Modification of the Recursive Sidelobe Minimization Technique for the Range-Doppler Algorithm of SAR Imaging

Woo, Jae-Choon; Lim, Byoung-Gyun; Kim, Y.-S.

doi:10.1163/156939311797453926

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…Select one channel as a reference channel, and calculate the equalizer in the closed loop before experiment sampling Then utilize the equalizer to compensate the frequency response difference of receiver channels by raw data. This step will reduce the sidelobe [28,38] for the small time-bandwidth chirp signal at the same time [39].…”

Section: The Coherence Improving Algorithmmentioning

confidence: 99%

Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

Fan¹,

Huang²,

Jin³

et al. 2012

PIER

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Abstract-The coherence between the complex image pair from two channels is important for improving the capability of alongtrack interferometry (ATI) processing in synthetic aperture radar (SAR) ground moving target indication (GMTI). The along-track dual-channel low frequency SAR can be easily influenced by not only mismatch errors of the image pair but also the radio frequency interference (RFI). RFI has great impacts on the joint probability density function (PDF) of magnitude and phase in the interferometric image. However, little work has been done to investigate the coherence improvement under RFI. This study develops an algorithm to improve the coherence of the image pair for along-track dual-channel low frequency SAR, which can be used by ATI. After analyzing RFI imaging in detail, it is proposed that the along-track interferometric image in the range frequency and cross-range slow time domain can be used to detect RFI. Median filters are proposed to further suppress RFI. This suppression has the same implementations to the image pair without heavy computation load. Considering RFI suppression and mismatch errors compensation, a pre-processing flow is proposed to achieve high coherence of the interferometric image in low frequency SAR. It is shown that the coherence of the complex image pair can be improved greatly by using this pre-processing flow. The effectiveness of this algorithm is demonstrated with real data acquired by an airborne along-track dual-channel P-band SAR GMTI system.

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Section: The Coherence Improving Algorithmmentioning

confidence: 99%

Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

Fan¹,

Huang²,

Jin³

et al. 2012

PIER

View full text Add to dashboard Cite

show abstract

“…Hitherto, there have still been many SAR technologies needed to be refined to achieve better system performances and image processing, e.g., two-dimensional sidelobe reduction [1], Automatic Target Recognition (ATR) [2,3], sparse reconstruction with limited information available [4], etc. Also, its basic function of twodimensional imaging has been extended to include many branches of SAR family, e.g., Polarimetric SAR (PolSAR) [5], multiband SAR [6], bistatic SAR [7,8], Multi-Input Multi-Output SAR (MIMO SAR) [9], and Interferometry SAR (InSAR).…”

Section: Introductionmentioning

confidence: 99%

The Interferometry Phase of Insar Coherent Jamming With Arbitrary Waveform Modulation

Liu¹,

Xing²,

Wang³

et al. 2012

PIER

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Abstract-This paper focuses on the interferometry phase of an active coherent jamming in InSAR (Interferometry Synthetic Aperture Radar) images. Based on the signal models of coherent jammer, the jamming's imaging results are derived by employing the Omega-K algorithm. By comparing the imaging results of InSAR's two channels, the jamming's interferometry phases for both working modes, the single-pass and repeat-pass modes, are proved to be constants. And the values of the interferometry phases are determined by the jammer's geometry position relative to InSAR baseline, but independent of the jamming's waveform modulation and its background terrain.

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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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Modification of the Recursive Sidelobe Minimization Technique for the Range-Doppler Algorithm of SAR Imaging

Cited by 13 publications

References 18 publications

Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

The Interferometry Phase of Insar Coherent Jamming With Arbitrary Waveform Modulation

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

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