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A novel spaceborne SAR wide-swath imaging approach based on Poisson disk-like nonuniform sampling and compressive sensing

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Science China(Information Sciences) 2012年第8期55卷 1876-1887页

作者： SUN JinPing,ZHANG YuXi,TIAN JiHua&WANG Jun School of Electronic and Information Engineering,Beihang University,Beijing 100191,China School of Electronic and Information Engineering Beihang University Beijing China

Since the range swath width in the conventional single channel spaceborne synthetic aperture radar(SAR)is restricted by the system parameters,there is a trade-off between the azimuth resolution and the swath width in order to satisfy the Nyquist sampling *** this paper,we propose a novel spaceborne SAR wide-swath imaging scheme based on compressive sensing(CS)for the sparse *** proposed method designs a Poisson disk-like nonuniform sampling pattern in the azimuth direction,which meets the demand of wider swath by restricting the smallest time interval between any two azimuth samples,with the conventional sampling pattern preserved in the range *** a similar way to the processing procedure of spectral analysis(SPECAN)algorithm,the linear range migration correction(RMC)is realized while carrying out range compression,which can meet the demand for focusing with middle level *** reduce the computation load of CS reconstruction,we propose a novel fast reconstruction algorithm based on nonuniform fast Fourier transform(NUFFT),which greatly reduces the computation complexity from O(2M N)to O(4N log N).Experiment results validate the effectiveness of the proposed methods via the point target simulation and the Radarsat-1 raw data processing in F2 mode.

关键词： SAR wide-swath imaging compressive sensing NUFFT

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Conceptual rotational mode design for optical conical scanning imaging small satellites

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Science China(Technological Sciences) 2020年第8期63卷 1383-1395页

作者： WANG Feng XI RuiChen YUE ChengFei LI HuaYi CAO XiBin Research Center of the Satellite Technology Harbin Institute of TechnologyHarbin 150001China Institute of Space Science and Applied Technology Harbin Institue of TechnologyShenzhen 518055China

This paper focuses upon the novel optical conical scanning imaging working mode design for small *** kind of satellite employs only one inclined optical camera achieving wide-swath imaging via a rotational motion about the nadir axis either by the camera or by the *** working modes are designed,i.e.,high-speed rotational mode,low-speed rotational mode,and variable-speed rotational *** the high-speed and low-speed working modes,the camera rotates at a constant speed and the corresponding angular velocity is derived under the consideration of guaranteed coverage and minimized *** improve the system performance,an enhanced working mode taking advantages of both the high-speed rotational mode and lowspeed rotational mode is *** in this variable-speed rotational mode,the camera rotates slowly to get high-quality pictures when it works,while it rotates rapidly to reduce the energy consumption and save the storage during which period the camera is turned off to minimize the *** these working modes are illustrated in detail,and numerical simulation tests are conducted to validate their effectiveness.

关键词： remote sensing optical imaging wide-swath imaging conical scanning small satellite

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