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Method for acquiring target scattering data in circular scanning mode

A technology of circular scanning and target scattering, applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of measurement deviation, unsatisfactory measurement system, difficulties, etc., and achieve the effect of broadening the application range

Inactive Publication Date: 2018-11-02
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

Obviously, the near-field response can also be reversely calculated from the far-field scattering of the target from this relationship, but due to the imperfection of the measurement system, there will be a serious deviation between the expected target quantity and the test quantity measured by the system
If we use this method to directly obtain the near-field characteristics of the target, we will rely heavily on the theoretically challenging deconvolution and signal restoration methods. Therefore, it is difficult to obtain the near-field scattering characteristics of the target by directly inverting the forward convolution relationship.

Method used

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  • Method for acquiring target scattering data in circular scanning mode
  • Method for acquiring target scattering data in circular scanning mode
  • Method for acquiring target scattering data in circular scanning mode

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Embodiment 1

[0037] Such as figure 1 As shown, the method for acquiring target scattering data in the circular scanning mode provided by the embodiment of the present invention includes:

[0038] Step S101, acquiring the near-field frequency-domain scattering data of the target in the circular scanning mode;

[0039] figure 2 is the target scattering model, r is the position of the antenna (transmitting and receiving co-location), r' is the position of the scattering point, γ(r') is the three-dimensional scattering rate distribution function of the target, and R is the absolute distance between the scattering point and the transmitting and receiving antenna. According to the principle of electromagnetics, when the antenna illuminates the target, the incident field at the scattering point is

[0040]

[0041] The above formula is the point source Green's function in three-dimensional space, and the scattering of the image point is equivalent to the secondary radiation. The single-stat...

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Abstract

The invention relates to a method for acquiring target scattering data in a circular scanning mode. The method belongs to the technical field of scattering measurement. The specific implementation manner of the method comprises the steps of: acquiring near-field frequency domain scattering data of a target in the circular scanning mode; performing inverse Fourier transform on the near-field frequency domain scattering data to determine near-field distance domain scattering data of the target; determining far-field distance domain scattering data of the target according to the near-field distance domain scattering data; and determining far-field frequency domain scattering data of the target according to the far-field distance domain scattering data of the target. The method can avoid the deconvolution problem of transforming from far-field scattering to near-field scattering, calculates a near-field scattering response reversely by means of far-field scattering, and expands the application range of the scattering test.

Description

technical field [0001] The invention relates to the technical field of scattering measurement, in particular to a method for acquiring target scattering data in a circular scanning mode. Background technique [0002] With the continuous improvement of radar frequency, the far-field conditions required for the test of electrically large-scale targets are becoming more and more difficult to meet. The measurement thus performed is only a kind of near-field scattering measurement. At this time, the output of the test system cannot represent the realness of the target. Scattering characteristics, the near-field test of scattering characteristics requires correlation transformation of the collected signals to obtain the real far-field scattering characteristics of the target. [0003] For fighter air combat, terminal guidance radar and radio fuze, what is encountered is the problem of near-field scattering. If the far-field RCS of the target is known, the characteristics of the a...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 高超吕鸣肖志河白杨
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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