Array antenna phase-only transform beamforming method based on QIWO_IFT combined algorithm

Abstract

The invention relates to an array antenna phase-only transform beamforming method based on a QIWO_IFT combined algorithm, and belongs to the technical field of wireless communication and signal processing. The invention relates to the array antenna phase-only transform beamforming method, i.e. different radiation requirements of beams are realized by phase weighting only under the condition of unchanged power. The method comprises the following parts that the unit amplitude and phase value corresponding to each ideal directional graph is obtained by using a quantitative invasion weed method to act as an initial value of iterative Fourier transform, an array directional graph is obtained by applying inverse discrete Fourier transform (IFFT) and then compared with an expected directional graph so as to obtain a new directional graph, and new unit excitation is reversely calculated by applying fast Fourier transform (FFT). Beam coverage capacity of the airspace of each directional graph of phase-only transform is enhanced through combination of rapidity and effectiveness of quantitative invasion weed method directional graph forming and the characteristics of final convergence and high convergence speed of the iterative Fourier algorithm so that the method has great engineering practicality.

Description

technical field [0001] The invention relates to a beam forming method based on phase-only transformation of an array antenna. It involves the technology of changing the far-field pattern under the condition that the current amplitude is constant and only the phase is changed. Background technique [0002] The array antenna phase-only transformation beamforming technique is a method to change the pattern forming only by phase weighting. Different radiation patterns are used to achieve different functions. In many practical applications, such as air traffic control radar, spacecraft, satellites, and wireless communications, different radiation patterns need to be generated. The phase-only transformation beamforming method enables the antenna system to use only one antenna array to complete different tasks, which requires some algorithms to find a set of reasonable excitation weights to control the direction, width, shape, and side lobe electric field of the antenna beam. Th...

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Problems solved by technology

[0003] The conventional method is to use the excitation phase of the unit as the optimization variable, and complete it through an optimization algorithm. For example, Davis applies the least square method to the phase-only weighted array beamforming; Haupt uses the genetic algorithm to realize the phase-only weighted adaptive zero point generation; Khzmalyan uses the single-coordinate minimization method to realize phase-only weighted beamforming and adaptive zero-point generation. When the number of units in the conventional method is large, there are many optimization variables, which makes the optimization process very time-consuming and the optimization results cannot be approximated. ideal pattern

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