Interferometric Properties and Processing for Spaceborne Spotlight Sar

Ren, Xiaozhen; Qin, Yao; Qiao, and Li Hong

doi:10.2528/pierb11090609

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…γ(r) slightly varies with r, leading to azimuth resolution ρ a (r) changes with r, which was neglected in [6][7][8][9][10][18][19][20][21][22]. Moreover, this phenomenon was considered in the following analysis, and some significant conclusions were deduced based on the modified UMC.…”

Section: Discussionmentioning

confidence: 99%

“…In order to satisfy the requirements from recent remote sensing applications, most currently advanced spaceborne SAR sensors have multiple imaging modes to implement high-resolution and wide-swath Earth observation capability, which may operate at both conventional SAR modes, including stripmap mode, ScanSAR mode as well as spotlight mode, and state-of-the-art SAR modes, including sliding spotlight mode, TOPS (Terrain Observation by Progressive Scans) mode and inverse TOPS mode et al [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Three-Step Image Formation Scheme for Unified Focusing on Spaceborne Sar Data

Yang¹,

Chen²,

Zeng³

et al. 2013

PIER

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Abstract-Current advanced spaceborne synthetic aperture radar (SAR) systems may operate at multiple imaging modes, including conventional modes as stripmap, ScanSAR and spotlight, as well as the state-of-the-art SAR modes, e.g., sliding spotlight, TOPS (Terrain Observation by Progressive Scans) and inverse TOPS etc. A novel image formation scheme for unified processing spaceborne SAR data was proposed, which significantly simplified complexity of SAR processor sub-system. The unified-model-coefficient (UMC) was defined for modeling all SAR modes by means of analyzing both imaging geometry and time-frequency diagram corresponding to each imaging mode, respectively. The unified mathematical formula for modeling all SAR modes echo signal was derived as a function of UMC. Consequently, a unified image formation scheme for accurately focusing spaceborne SAR data in an arbitrary mode was proposed, which integrates all of SAR image formation procedures into a standard three-step processing framework, namely, de-rotation, data focusing and re-sampling, which evidently improve efficiency and robustness of data processing sub-system. Computer simulation experiment results verify the effectiveness of the proposed scheme.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Three-Step Image Formation Scheme for Unified Focusing on Spaceborne Sar Data

Yang¹,

Chen²,

Zeng³

et al. 2013

PIER

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“…However in order to obtain a correct height measurement we need the absolute interferometric phase, φ I (r, d). The absolute phase difference can be obtained by phase unwrapping [25,26]. However traditional phase unwrapping algorithms that assume a continous phase surface are not directly applicable to InISAR images [12].…”

Section: Inisar Signal Processingmentioning

confidence: 99%

Interferometric Isar Imaging on Maritime Target Applications: Simulation of Realistic Targets and Dynamics

Felguera-Martin¹,

González-Partida²,

Burgos-García³

2012

PIER

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Abstract-ISAR imaging of maritime targets has greater success than other ISAR applications due to the constant oscillatory motions induced by waves and wind. However, relative target motions are usually unknown, difficult focusing, image interpretation and target classification. Using interferometry to obtain the height information makes possible to obtain a 3-D reconstruction of a target, aiding image focusing, image interpretation and target classification. However, the information and utility of the ISAR image and the interferometric information depends highly on geometry and targets dynamics. In this paper we will study the influence of movement dynamics in interferometric ISAR imaging using a realistic extended moving target simulation, a general geometry and complex dynamics models.

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“…Synthetic aperture radar (SAR) is an efficient radar imaging technology that provides two dimensional (2D) high resolution radar cross section (RCS) [1][2][3] of ground targets at a long range and has been used for many applications along with its inverse type ISAR [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The main idea of this technique is to obtain a long aperture enough to provide high cross-range resolution ∆y using a radar carried by a moving airborne vehicle.…”

Section: Introductionmentioning

confidence: 99%

“…The main idea of this technique is to obtain a long aperture enough to provide high cross-range resolution ∆y using a radar carried by a moving airborne vehicle. The widely used method for the fineresolution image of a localized region is the spotlight mode [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]; in this mode, the radar steers its antenna beam to continuously illuminate the imaged area. Among several SAR algorithms, the range migration algorithm (RMA) [4,14] is widely used because it is much faster and simpler than other algorithms due to its one-dimensional (1D) spectrum interpolation.…”

Section: Introductionmentioning

confidence: 99%

Motion Compensation for Squint Mode Spotlight Sar Imaging Using Efficient 2d Interpolation

Park¹,

Park²,

Kim³

2012

PIER

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Abstract-In the squint mode airborne spotlight synthetic aperture radar system using the range migration algorithm (RMA), autofocus (AF) technique yields poor results due to the squint spreading of the point spread function (PSF) of a scatterer. Thus, two-dimensional (2D) interpolation is required to direct PSF blurring in cross-range direction, to improve the cross-range resolution ∆y and to remove the spatially-varying sidelobe. Because conventional 2D interpolation requires huge computation time and yields large computation errors, we propose an efficient 2D interpolation technique for squint-mode RMA composed of two 1D interpolations. Simulation results using the measured turbulence data show ∆y was improved considerably and PSF was successfully focused by the proposed method with a reduced computation time.

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Interferometric Properties and Processing for Spaceborne Spotlight Sar

Cited by 6 publications

References 23 publications

A Novel Three-Step Image Formation Scheme for Unified Focusing on Spaceborne Sar Data

A Novel Three-Step Image Formation Scheme for Unified Focusing on Spaceborne Sar Data

Interferometric Isar Imaging on Maritime Target Applications: Simulation of Realistic Targets and Dynamics

Motion Compensation for Squint Mode Spotlight Sar Imaging Using Efficient 2d Interpolation

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