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Near-field phased array beam focusing method

A beam focusing and phased array technology, applied in the direction of electrical components, antennas, etc.

Active Publication Date: 2014-07-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Military phased arrays usually work in the far field that meets the plane wave conditions, and the Fourier transform relationship between the scanning beam and the array unit amplitude and phase is widely used in the industry, and near-field applications that do not meet the far-field conditions will become more important in the future. General normality, the traditional method of phase shift control beam scanning is not applicable

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  • Near-field phased array beam focusing method
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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The basic principle of the present invention is that coherent excitation signals are transmitted or received through each array unit, such as figure 1 As shown, by controlling the amplitude and phase of each unit, a high-performance beam is coherently synthesized in the near-field area, and the optimization calculation process of the near-field focused beam control is as follows: figure 2 shown. The near-field phased array beam vector is expressed as the product of the Green operator matrix of the free-space wave equation and the element amplitude and phase vector,

[0023]

[0024] Among them, Green's function (r m ≠r′ n ) is the point source impulse excitation response of the free-space wave equation, W n (r' n ) is the amplitude-phase weight of the array unit, P m (r m ) is the near-field beam to be synthesized, (k is t...

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Abstract

The invention relates to a near-field phased array beam focusing method. A lobe pattern comparable with a far field is formed in the near field of caliber according to non-linear phase shift of a point source; initial amplitude phase weight of each unit of the array is acquired by a method for acquiring ideal lobe pattern and evaluating Moore-Penrose generalized inverse by using a near field transmission operator; analytic expression serves as reference; parameters such as orientation, null depth, minor lobe and the like of beams are optimized; and high-performance beams are comprehensively formed in the near field of the phased array.

Description

technical field [0001] The present invention relates to a near-field phased array beam focusing algorithm, which is mainly used in the control of phased array beams, and is used to focus and form high-performance beams comparable to far-field lobes and capable of phase-controlled scanning in the near-field area . Background technique [0002] The phased array technology realizes the scanning of the beam direction by changing the phase of the unit, which is different from the traditional mechanical rotation beam control. The phased array system has more functions, stronger detection capabilities, larger coverage airspace, higher data rate, and higher reliability to adapt to complex and changeable target environments. The phased array beam can jump in the whole airspace within microseconds, the beam is flexible and changeable, it is easy to realize adaptive sidelobe suppression and combat various interferences, and the signal processing and beam control can be realized by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q3/30
Inventor 李志平许鼎武建华
Owner BEIHANG UNIV