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Multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method

A conversion method and plane wave technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of unpublished decomposition of one-dimensional single-station RCS near-far field conversion methods, and inability to use one-dimensional single-station RCS near-far field conversion, etc. Achieve the effect of simplifying the near-field test system and avoiding the use of positioning equipment

Active Publication Date: 2016-03-02
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

Another foreign paper introduces the multi-layer plane wave decomposition near-far field conversion method, but this method cannot be used for one-dimensional single-station RCS near-far field conversion
In summary, the prior art does not disclose a one-dimensional single-station RCS near-far field conversion method based on multi-layer plane wave decomposition

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  • Multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method
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  • Multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method

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Embodiment Construction

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0016] Such as figure 1 Shown is the flow chart of the one-dimensional single-station RCS near-far field conversion algorithm based on multi-layer plane wave decomposition in the present invention. Calculation method principle of the present invention is as follows:

[0017] Based on the first-order Born approximation and single station setting, the radiation reflection model of the incident field and the scattered field is established; according to the addition theorem and the flat body characteristics of the target, the above radiation reflection model is expanded by multi-layer plane waves and converted into a plane wave spectrum on the unit circle Integral of ; matrix equation solving using the conjugate gradient method.

[0018] The calculation steps are as follows:

[0019] Step 1: Determine the sampling plane of the near-field scattering data...

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Abstract

The invention relates to a multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method. The method includes the following steps that: multilayer planar waves for a target scattering near field are expanded according to the addition theorem, and the expanded multilayer planar waves are written into the integral of a transfer operator and a target reflectance pattern function on a unit angular spectrum sphere; and surface integral is simplified into circulation integral according to the flat body characteristics of a target, and the transfer operator is truncated according to precision required to be achieved by the algorithm, and matrix inversion is carried out through using a conjugate gradient method capable of rapid convergence. According to the method of the invention, near-field one-dimensional single-station scattering data are converted into far-field scattering data through a multilayer plane wave decomposition fast algorithm, and therefore, non-margin sampling can be realized. The method of the invention has the advantages of fast near-to-far field transformation, automatic antenna pattern compensation, automatic sampling position compensation and controllability in error, and can guide near-field sampling setting. The multilayer plane wave decomposition-based one-dimensional single-station RCS (radar cross section) near-to-far field transformation method is a fast and convenient method for obtaining a target RCS (radar cross section).

Description

technical field [0001] The invention relates to the field of target electromagnetic scattering and inverse scattering, in particular to a one-dimensional single-station RCS near-far field conversion method for electromagnetic scattering. Background technique [0002] The target RCS test needs to meet the far-field conditions. At present, the more mature methods include the far-field flat-field test and the compact-field test. However, for the RCS test of electrically large-scale targets, the far-field flat field requires huge test site support, and the compact field requires the construction of expensive reflective surface facilities. In recent years, the RCS near-field test technology has been actively developed, and the test is carried out in the near-field that does not meet the far-field conditions, and then the target RCS is obtained through near-far field conversion, which is cheap and convenient. The near-far field conversion method is the key to the above near-field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 贺新毅童广德徐秀丽王晓冰
Owner SHANGHAI RADIO EQUIP RES INST
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