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Unit layout and electromagnetic design method of fuselage conformal array antenna

A conformal array, electromagnetic design technology, applied in the direction of manufacturing antenna array devices, antennas, antenna arrays, etc., can solve problems such as pattern deformation and reduction of optimization speed

Inactive Publication Date: 2017-08-04
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

However, for a large array (with a large number of units) such as a fuselage conformal array antenna, it is unrealistic to use the excitation of each antenna unit as an optimization variable, which will not only reduce the optimization speed but also bring about the vibration caused by the amplitude oscillation of the array Problems such as deformation of the direction map

Method used

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  • Unit layout and electromagnetic design method of fuselage conformal array antenna
  • Unit layout and electromagnetic design method of fuselage conformal array antenna
  • Unit layout and electromagnetic design method of fuselage conformal array antenna

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Embodiment Construction

[0099] Specific embodiments of the present invention will be described in detail below.

[0100] Such as figure 1 As shown, a cell layout and electromagnetic design method of a fuselage conformal array antenna includes the following steps:

[0101] (1) Establish the body coordinate system (such as figure 2 As shown), the sampling points are fitted to obtain the fitting model of the fuselage

[0102] The coordinate origin o is the vertex of the nose, the coordinate x-axis is the axial direction of the fuselage, pointing from the tail to the nose, the coordinate z-axis is vertical to the vertical upward of the fuselage, and the coordinate y-axis is determined according to the right-hand rule, and then the actual machine is calculated by the least square method Body model sampling point p i (x i ,y i ,z i ), (i=1,2,…,K) for polynomial fitting to obtain the fuselage section curve, the schematic diagram is as follows image 3 As shown, its expression is as follows:

[0103...

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Abstract

The invention relates to a unit layout and electromagnetic design method of a fuselage conformal array antenna. The method includes: (1) establishing a body coordinate system; (2) designing a unit arrangement form according to a fuselage structural characteristic, determining a unit spacing, and preliminarily determining a unit number and an array row number according to an electrical performance index; (3) determining position coordinates of the units on a fuselage; (4) selecting a radiation unit, establishing a local coordinate system shown in the description of each unit, and establishing a far-field pattern analysis model of a conformal array by employing a mathematical theory related to coordinate rotation; (5) superposing radiation patterns of the units to obtain a far-field analysis model of the whole array; (6) reducing the number of variables by employing a corrected Bernstein polynomial; and (7) regarding a pitching plane maximum side-lobe level and an azimuth plane maximum side-lobe level as a target function, performing optimization by employing a particle swarm optimization algorithm to obtain a control parameter of the corrected Bernstein polynomial, and sampling the polynomial to obtain an excitation amplitude value of an antenna unit.

Description

technical field [0001] The invention belongs to the technical field of airborne conformal array antennas, and in particular relates to a unit layout and electromagnetic design method of a fuselage conformal array antenna. Background technique [0002] At present, there are mainly two types of AWACS radars in active service in the world: "disc type" and "balance beam type". What they have in common is that the radar is installed on the middle and rear of the aircraft carrier platform. Since the radar protrudes from the airframe, such a design scheme seriously affects the aerodynamic performance of the early warning aircraft, and is not conducive to the stealth of the airframe and radar. [0003] Israel's "Falcon" early warning aircraft adopts the design scheme of installing the radar inside the body, but the antenna arrays on both sides of the fuselage still use the planar array antenna form, which inevitably brings some shortcomings of the planar array antenna. For example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/00H01Q1/28G06F17/50
CPCG06F30/20H01Q1/285H01Q21/0087
Inventor 宋立伟韩创张超王从思李鹏周金柱李娜王伟
Owner XIDIAN UNIV
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