grating lobes by using an array composed of four large-spaced sub-arrays rotated. The shortcoming is that the four sub-arrays overlap; in 2002, Mark L.Goldstein et al. In the patent application, a non-periodic sub-array is distributed on four concentric rings, and a sub-array is also arranged in the center. effectively suppressed the grating lobes; in 2003, domestic scholar Zhu Ruiping and others proposed a non-periodic ring grid array, whose array adopts a ring grid structure and a sub-array sub-box structure. It has a certain inhibitory effect; in 2010, Yury V.Krivosheev and Alexandr V.Shishlov analyzed several sub-array arrangements, including: (a) relative displacement of sub-arrays; (b) gaps between sub-arrays; ( c) Add gaps and dislocations between sub-arrays; (d) Take different cell spacings for diagonal sub-arrays; (e) Rotate sub-arrays, these methods suppress grating lobes to a certain extent

Images