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Low-waveband ISAR (Inverse Synthetic Aperture Radar) ionized layer correction method based on sub-band segmentation

An ionospheric correction and ionospheric technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, and re-radiation, etc., can solve problems such as normal imaging, and achieve the effect of improving imaging effects and image contrast.

Inactive Publication Date: 2016-11-23
HEFEI UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-band ISAR ionospheric correction method based on subband segmentation, to solve the problem that the prior art cannot normally image when there is ionospheric interference, and the proposed correction method can effectively remove the ionosphere in the signal error, restore the interference-free data, and improve the imaging effect of radar images

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  • Low-waveband ISAR (Inverse Synthetic Aperture Radar) ionized layer correction method based on sub-band segmentation
  • Low-waveband ISAR (Inverse Synthetic Aperture Radar) ionized layer correction method based on sub-band segmentation
  • Low-waveband ISAR (Inverse Synthetic Aperture Radar) ionized layer correction method based on sub-band segmentation

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[0035] A low-band ISAR ionospheric correction method based on subband segmentation, including the following steps:

[0036] Step 1: sub-band segmentation. Convert the corrected data of distance pulse pressure and distance walking to the distance frequency domain-azimuth time domain, divide the range signal bandwidth into range sub-bands; then divide the echo data into multiple azimuth sub-apertures according to the azimuth synthetic aperture time ;

[0037] Step 2: Ionospheric interference error calculation. In the distance time domain and azimuth time domain, mark the position of each azimuth slow time echo pulse pressure peak of each block of data, and then multiply the average value of the peak position in the block by the size of the distance resolution unit to obtain the block data Corresponding residual slope distance error;

[0038] Step 3: Error correction and signal recovery. By comparing the fitting polynomial and deriving polynomial, the ionospheric parameters c...

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Abstract

The invention discloses a low-waveband ISAR (Inverse Synthetic Aperture Radar) ionized layer correction method based on sub-band segmentation. For data corrected by range pulse pressure and range walking, two dimensions including range direction signal bandwidth and direction synthetic aperture time are used for dividing echoed data into a plurality of sub data blocks. According to a relationship between ionized layer interference and signal slope distance, a residual slope distance error obtained by estimation fitting calculation is used for deducing a corresponding ionized layer parameter so as to establish an ionized layer interference correction function. The echoed data and the correction function are multiplied to recover the echoed signal without ionized layer interference. While influence on a radar echoed signal by the ionized layer is effectively weakened, the imaging quality of the ISAR is further improved, and the effectiveness of the space target monitoring of low-waveband ISAR radar is reinforced.

Description

technical field [0001] The invention relates to the field of ISAR imaging signal compensation methods, in particular to a low-band ISAR ionospheric error correction method based on subband segmentation. Background technique [0002] Almost all SAR / ISAR imaging algorithms assume that the radar or target moves in an ideal path in vacuum, and the moving position and state of the radar or target are known precisely within the observation time. However, in the various processes of radar signal transmission, propagation, reception, and processing, there are various error interferences that affect the effect of the finally obtained radar image. [0003] The electromagnetic waves emitted by the radar are interfered by the earth's atmosphere and the earth's ionosphere during space propagation, causing adverse effects such as image offset, geometric distortion, and resolution reduction in imaging quality. As early as the middle of the 20th century, NASA, European Space Agency, etc. h...

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Application Information

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IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40G01S13/90G01S13/9064
Inventor 周芳杨学志夏天夏晶凡
Owner HEFEI UNIV OF TECH
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