Spaceborne synthetic aperture radar is of great significance in ship monitoring. Estimation of motion parameters of moving ships has a high application value in civil and military fields. In this paper, we propose a method to estimate azimuth velocity of moving ships in spaceborne SAR as well as improve the image quality. This method is applied directly on the single-look complex (SLC) image data, and does not demand extra information or special configurations. Applying Newton’s method to search the calibration phase corresponding to the minimum of the entropy, the Doppler frequency modulation (FM) rate and azimuth velocity of ships can be obtained by fitting the quadratic coefficient of the correction phase, and the image blur caused by the movement of ships is effectively alleviated by means of phase compensation. Finally, the proposed method is validated by the Gaofen-3 (GF-3) complex data, and the experimental results perfectly fit the data recorded by the international automatic identification system, which explains the effectiveness of the proposed approach.
Ship Azimuth Velocity Estimation in Spaceborne SAR Based on Minimum-Entropy Criterion and Newton’s Method
Lect. Notes Electrical Eng.
China High Resolution Earth Observation Conference ; 2020 ; Changsha, China November 17, 2020 - November 19, 2020
Proceedings of the 7th China High Resolution Earth Observation Conference (CHREOC 2020) ; Kapitel : 38 ; 523-534
11.01.2022
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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