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Summary of Proposal MTH0923

TitlePolarimetric characteristics analysis of ship target, azimuth ambiguities and sea clutter for ship detection by using TerraSAR-X images
Investigator Wang, Changcheng - Central South University, School of Info-Physics and Surveying Engineering
Team Member
Mr. Xie, Qinghua - Central South University, School of Info-Physics and Surveying Engineering
Prof. Li, Zhiwei - Central South University, School of Info-Physics and Surveying Engineering
Mr. Yi, Heng - Central South University, School of Info-Physics and Surveying Engineering
SummarySAR image from sea can constantly contain ships and their ambiguities in azimuth and range directions. For maritime applications, the ambiguities are visible due to their strong intensities in a typical low backscattering background from sea. Thus, the ambiguities can be mistaken as ships. The azimuth ambiguity is caused by the finite sampling of the Doppler spectrum at intervals of the pulse repetition frequency (PRF). Since the spectrum repeats at PRF intervals, the signal components outside this frequency interval fold back into the main part of the spectrum. The range ambiguity is due to the time overlap of echoes from preceding and succeeding pulses that can arrive at the antenna simultaneously with the desired return. Traditional ship detection methods cannot effectively remove the false alarms caused by ambiguities. Therefore, the main objective of this project is to analyze the scattering mechanism of ship target, azimuth ambiguities and sea clutter and develop a ship detection method which can effectively eliminate the effect of ambiguities. We will study polarimetric characteristics of ships, azimuth ambiguities and sea clutter by using TerraSAR-X dual-pol and full-pol data with different mode (spotlight or stripmap), incident angle or spatial resolution. Based on this analysis, we will develop some new ship detection methods for PolSAR data. In this project, we require some TerraSAR-X single-pol, dual-pol and full-pol data covered sea area near Shanghai, Hongkong, Tianjin or Hainan in China, which is convenient for carrying out ground truth observation. Meanwhile, we need the data with different mode (i.e. spotlight or stripmap), incident angle or spatial resolution. The team has gained experience in using SAR/PolSAR data to study ship detection application. We are well equipped with both necessary hardware and software for SAR data processing and analysis. Our research has been supported by National Science Foundation of China “Study on ship detection method based on polarimetric scattering mechanisms of PolSAR image”.

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