2017
DOI: 10.3390/s18010043
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Sliding Spotlight Mode Imaging with GF-3 Spaceborne SAR Sensor

Abstract: Synthetic aperture radar (SAR) sliding spotlight work mode can achieve high resolutions and wide swath (HRWS) simultaneously by steering the radar antenna beam. This paper aims to obtain well focused images using sliding spotlight mode with the Chinese Gaofen-3 SAR sensor. We proposed an integrated imaging scheme with sliding spotlight echoes. In the imaging scheme, the two-step approach is applied to the spaceborne sliding spotlight SAR imaging algorithm, followed by the Doppler parameter estimation algorithm… Show more

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Cited by 7 publications
(8 citation statements)
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References 24 publications
(37 reference statements)
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“…Theoretical analysis has been validated by simulation results. Our future work includes exploiting the advantages of the scheme by using a practical airborne MIMO-SAR system in wide-swath spotlight and 3D imaging [ 19 , 20 ].…”
Section: Discussionmentioning
confidence: 99%
“…Theoretical analysis has been validated by simulation results. Our future work includes exploiting the advantages of the scheme by using a practical airborne MIMO-SAR system in wide-swath spotlight and 3D imaging [ 19 , 20 ].…”
Section: Discussionmentioning
confidence: 99%
“…First, to deal with the wide Doppler bandwidth of the sliding mode data, an azimuth convolution process in the space domain is preceded before performing the FSA. Convolution with the selected chirp signal to avoid aliasing is a widely used technique in full-aperture spotlight SAR processing [27][28][29][30][31], [35][36][37][38][39]. A new signal model is derived after the preliminary azimuth convolution since the dechirped signal model is addressed in this paper.…”
Section: Proposed Full-aperture Frequency Scaling Algorithm For Dechi...mentioning
confidence: 99%
“…This feature produces SAR images with a higher azimuth resolution than the stripmap mode and a wider azimuth extent than the staring mode. Due to these properties, the sliding mode is widely used as one of the main operating modes of modern SAR satellites, such as TerraSAR-X and Gaofen-3 [26][27][28][29]. Accordingly, extensive research has been conducted on the processing of sliding mode SAR data [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Spaceborne synthetic aperture radar (SAR) systems play a vital role in tasks like regional mapping, geophysical parameter inversion, and disaster assessment thanks to their all-weather, day-and-night, long-endurance imaging capabilities with fine resolutions [1][2][3][4][5]. In the sliding spotlight SAR mode, the azimuth resolution is improved using azimuth beam scanning, which enlarges the Doppler bandwidth [6,7]. The adjustable squint angle in the squinted spotlight mode provides more flexibility in multi-angle observations and rapid target revisits within one orbital pass [8][9][10][11].…”
Section: Introductionmentioning
confidence: 99%