Cover defect detection method for conformal bearing antenna based on far-field electromagnetic field distribution
A technology of radome and electromagnetic field, which is applied in the direction of using microwave flaw detection, etc., can solve the problem that the antenna cannot be carried by a conformal shape
Active Publication Date: 2017-03-29
XIDIAN UNIV
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Problems solved by technology
The disadvantage of this method is that it is only suitable for detachable composite material covers, but cannot be used for packaged conformal load-carrying antennas
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[0039] The present invention will be described in further detail below with reference to the accompanying drawings.
[0040] refer to figure 1 , the concrete steps of the present invention are as follows:
[0041] Step 1: Establish an analysis model of the coverless conformal load-carrying antenna in the electromagnetic analysis software, and establish a coordinate system O-xyz on the surface of the antenna array, and its components in the x, y, and z directions are represented by i, j, and k, respectively.
[0042] Step 2: Simulate the near-field distribution of the antenna front surface in the electromagnetic analysis software, and obtain the near-field distribution of the antenna front surface, including the electric field E in and magnetic field H in , both can be expressed as:
[0043]
[0044]
[0045] in E respectively in Components in x, y, z directions, respectively H in Components in x, y, z directions.
[0046] Step 3, measure the far field of the co...
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Abstract
The invention relates to a conformal bearing antenna cover body defect detection method based on far-zone electromagnetic field distribution. The method is characterized by comprising the following steps: (1) building an analysis model of a conformal bearing antenna without a cover; (2) simulating the near-field distribution of the surface of an antenna array; (3) measuring a far field of a conformal bearing antenna with a cover; (4) performing grid division on a cover body of the conformal bearing antenna with the cover; (5) inversely calculating transmission coefficients at all parts of the antenna cover body according to a near field on the surface of the antenna array, obtained by simulating in the step (2), and the far field of the antenna with the cover, measured in the step (3); and (6) inversely calculating the material thicknesses of all grid parts of the antenna cover body according to the transmission coefficients at all the parts of the antenna cover body to obtain shapes and positions of material defects. Compared with the prior art, the method has the characteristic that the material defects of the packaged cover body can be detected as the material defects of the cover body of the conformal bearing antenna are determined according to the near field of the antenna without the cover and the far field of the antenna with the cover.
Description
technical field [0001] The invention belongs to the technical field of radar antennas, in particular to a cover defect detection method of a conformal load-bearing antenna based on far-zone electromagnetic field distribution, which can be used to detect closed defects in a conformal load-bearing antenna with a cover. [0002] technical background [0003] The conformal load-bearing antenna is a new type of antenna structure that has both the electromagnetic function of the antenna and the structural load-bearing function. It can be integrated into the skin of the outer surface of the aircraft. While realizing the electrical performance of the antenna, it can obtain a smooth and smooth fuselage surface without affecting the aircraft at all. Excellent aerodynamic performance and is conducive to stealth, and its harsh working environment makes it an essential requirement to be equipped with a radome. [0004] Modern conformal load-bearing antennas are generally obtained by combi...
Claims
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IPC IPC(8): G01N22/02
Inventor 李鹏许万业段宝岩黄进宋立伟周金柱张逸群崔传贞
Owner XIDIAN UNIV