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An Accurate Method of Near-field Echo Acquisition

An acquisition method and near-field technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as failure to provide theoretical model verification, less quantitative calculation descriptions, etc., to achieve reliable data input and simplify the calculation process Effect

Active Publication Date: 2016-05-18
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 convincing theoretical model verification.
Especially for the influence of the antenna pattern and local illumination, there are few domestic and foreign literatures related to the near-field characteristics that give quantitative calculation descriptions

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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