Radar target back scattering simulation method influenced by Faraday rotation changes

A technique of backscattering, simulation methods, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.

Active Publication Date: 2014-05-14
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0007] Therefore, the current research on the influence of Faraday rotation on SAR mainly focuses on the influence of Faraday rotation...

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  • Radar target back scattering simulation method influenced by Faraday rotation changes
  • Radar target back scattering simulation method influenced by Faraday rotation changes
  • Radar target back scattering simulation method influenced by Faraday rotation changes

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Embodiment Construction

[0031] The method for simulating the backscattering of a radar target affected by Faraday rotation changes according to the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] figure 1 It is a schematic diagram of the change of ionospheric data TEC value with time in the simulation method according to the present invention. Depend on figure 1 It can be known that the TEC value of the ionosphere changes during the synthetic aperture time of 15 minutes or longer, so the Faraday rotation angle caused by the ionosphere changes within the synthetic aperture time, that is, the radar target backscatter coefficient within the synthetic aperture time is Changes, which will affect the SAR focus imaging. For this reason, the present invention can add arbitrary Faraday rotation changes to the influence on the backscattering characteristics of different radar targets, and can quantitatively analyze the influen...

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Abstract

The invention provides a radar target back scattering simulation method influenced by Faraday rotation changes. The method comprises the steps of obtaining four complete polarization SAR compound images of an identical scene after various error influences are calibrated; obtaining a polarization scattering matrix S of a target; calculating a Faraday rotating angle omega caused by an ionized layer TEC value of each impulse transmission moment; calculating a polarization scattering matrix O influenced by the Faraday rotation changes; obtaining a back scattering coefficient influenced by the Faraday rotation changes; putting the back scattering coefficient influenced by the Faraday rotation changes into an SAR echo expression to carry out imaging processing and corresponding analysis. Through the adoption of the method, any influence on the back scattering coefficient and SAR imaging by the Faraday rotation changes can be simulated. In addition, radar target back scattering coefficients influenced by the Faraday rotation changes can be simulated easily and effectively based on existing SAR images.

Description

technical field [0001] The invention relates to the field of target scattering characteristics and the field of SAR imaging, and belongs to the field of target electromagnetic scattering, ionosphere influence on SAR signal and SAR signal processing field, in particular, relates to a radar target backscattering simulation affected by Faraday (Faraday) rotation changes method. Background technique [0002] The scattering characteristics of the target are related to the polarization of the electromagnetic wave. The elements in the polarization scattering matrix are the co-polarized backscattering coefficient of the target and the cross-polarized backscattering coefficient of the target, and there is no The backscatter coefficient of the target. [0003] Different targets respond differently to the polarization characteristics of electromagnetic waves. [0004] The ionosphere is a partly ionized region in the earth’s atmosphere, extending from about 50km above the ground to ab...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/4052G01S13/90G01S13/9076
Inventor 王旭艳王伟伟赵泓懿朱雅琳李财品李光廷黎薇萍刘波
Owner XIAN INSTITUE OF SPACE RADIO TECH
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