Array antenna beam forming method

Abstract

The invention relates to an array antenna beam forming method and belongs to the technical field of wireless communication and signal processing. The invention relates to an array antenna phase-only conversion beam forming method, beam forming of different radiation requirements can be achieved through phase weighting under a condition that power is maintained unchanged. The method comprises the following steps of using a quantification particle swarm algorithm to obtain an element amplitude value corresponding to each ideal directional diagram as an initial value of iterative Fourier transform; applying inverse discrete Fourier transform (IDFT) to obtain an array directional diagram; comparing the array directional diagram with an expected directional diagram to obtain a new directional diagram; and applying fast Fourier transform (FFT) to obtain new element excitation through inverse computation. According to the method provided by the invention, the directional diagram forming rapidity and effectiveness of a quantification particle swarm algorithm and the final convergence ability and high convergence speed of an iteration Fourier transform algorithm are combined, and the capability of beam coverage in a spatial domain of each directional diagram with only phase change is improved, so that the method provided by the invention has better 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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