An Iterative Method for Ocean Surface Current Retrieval by Along-track Interferometric SAR

Yu, Xiangzhen; Chong, Jong‐Wha; Wen, Hong

doi:10.3724/sp.j.1146.2012.00381

Cited by 4 publications

(6 citation statements)

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“…When the velocity is 2m/s and the direction is 0 • , the minimum direction error is 8 • , and the maximum direction error indicated by the dark red at the bottom in Figure 11 (b) reaches 180 • , which is completely unable to represent the true current direction. Then, it is assumed that the velocity errors ε u f and ε u b in the forward and backward directions and ε ur in the range direction can reach 0.06m/s after iterative correction, which conform to the experimental results in the literature [35]. The velocity and direction error results of the current vectors can be obtained by introducing them into (27), (28) and (29), as the change of error after correction, as shown in Figure 12.…”

Section: B Simulation Of Current Measurement Error Correctionsupporting

confidence: 57%

“…The imaging model used in the iterative correction method is called M4S, which was developed by Roland Romeiser of the University of Hamburg, and is based on the improved composite sea surface model to numerically simulate the characteristics of the ocean surface current [20], [33], [34]. Reference [32] gives the basic concept of iterative current inversion of along-track interferometric SAR based on the M4S model, as shown in Figure 10, where the specific process of current correction can be found in reference [35]. The experimental results in [35] show that the M4S iterative calculation method can reduce the errors caused by the wind field to within 0.06m/s.…”

Section: B Simulation Of Current Measurement Error Correctionmentioning

confidence: 99%

“…Reference [32] gives the basic concept of iterative current inversion of along-track interferometric SAR based on the M4S model, as shown in Figure 10, where the specific process of current correction can be found in reference [35]. The experimental results in [35] show that the M4S iterative calculation method can reduce the errors caused by the wind field to within 0.06m/s. Therefore, this paper considers that the iterative method can be combined with MA-ATI to correct the vector measurement error of the current field.…”

Section: B Simulation Of Current Measurement Error Correctionmentioning

confidence: 99%

See 2 more Smart Citations

Accuracy and Error Analysis of Vector Measurement of Ocean Surface Current by Multi-Aperture Along-Track Interferometric SAR

Chong

Sun

et al. 2020

IEEE Access

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Section: B Simulation Of Current Measurement Error Correctionsupporting

confidence: 57%

Section: B Simulation Of Current Measurement Error Correctionmentioning

confidence: 99%

Section: B Simulation Of Current Measurement Error Correctionmentioning

confidence: 99%

See 1 more Smart Citation

Accuracy and Error Analysis of Vector Measurement of Ocean Surface Current by Multi-Aperture Along-Track Interferometric SAR

Chong

Sun

et al. 2020

IEEE Access

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“…This processing method is in good agreement with the actual situation, but is limited by different sensor data and sea surface position, the measurement accuracy will be different. Yu et al [23] also pointed out that the influence of orbital velocity can be suppressed by space averaging. This operation is simple, but the residual error will be left.…”

Section: Ocean Doppler Information Of Single Antenna Sar Datamentioning

confidence: 99%

Measuring Ocean Surface Current in the Kuroshio Region Using Gaofen-3 SAR Data

Chong

Sun

et al. 2021

Applied Sciences

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The Kuroshio is the strongest warm current in the western North Pacific, which plays a crucial role in climate and human activities. In terms of this, the accurate acquisition of ocean surface current velocity and direction in the Kuroshio region is of great research value. Gaofen-3 synthetic aperture radar (SAR) provides data support for the study of ocean surface current measurements in the Kuroshio region, but no relevant experimental result has been published yet. In this paper, four available stripmap mode SARs’ data acquired by Gaofen-3 in the Kuroshio region are used for measuring the ocean surface current field. In general, the Doppler centroid anomaly (DCA) estimation is a common method to infer ocean surface currents from single-antenna stripmap data, but only the radial velocity component can be retrieved. In order to measure current vectors, a novel method combining the sub-aperture processing and the least squares (LS) technology is suggested and demonstrated by applying to the Gaofen-3 SAR data processing. The experiment’s results agree well with model-derived ocean current data, indicating that the Gaofen-3 SAR has the capability to accurately retrieve the ocean surface current field in the Kuroshio region and motivate further research by providing more data.

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“…In 2000, Romeiser and Thompson [7] proposed a sea-surface Doppler spectrum model based on the improved combined sea-surface model, in which the wave-current interaction and the modulation transmission process of sea-surface backscattering were considered [8,9]. Then, the model was integrated into SAR ocean imaging model and widely used in sea-surface current measurement and simulation [10][11][12]. Therefore, this model provides a possibility for the simulation of two-dimensional sea-surface-current field for trajectory crossing spaceborne SAR.…”

Section: Introductionmentioning

confidence: 99%

A Simulation Method of Two-Dimensional Sea-Surface Current Field for Trajectory Crossing Spaceborne SAR

Chong

2022

Applied Sciences

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The trajectory-crossing method is an important and effective method for spaceborne SAR (synthetic aperture radar) to detect a two-dimensional current field. However, in practical applications, there are few spaceborne SAR data that meet the requirements of close acquisition time and overlapping trajectories, which makes it difficult to comprehensively analyze the impact of different systems and environmental parameters on current measurement results from real data processing. With the proposal of a SAR constellation plan in the future, the data resources will be constantly enriched, and the trajectory-crossing method will be widely used. It is, thus, necessary to lay some theoretical foundation at present. A two-dimensional sea-surface-current-field simulation method for trajectory crossing spaceborne SAR is proposed in this paper. Based on the principles of the trajectory-crossing method, the proposed method can realize the simulation of two-dimensional sea-surface-current field under given spaceborne SAR system and environmental parameters. In this paper, the simulation process of this method is given, and the simulation experiment is performed. Compared with the current measurement results of SAR data, the simulation experiment shows that the current velocity error is less than 0.03 m/s and the direction error is less than 10 degrees, which proves the reliability of the proposed simulation method. The proposed method lays a foundation for analyzing the influence of various parameters in the application of the trajectory-crossing method.

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An Iterative Method for Ocean Surface Current Retrieval by Along-track Interferometric SAR

Cited by 4 publications

References 0 publications

Accuracy and Error Analysis of Vector Measurement of Ocean Surface Current by Multi-Aperture Along-Track Interferometric SAR

Accuracy and Error Analysis of Vector Measurement of Ocean Surface Current by Multi-Aperture Along-Track Interferometric SAR

Measuring Ocean Surface Current in the Kuroshio Region Using Gaofen-3 SAR Data

A Simulation Method of Two-Dimensional Sea-Surface Current Field for Trajectory Crossing Spaceborne SAR

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