Phase-only weighted array antenna beam shaping optimization method based on MIFT and CP hybrid algorithm

Abstract

The invention discloses an array antenna phase-only transformation beam shaping method, which implements beam shaping with different radiation requirements only by phase weighting under a condition that the power keeps unchanged. The method comprises the following steps: obtaining element excitations corresponding to directional diagrams which meet respective radiation performance requirements by employing an improved iterative Fourier algorithm, and retaining each unit phase excitation value corresponding to each type of beams therein; and then, finding a common unit excitation current value by employing an improved convex optimization algorithm to meet higher radiation performance requirements of each directional diagram, such as a smaller main lobe wave in each directional diagram, a lower side-lobe level value and the like. A hybrid optimization algorithm disclosed by the invention effectively combines the iterative Fourier algorithm and the convex optimization algorithm, does not need parameter adjustment and has the characteristics of strong robustness, fast computation speed and high precision, thereby finally implementing simplification of a feed network; and only through a phase excitation change of array elements, the beam shaping with the different radiation performance requirements is implemented.

Description

technical field [0001] The invention relates to the technical fields of wireless communication and signal processing, in particular to a phase-only weighted array antenna beamforming optimization method based on a MIFT and CP hybrid algorithm. Background technique [0002] In many radar applications, array antennas are required to form beams of specified shapes to meet the needs of different tasks. There are many different beamforming methods for array antennas, which can generally be divided into three categories: the first type is that the unit excitation current and phase are simultaneously adjusted, that is, complex weighting; the second type is that only the unit excitation current is changed, that is, only the amplitude Weighting; the third type is that only the unit excitation phase value changes, that is, only phase weighting. For active phased array antennas, phase weighting does not require additional hardware equipment, and only needs to pre-store a set of wave c...

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Problems solved by technology

[0003] For this global optimization problem, the conventional solution is an intelligent optimization algorithm, such as the phase-only weighted beamforming based on the improved particle swarm optimization algorithm, "Electronic Design Engineering", Vol.21, No.15, Aug.2013, in improved particle swarm optimization algorithm), but when the number of processing units in the intelligent optimization method is large, the optimization variables will increase sharply, resulting in an extremely time-consuming optimization process, and the optimized results cannot approach the ideal direction diagrams.

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