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Method for acquiring radar cross section

A technology of radar cross-sectional area and surface element integration, applied in the field of radar remote sensing, can solve the problems of inaccurate results of radar cross-sectional area and slow speed, and achieve the effect of high speed and high accuracy

Inactive Publication Date: 2009-07-08
CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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  • Application Information

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Problems solved by technology

The main advantage of the ray tracing method is that it is flexible in calculation and can calculate multiple reflections, but its main disadvantage is that it is slow and the result of the obtained radar cross-sectional area is not accurate

Method used

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  • Method for acquiring radar cross section
  • Method for acquiring radar cross section
  • Method for acquiring radar cross section

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Experimental program
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Embodiment

[0051] In this embodiment, the corner reflector is taken as an example, because the corner reflector is a relatively special scatterer, and it has a large scattering contribution in a large angle range due to the third scattering. Because of this property, corner reflectors are often used as calibration objects in radar remote sensing. Therefore, this paper also chooses the corner reflector, and verifies the effectiveness of modeling the scattering mechanism of multiple reflections using physical optics and geometric optics by calculating its scattering contribution.

[0052] The side length of the corner reflector in this embodiment is 13 times the wavelength of the ray, namely 13λ; the length of the other side is 5 times the wavelength of the ray, ie 5λ; a series of angles in the vertical and horizontal directions are respectively calculated. Comparing the final experimental results with the measurement results, the maximum error is within 2dB, indicating that the simulation...

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Abstract

The invention relates to radar remote sensing technology, in particular to a method for acquiring the cross section of radar. The method comprises the following steps: after parallel rays project to a target surface area element, acquiring a path parameter of each ray from incidence to reflection; according to the acquired path parameter of each ray from the incidence to the reflection, acquiring a reflection field of a projection plane of each ray; according to the acquired reflection field, acquiring a fringe field of the projection plane of each ray through an integration formula of the surface area element, namely S=shi No.S-[1]exp[jkr(i-s)]dS; and superposing the acquired fringe field of the projection plane of each ray. The method has the advantages of high speed and high accuracy, and contributes to simulation of high-frequency radar cross section with multi-angle, multi-frequency and multi-polarity, thereby realizing the simulation of a high-frequency radar image.

Description

technical field [0001] The invention relates to a radar remote sensing technology, in particular to a method for obtaining a radar cross-sectional area. Background technique [0002] In the field of radar applications, calculating the scattering of complex target objects plays an important role in obtaining the radar cross-sectional area of ​​the target object. There are a large number of accurate radar cross-sectional area estimation methods in the prior art, such as MOM, FEM, and FDTD. Although the accuracy of the radar cross-sectional area obtained by these methods is very high, they are only suitable for solving low-frequency regions and resonance regions. In the high-frequency region, the local interaction between objects and electromagnetic waves is very strong, so the existing technology mainly uses the ray tracing method to approximate the radar cross-sectional area of ​​complex targets. The so-called ray tracing method refers to judging the visible surface by traci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 王超温晓阳张红
Owner CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI