Fast implementation method for comprehensive minor lobes of array antenna radiation field and scattered field

Abstract

The invention discloses a fast implementation method for comprehensive minor lobes of an array antenna radiation field and a scattered field. The fast implementation method comprises the following steps of (1) determining structure parameters, electromagnetic working parameters and array surface distribution parameters of an array antenna; (2) determining an initial sparse arrangement scheme of the array antenna to obtain a sparse arrangement matrix of array antenna units; (3) calculating phase difference between the radiation field and a radiation field actinal surface of the array antenna; (4) calculating a radiation pattern function of the array antenna and calculating the maximum minor lobe level of the radiation field of the array antenna under the sparse arrangement scheme; (5) calculating a scattering pattern function of the array antenna and calculating the maximum minor lobe level of the radiation field of the array antenna under the sparse arrangement scheme; and (6) judging whether the radiation field and the scattered field simultaneously meet the requirement on low minor lobes or not under the sparse arrangement scheme of the array antenna until the optimum sparse arrangement scheme by which the requirements on the low minor lobes of the radiation field and the scattered field of the array antenna can be met simultaneously is obtained. By the fast implementation method, the low minor lobe performance of the radiation field of the array antenna and the low minor lobe performance of the scattered field of the array antenna can be simultaneously realized.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a method for simultaneously realizing low sidelobes in a radiation field and a scattering field of an array antenna. Background technique [0002] Stealth technology occupies a very important position in modern warfare, and has been valued and developed by more and more countries. With the development of shape stealth technology and the application of new materials, the radar cross section (Radar Cross Section, RCS) of the target itself is already very small, so the antenna has become the main contributor to the RCS of the platform it is equipped with. Array antennas can form radiation characteristics different from ordinary single antennas, especially can form radiation that is much stronger than single antennas pointing to a certain part of the space, and because of its advantages of high reliability, multiple functions, and strong detection and tracking capabiliti...

AI Technical Summary

Problems solved by technology

Among them, amplitude weighting makes each unit of the phased array antenna connected to attenuators with different weights, which additionally increases the cost of the system and the complexity of feeding

Moreover, the scattering problem of the array antenna cannot use the amplitude weighting method to reduce the sidelobe level; the effect of the phase weighting method to achieve low sidelobe is limited, because it is difficult to obtain better low sidelobe performance indicators only by phase weighting, and phase weighting It cannot be used to realize the low sidelobe of the array antenna scattering field; the irregular antenna element spacing obtained by the equal-amplitude and unequal-spacing array in the density weighting has brought great difficulties to the engineering implementation of the array structure design, heat dissipation design, and process processing. Great difficulty, the sparse array low sidelobe realization method in density weighting can not only be used to achieve low sidelobe of radiation field and scattered field at the same time, but also has almost the same main lobe width compared with full array with the same aperture , and compared to the array with the same number of elements, the sparse array has a narrower main lobe and higher resolution, and the cost is lower than that of the full array. This method has been adopted by some large-scale high-performance phased array antennas

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