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Spaceborne ka InSAR beamforming method based on dbf-tops weighting

A DBF-TOPS, beam technology, applied in the direction of radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., can solve the problem of constant change of echo angle of view

Active Publication Date: 2021-04-23
王辉
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Problems solved by technology

[0006] However, in the process of digital beamforming, since each sub-channel in the elevation direction works in TOPS mode, that is, in each group of Burst, the beam direction corresponding to each sub-receiving channel in the distance direction changes from back to front, so that the echo The angle of view is constantly changing, so it is necessary to consider the impact of beam pointing changes on the DBF weighted synthesis when performing DBF weighting, and the existing DBF weighting algorithm based on the strip mode is no longer applicable

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  • Spaceborne ka InSAR beamforming method based on dbf-tops weighting
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  • Spaceborne ka InSAR beamforming method based on dbf-tops weighting

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[0031] Hereinafter, the spirit and essence of the present invention will be further elaborated in conjunction with the drawings and embodiments.

[0032] Taking DBF with 4 sub-channels as an example, the DBF-TOPS InSAR signal processing flow mainly includes: (1) DBF weighting: carry out DBF weighting on the two antennas respectively in the range direction of the 4 TOPS sub-echoes, and through weighting processing, we can obtain One-way pencil-shaped high-gain TOPS echo; (2) TOPS imaging processing: Imaging processing is performed on the single-channel TOPS signal synthesized by DBF. Due to the subsequent interference processing, it is necessary to consider the phase preservation of the imaging algorithm during imaging. processing, the single-view complex image corresponding to the two antennas can be obtained; (3) Interferometric altimetry: Interferometric processing is performed on the complex image obtained by the two antennas, including image registration, interferometric ph...

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Abstract

The present invention provides a space-borne Ka InSAR beamforming method based on DBF-TOPS weighting, comprising: Step 1, establishing the baseband echo data expression that the radar obtains in a Burst data block; Step 2, establishing the weighting coefficient ω n (τ) expression; step 3, calculating and forming beams; step 4, performing Fourier transform on the formula of step 3; step 5, calculating frequency domain weighting coefficients; step 6, calculating weighted signal frequency domain expressions.

Description

technical field [0001] The invention relates to space-borne SAR communication technology, in particular to a space-borne Ka InSAR beamforming method based on DBF-TOPS weighting. Background technique [0002] Ka-band SAR has the characteristics of short wavelength, weak penetrability, and strong reflection, so the acquired SAR image texture and target subtle features are clearer; but its weak penetrability is unfavorable for land surface surveying and mapping. Since the sea surface is not blocked and the Ka-band reflectivity is strong, the Ka-band InSAR has obvious advantages in sea surface height measurement. Compared with the Ku-band used by traditional altimeters (such as Skylab, Seasat-A, ERS-1 / 2, Jason-1, TOPEX, etc.), the Ka-band ionospheric attenuation delay is low and can basically be ignored. The foreign Saral / AltiKa altimeter uses the Ka band for the first time, but limited by its bottom-looking working mode, the observation width is very narrow, usually only in th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 王辉
Owner 王辉