Iterative phase feeding calculation method for improving beam pointing accuracy of planar phased array antenna

Abstract

The invention discloses an iterative phase feeding calculation method for improving beam pointing accuracy of planar phased array antenna. First, the coordinates of each array element are determined by taking the central symmetric point of the planar phased array antenna as the origin, and all elements are numbered in turn according to the central symmetric characteristics. Then, the first half ofthe array elements are taken to calculate the theoretical and actual feeding phases of each array element in turn, and the actual feeding phases are obtained by carrying or rounding quantization of the theoretical feeding phases. The principle of minimum pointing error of cumulative beams and the feeding of the latter half of the array elements are completed according to the centrosymmetric characteristics. The invention improves the beam pointing accuracy of the planar phased array antenna effectively with moderate calculation amount and complexity, meeting the requirements of fast beam scanning and tracking in the phased array antenna system.

Description

technical field [0001] The invention belongs to the field of phased array antennas, and relates to an array element iterative phase-feed calculation method for improving the beam pointing precision of a planar phased array antenna. Background technique [0002] Phased array antennas are widely used in radar systems to achieve fast spatial scanning and target detection. The beam pointing of the phased array antenna is controlled by adjusting the excitation current of each array element, including the amplitude and phase of the excitation current. The phase shifter is a key device for adjusting the phase of the array element, including analog phase shifters and digital phase shifters. Among them, the digital phase shifter is widely used because of its advantages of high integration, low power consumption, and stable phase shift value. However, the phase feed accuracy of the digital phase shifter is limited by the number of digits of the phase shifter, and it can only provide ...

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Problems solved by technology

In order to obtain a more stable phase feed result, Dong Liang et al. proposed a random phase feed calculation method based on an intelligent optimization algorithm, and obtained a global optimal solution through random search and multiple iterations. However, this method has a large amount of calculation and high computational complexity. problem, it is difficult to meet the requirements of fast phase feed in the actual system

Chris Hemmi et al. proposed a two-dimensional quantization method, which utilizes the additional degrees of freedom of the array elements orthogonal to the beam scanning direction to improve pointing accuracy, but lacks versatility for general planar arrays

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