Comparison of Topography- and Aperture-Dependent Motion Compensation Algorithms for Airborne SAR

Prats, Pau; Macedo, Karlus; Reigber, Andreas; Scheiber, Rolf; Mallorquí, J.J.

doi:10.1109/lgrs.2007.895712

Cited by 127 publications

(70 citation statements)

References 12 publications

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“…Since the bulk MOCO has been researched a lot in [18][19][20][21][22][23][24][25][26], here it is only simply mentioned for deriving the following residual error discussion.…”

Section: Principle Of the Bulk Mocomentioning

confidence: 99%

“…Assuming that the motion error is known as a priori information, then the next step is to compensate the errors; based on some previous researches on this topic [18][19][20][21][22][23][24][25][26], a widely used algorithm is bulk MOCO. The algorithm is implemented in two steps to compensate the range-independent and range-dependent motion errors respectively [27].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Along-Track Motion Compensation for Strip-Map Sar Based on Resampling

Ma¹,

Bai²,

Liang³

et al. 2014

PIER M

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Abstract-The airborne or vehicle-based SARs are very vulnerable to the influences of airflows or road conditions so as to deviate from the predicted trajectory, which undermines the uniformity of the azimuth sampling. As a result, the SAR image quality can get impaired in varying degrees. Since the SAR systems are sensible to the track deviation, the motion compensation (MOCO) algorithms are always applied as pre-processing of SAR raw data. In this paper, mainly with regard to the motion error caused by the forward velocity variation, a 'resampling MOCO' algorithm is proposed as an auxiliary of the widely used bulk MOCO. The simulation result has verified that the performance of the fundamental bulk MOCO algorithm is greatly improved utilizing the proposed method.

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“…Since the bulk MOCO has been researched a lot in [18][19][20][21][22][23][24][25][26], here it is only simply mentioned for deriving the following residual error discussion.…”

Section: Principle Of the Bulk Mocomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Along-Track Motion Compensation for Strip-Map Sar Based on Resampling

Ma¹,

Bai²,

Liang³

et al. 2014

PIER M

View full text Add to dashboard Cite

show abstract

“…The errors induced by this approximation are detailed in [21]. A number of methods have been proposed as alternatives to this approximation, as discussed in [22]. When using this approximation, we apply the correction filter (10) to the raw data.…”

Section: B Simplifying Approximationsmentioning

confidence: 99%

Theory and Application of Motion Compensation for LFM-CW SAR

Zaugg

Long

2008

IEEE Trans. Geosci. Remote Sensing

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Abstract-Small low-cost high-resolution synthetic aperture radar (SAR) systems are made possible by using a linear frequency-modulated continuous-wave (LFM-CW) signal. SAR processing assumes that the sensor is moving in a straight line at a constant speed, but in actuality, an unmanned aerial vehicle (UAV) or airplane will often significantly deviate from this ideal. This nonideal motion can seriously degrade the SAR image quality. In a continuous-wave system, this motion happens during the radar pulse, which means that existing motion compensation techniques that approximate the position as constant over a pulse are limited for LFM-CW SAR. Small aircraft and UAVs are particularly susceptible to atmospheric turbulence, making the need for motion compensation even greater for SARs operating on these platforms. In this paper, the LFM-CW SAR signal model is presented, and processing algorithms are discussed. The effects of nonideal motion on the SAR signal are derived, and new methods for motion correction are developed, which correct for motion during the pulse. These new motion correction algorithms are verified with simulated data and with actual data collected using the Brigham Young University μSAR system.

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“…Besides, the original MOCO methods only take range-dependent motion error into account, and the residual azimuth-dependent motion error should also be considered, which is nonignorable for high-resolution airborne MMW SAR imaging with wide swath. The existed azimuth-dependent MOCO algorithms [14][15][16][17][18] could precisely compensate the azimuth-dependent motion error and modify the azimuth matched filtering function in order to eliminate the influence of azimuth-variant motion error.…”

Section: Introductionmentioning

confidence: 99%

Range cell migration correction analysis of one-step and two-step motion compensation for millimeter-wave airborne SAR imaging

Wang

Zhang

et al. 2016

EURASIP J. Adv. Signal Process.

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Conventional two-step motion compensation (MOCO) method is widely adapted for airborne synthetic aperture radar (SAR) imaging due to its conciseness combining with the SAR focusing procedure. For two-step MOCO, rangeindependent compensation is processed before range cell migration correction (RCMC), and the range-dependent phase correction is implemented after RCMC. However, the accuracy of RCMC would be seriously decreased by the residual range-dependent phase, which is a fatal problem for high-resolution millimeter-wave (MMW) SAR imaging. In this paper, an extensive investigation on the RCMC accuracy is provided by establishing an accurate formula expression between the range cell migration error and the residual range-dependent phase error. One-step MOCObased SAR imaging algorithm is investigated by compensating the range-dependent motion error before RCMC, so the presence of range cell migration error would be significantly suppressed. What is more, a modified azimuth match filtering (AMF) function is given by precise topography and aperture-dependent motion compensation (PTA) method to overcome the residual azimuth-dependent phase error in the azimuth compression stage. Both simulated and real-measured MMW SAR data sets are used to validate the analysis for high-resolution airborne SAR imaging.

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Comparison of Topography- and Aperture-Dependent Motion Compensation Algorithms for Airborne SAR

Cited by 127 publications

References 12 publications

Along-Track Motion Compensation for Strip-Map Sar Based on Resampling

Along-Track Motion Compensation for Strip-Map Sar Based on Resampling

Theory and Application of Motion Compensation for LFM-CW SAR

Range cell migration correction analysis of one-step and two-step motion compensation for millimeter-wave airborne SAR imaging

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