Planar Array Antenna and Difference Beam Pattern Synthesis Method Based on Hybrid Algorithm

Abstract

A planar array line and difference beamforming method, that is, under the premise of reducing the complexity of the feeder network, only changing the current excitation and phase excitation of some array elements to realize the conversion between sum and difference beams, the invention includes the following parts : Use the improved iterative Fourier algorithm to obtain the unit current excitation value corresponding to the sum and difference beam patterns that meet the performance requirements such as sidelobe level and 3dB beam width, and retain the same excitation unit part corresponding to the two beams Amplitude, and then use the improved quadratic programming algorithm to seek the excitation value of the array element outside the common excitation unit set to meet the respective performance index requirements of the sum and difference beams, including: maximum sidelobe level, slope of the zero point position of the difference beam, and directivity Coefficient etc. The invention realizes the conversion between the sum and difference beams by only changing the current excitation and phase excitation of some array elements under the premise of reducing the complexity of the feeder network.

Description

technical field [0001] The invention relates to the technical fields of wireless communication and signal processing, in particular to a hybrid algorithm-based planar array antenna and a method for synthesizing a difference beam pattern. Background technique [0002] The comprehensive optimization method of planar antenna and difference beam antenna pattern is a technology that only changes the current excitation and phase excitation of some array elements to realize the conversion between sum and difference beams. In many practical applications, suppressing the sidelobe of the array pattern is a basic and very important issue. For a radar system using monopulse technology, it is necessary to suppress the sidelobe of the sum beam and the difference beam at the same time. Two forms of weighting are used on the elements, Taylor weighting for the sum beam and Bayliss weighting for the difference beam. However, for large-scale phased array radars with hundreds to thousands of ar...

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Problems solved by technology

[0003] In order to solve the above existing problems, the present invention provides a planar array antenna and difference beam pattern synthesis method based on a hybrid algorithm. The hybrid optimization method in the present invention avoids the inability of the traditional IFT algorithm to perfect the sum and all radiation performance of the difference beam and the QP algorithm. The shortcoming of a long calculation period when the unknown variable surges, effectively combines the iterative Fourier algorithm and the QP algorithm without parameter adjustment and strong robustness, fast calculation speed, and high precision, and finally realizes the simplification of the feed network, only through The current excitation and phase excitation changes of some array elements are used to realize the conversion between sum and difference beams. To achieve this purpose, the present invention provides a planar array antenna and difference beam pattern synthesis method based on a hybrid algorithm, including the following steps:

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