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Ionized layer irregular shape body diffraction imaging method based on p band satellite borne synthetic aperture radar (SAR)

An imaging method and ionospheric technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, radio wave measurement system, etc., can solve the problems of large amount of calculation and storage, and solve the problem of large amount of calculation and storage , the effect of simple method

Inactive Publication Date: 2013-04-10
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to disclose a method of diffraction imaging of ionospheric irregularities based on P-band spaceborne SAR, which combines radar signal processing and diffraction imaging to image ionospheric irregularities to solve the problem of large calculation and storage capacity. question

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  • Ionized layer irregular shape body diffraction imaging method based on p band satellite borne synthetic aperture radar (SAR)
  • Ionized layer irregular shape body diffraction imaging method based on p band satellite borne synthetic aperture radar (SAR)
  • Ionized layer irregular shape body diffraction imaging method based on p band satellite borne synthetic aperture radar (SAR)

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Embodiment Construction

[0033] The present invention is an ionospheric irregularity diffraction imaging method based on P-band spaceborne SAR. Then use SAR imaging to determine the approximate range of the target and greatly reduce the range of the imaging interval. Finally, the relationship between the scattered field and the ionospheric electron density is established according to the electric field integral equation, and the irregular body is imaged by the diffraction imaging method.

[0034] At first, the P band spaceborne SAR parameter in the method of the present invention is provided, specifically as follows:

[0035] (1) Flight altitude H of spaceborne SAR: The flight altitude of spaceborne SAR is generally between hundreds of kilometers and thousands of kilometers. In this paper, H is taken as 600 kilometers.

[0036] (2) The height h of the ionospheric irregularity: According to the previous analysis, h is selected as the height of the bottom layer of the ionosphere. According to the defin...

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Abstract

The invention discloses an ionized layer irregular shape body diffraction imaging method based on p band satellite borne synthetic aperture radar (SAR), and relates to a radar imaging technique. The steps are as follows. (1). An ionized layer signal is separated from a time domain echo signal of satellite borne p band SAR. (2). SAR diffraction imaging is used to confirm a rough range and a location of a target. (3). The relationship between radar echo and ionized layer electron density is built according to an electric-field integral equation. (4). Diffraction imaging method is used to image an irregular shape body. The ionized layer irregular shape body diffraction imaging method based on p band satellite borne SAR is simple and easy, and solves a problem of a big calculated amount and a big storage volume in an ionized layer irregular shape body diffraction imaging method.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to a diffraction imaging method for medium-scale irregular bodies (hundreds of meters to tens of kilometers) in the ionosphere based on P-band spaceborne SAR. Background technique [0002] The signal of the spaceborne synthetic aperture radar passes through the ionosphere, and its echo signal must carry the dual information of the ionosphere and ground targets, especially the ionosphere information carried in the echo signal of the P-band spaceborne SAR radar is extremely rich; these information Can be used for imaging of ionospheric irregularities. [0003] Irregular electron density in the ionosphere will cause radio signal flicker, resulting in random fluctuations in signal amplitude, phase, polarization state and angle of arrival. Among them, ionospheric scintillation has a particularly serious impact on P-band satellite-ground link communications and radar signals. Stron...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 李芳李廉林郑虎
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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