A method for accurately acquiring near field echo

An acquisition method and near-field technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of less quantitative calculation description and failure to give theoretical model verification.

Active Publication Date: 2014-03-26
中国航天科工集团第二研究院二〇七所
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Problems solved by technology

In recent years, some units have successively carried out the research on the modeling method of the near-field echo of complex targets, and achieved certain results, but failed to fully consider the influence of these aspects, and failed to give a co

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  • A method for accurately acquiring near field echo
  • A method for accurately acquiring near field echo
  • A method for accurately acquiring near field echo

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Such as figure 1 As shown, a kind of accurate near-field echo acquisition method described in the present invention comprises the following steps:

[0049] Step 1: Establish the target coordinate system O-XtYtZt, the antenna coordinate system O-XaYaZa, and the scattering unit coordinate system O-XmYmZm, such as figure 2 shown;

[0050] Step 2: Obtain the field incident on the mth scattering unit on the surface of the scatterer;

[0051] Considering the characteristics of the near-field, on the surface of the scatterer, the near-field incident wave is expressed as a spherical wave, figure 2 The field intensity incident to the mth scattering unit in is:

[0052] E im = P i D ...

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Abstract

The invention belongs to technical field of signal characteristic control and specifically relates to a method for accurately acquiring near field echo. The method comprises following steps of: a step 1, establishing a target coordinate system O-XtYtZt, an antenna coordinate system O-XaYaZa, and a scattering unit coordinate system O-XmYmZm; a step 2, acquiring a field incident on a mth scattering unit from the surface of a scattering body; a step 3, acquiring scattered fields of the scattering units; a step 4, acquiring a scattered field of the mth scattering unit received by a receiving antenna; a step 5, superposing the scattered fields of each scattering unit received by the receiving antenna in order to acquire a total scattered field; and a step 6, calculating the total scattered field so as to acquire near field echo intensity and power characteristics. The method establishes a complex target near field scattering model with a PO+PTD+GP method and introduces a concept of near field polarization scattering matrix so as to express scattering properties with different mechanisms by using a unified expression, thereby simplifying a calculating process.

Description

technical field [0001] The invention belongs to the technical field of signal feature control, and in particular relates to an accurate near-field echo acquisition method. Background technique [0002] The finalization and operation of anti-aircraft missile weapon systems are often troubled by the non-activation or false activation of the radio fuze system. To determine the optimal activation point and activation area of ​​the fuze, it is necessary to study the near-field echo characteristics of the target. The acquisition of near-field echo characteristics needs to fully consider the characteristics of near-field scattering, such as the influence of antenna pattern, spherical wave, distance, local illumination, polarization, etc., and the accuracy of its theoretical model must be tested in the near-field of complex targets The verification of the data can only be confirmed. In recent years, some units have successively carried out the research on the modeling method of the...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/354G01S7/4052
Inventor 崔燕杰陈文强张向阳郑建平樊正芳
Owner 中国航天科工集团第二研究院二〇七所
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