Article

The Polarimetric Detection Optimization Filter and Its Statistical Test for Ship Detection

Details

Citation

Liu T, Jiang Y, Marino A, Gao G & Yang J (2021) The Polarimetric Detection Optimization Filter and Its Statistical Test for Ship Detection. IEEE Transactions on Geoscience and Remote Sensing, 60, Art. No.: 5202218. https://doi.org/10.1109/tgrs.2021.3055801

Abstract
Ship detection via synthetic aperture radar (SAR) has been demonstrated to be very useful as polarimetric information helps discriminate between targets and sea clutter. Among the available polarimetric detectors, optimal polarimetric detection (OPD) theoretically provides the best detection performance under the assumption that the fully developed speckle hypothesis stands. This study proposes a polarimetric detection optimization filter (PDOF). The target clutter ratio (TCR) over the speckle variation was maximized using a matrix transform to derive the PDOF. The objective function based on a matrix transform instead of a vector transform is optimized to obtain synthetic effects by combining a polarimetric whitening filter (PWF) and a polarimetric matched filter (PMF). Subspace form of the PDOF (SPDOF) is also proposed, which gives performance comparable to the PDOF. Assuming a Wishart distribution, the exact and approximate expressions of the closed-form probability density function (PDF) of the PDOF are derived. The probability of false alarm (PFA) was derived in a closed-form expression, which allows obtaining the PDOF threshold analytically. Moreover, the gamma model is extended to a generalized gamma distribution (GΓD) to adapt complicated resolutions and sea states. Experiments with simulated and real data validate the correctness and effectiveness of the results. The PDOF detector achieves the best performance in most virtual and real-world environments, especially in cases where the target statistics and clutter are not Wishart-distributed.

Keywords
Optimal polarimetric detection (OPD); polarimetric matched filter (PMF); polarimetric whitening filter (PWF); probability density function (PDF); synthetic aperture radar (SAR); constant false alarm rate (CFAR)

Journal
IEEE Transactions on Geoscience and Remote Sensing: Volume 60

StatusPublished
FundersNational Natural Science Foundation of China, National Natural Science Foundation of China, National Natural Science Foundation of China, Field Foundation of Illinois, Fundamental Research Funds for the Central Universities and Key Research Plan of Hunan Province
Publication date31/12/2021
Publication date online28/02/2021
Date accepted by journal22/01/2021
URLhttp://hdl.handle.net/1893/32377
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISSN0196-2892
eISSN1558-0644

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People

Dr Armando Marino
Dr Armando Marino

Senior Lecturer in Earth Observation, Biological and Environmental Sciences