Paper Info
Title
Improving The Image Quality Of Moving Ships For Gf-3ng Based On Simultaneous Ais Information
Abstract
The synthetic aperture radar (SAR) is an important means of ship surveillance, but the motion of the ship leads to azimuth position offset, false targets, and azimuth defocusing for the spaceborne high-resolution and wide-swath (HRWS) SAR system, causing the degradation of imaging quality. The automatic identification system (AIS) can provide real-time information of the ships, which is an important auxiliary method for ship surveillance. Up to now, the traditional fusion of SAR and AIS mainly has focused on location matching and auxiliary recognition, and the next generation of GaoFen-3 (GF-3NG) satellite is equipped with both a SAR sensor and an AIS sensor to obtain the SAR images and simultaneous AIS information of ships. Consequently, this paper proposes a novel scheme to improve the imaging quality of moving ships for GF-3NG using AIS information. In this paper, through introducing the virtual stationary target, the slant range derivation (SRD) algorithm is proposed to estimate the radial velocity (RV) and the radial acceleration (RA) between the ship and the SAR platform relative to the stationary scene. According to the calculated RV, the azimuth position offset can be estimated and the ship can be repositioned on the image. After that, the traditional method is conducted to suppress the false targets. Finally, the method of using the RA to refocus ship slices is proposed. Additionally, the experiment results based on real data illustrate the effectiveness of the proposed methods.
Year
DOI
Venue
2021
10.3390/rs13101951
REMOTE SENSING
Keywords
DocType
Volume
SAR, AIS, relative RV, relative RA, azimuth offset correction, false target suppression, refocus
Journal
13
Issue
Citations 
PageRank 
10
0
0.34
References 
Authors
0
7
Name
Order
Citations
PageRank
Yini Lv100.34
Lihua Zhong200.68
Xiaolan Qiu312.72
Xinzhe Yuan4476.58
Junying Yang510.70
Yuxin Hu616.77
Chibiao Ding722333.52