Method for reducing array element scale of spherical cylindrical array in sparse manner

Abstract

The invention discloses a method for reducing the array element scale of a spherical surface array in a sparse manner, and aims to provide a method capable of reducing the array scale after sparsification and maintaining electrical performance equivalent to that of a full array at the same time. The method is realized through the following technical scheme: the method comprises the following steps: defining an array coordinate system according to a rule of half-wavelength uniform arrangement of antenna units in the antenna subarray; adopting a sparse optimization algorithm to set initial parameters, construct a constraint matrix, generate an initial group, sparsify the sub-array, and calculating a fitness function of each curved surface sub-array individual in the group to form a sparsified basic sub-array unit with optimal fitness; constructing a spherical cylindrical surface array model based on curved surface subarray level sparseness by the sparsified basic subarray units accordingto a spherical cylindrical surface array equal-area region center arrangement rule; and finally, increasing the diameter of the spherical surface to obtain a spliced sparse spherical cylindrical surface antenna array, and compensating the total synthetic gain of the antenna array by increasing the unit gain to obtain a gain value and a minor lobe which are equivalent to those of a spherical cylindrical surface full array.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a method for reducing the scale of a sphero-cylindrical array element through thinning. Background technique [0002] At present, by exciting high-frequency currents with different amplitudes and phases to different antenna elements in the array antenna, a phased array antenna that can scan the space in the maximum radiation direction of electromagnetic waves can be realized. However, because the planar phased array cannot achieve the beam coverage of the entire airspace and cannot meet the needs of the entire airspace measurement and control communication function, the spherical phased array antenna came into being. One of the most significant advantages of the spherical phased array antenna is that the beam coverage of the entire airspace can be achieved by activating different areas of the spherical cylindrical array. However, the spherical conformal array is aff...

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Problems solved by technology

[0004] The main lobe width of the beam of the sparse array antenna is almost the same as the main lobe width of the full array with the same caliber, so that under the premise that the antenna cost is roughly the same, the sparse array antenna has more advantages than the full array antenna with the same number of array elements. Larger apertures, and thus narrower mainlobe widths, provide better resolution of targets, however gain and sidelobe characteristics necessarily deteriorate as the array is thinned out

In addition, for the surface thinning process, if the entire spherical surface is directly used for the thinning algorithm, it will not only increase the space-time complexity of the algorithm, but also the optimization result will easily fall into the local optimal solution, which is not conducive to engineering implementation. There will also be disadvantages such as lower gain than the full array with the same aperture

Therefore, there is currently no perfect and mature sparse conformal spherical-cylindrical array that can meet the needs of engineering realization.

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