DCS algorithm-based satellite-borne video SAR (synthetic aperture radar) imaging processing method

An imaging processing and video technology, applied in the field of signal processing, can solve the problem of not only considering the resolution requirements, and achieve the effect of ensuring consistency, simple and flexible operation, and automatic calculation of overlapping methods and overlapping rates.

Active Publication Date: 2015-09-23
BEIHANG UNIV
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Problems solved by technology

[0004] However, the imaging processing of spaceborne video SAR is quite different from the traditional spaceborne SAR mode. It cannot only consider the resolution requirements. In order to meet the fluency and consistency of subsequent video product pictures, it is also necessary to Registration problem between frame images

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  • DCS algorithm-based satellite-borne video SAR (synthetic aperture radar) imaging processing method
  • DCS algorithm-based satellite-borne video SAR (synthetic aperture radar) imaging processing method
  • DCS algorithm-based satellite-borne video SAR (synthetic aperture radar) imaging processing method

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Embodiment

[0077] A kind of space-borne video SAR imaging processing method based on DCS algorithm of the present invention, specifically:

[0078] Step 1: Read in the echo simulation data S(τ,t;r) of the spaceborne SAR sliding spotlight mode and the corresponding imaging parameters, including: the number of sampling points N in azimuth a =32768, the number of sampling points N in the distance direction r =2048, signal sampling rate f s =270MHz, signal bandwidth Bw=220MHz, pulse repetition frequency PRF=9000Hz, reference slope distance R ref =613.7km, Doppler center frequency f d0 = 16.7Hz, Doppler modulation frequency f r0 =21305.2Hz / s, equivalent speed V=7691m / s, signal wavelength λ=0.008m4, light speed c=3×10 8 m / s;

[0079] Step 2: Determine the azimuth resolution ρ a =2m, to obtain the Doppler bandwidth B needed to realize a frame of image with corresponding azimuth resolution a =3165Hz, the synthetic aperture time is 0.314s, and the method is as shown in formula (1)(2);

[...

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Abstract

The invention discloses a DCS algorithm-based satellite-borne video SAR (synthetic aperture radar) imaging processing method. The method includes the following steps that: 1, satellite-borne SAR beam bunching mode echo simulation data and corresponding parameters are read; 2, Doppler bandwidth and synthetic aperture time required by frame images are determined; 3, a data partitioning mode is determined, and data are partitioned; 4, de-sloping processing is performed on frame segment data in an azimuth direction; 5, signals obtained after the de-sloping processing are subjected to azimuth-direction Fourier transform, multiplied by an CS factor, subjected to range-direction Fourier transform, and multiplied by a range-direction compensation factor sequentially; 6, the phase difference between the center slope distance of each frame of data and the center slope distance of the entire echo data is compensated; 7, range-direction Fourier transform, azimuth-direction compensation processing, azimuth-direction inverse Fourier transform are performed, so that an imaging result can be obtained; 8, step 4 to step 7 are repeated, so that all frame images can be obtained; and a video SAR product can be obtained. With the DCS algorithm-based satellite-borne video SAR imaging processing method of the invention adopted, the resolutions of the frame images can be consistent.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a DCS algorithm-based spaceborne video SAR (Synthetic Aperture Radar) imaging processing method. Background technique [0002] Spaceborne SAR is an advanced space-based information acquisition payload and an important means of information acquisition. Compared with optical sensors, spaceborne SAR can overcome the limitations of cloud, fog, rain, snow and dark night conditions to image ground targets, and realize all-day, all-weather, high-resolution, large-scale surface-to-ground observation. , Disaster monitoring, resource exploration, geological surveying and mapping, government public decision-making and other aspects have a wide range of applications. In many cases, it can play a role that cannot be replaced by other space remote sensing means. [0003] However, the traditional spaceborne SAR working mode can only obtain static images, and there are deficiencies in the dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9004
Inventor 陈杰赵松涛杨威王亚敏
Owner BEIHANG UNIV
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