Liu T, Yang Z, Marino A, Gao G & Yang J (2020) Robust CFAR Detector Based on Truncated Statistics for Polarimetric Synthetic Aperture Radar. IEEE Transactions on Geoscience and Remote Sensing, 58 (9), pp. 6731 - 6747. https://doi.org/10.1109/tgrs.2020.2979252
Constant false alarm rate (CFAR) algorithms using a local training window are widely used for ship detection with synthetic aperture radar (SAR) imagery. However, when the density of the targets is high, such as in busy shipping lines and crowded harbors, the background statistics may be contaminated by the presence of nearby targets in the training window. Recently, a robust CFAR detector based on truncated statistics (TS) was proposed. However, the truncation of data in the format of polarimetric covariance matrices is much more complicated with respect to the truncation of intensity (single polarization) data. In this article, a polarimetric whitening filter TS CFAR (PWF-TS-CFAR) is proposed to estimate the background parameters accurately in the contaminated sea clutter for PolSAR imagery. The CFAR detector uses a polarimetric whitening filter (PWF) to turn the multidimensional problem to a 1-D case. It uses truncation to exclude possible statistically interfering outliers and uses TS to model the remaining background samples. The algorithm does not require prior knowledge of the interfering targets, and it is performed iteratively and adaptively to derive better estimates of the polarimetric covariance matrix (although this is computationally expensive). The PWF-TS-CFAR detector provides accurate background clutter modeling, a stable false alarm property, and improves the detection performance in high-target-density situations. RadarSat2 data are used to verify our derivations, and the results are in line with the theory.
Electrical and Electronic Engineering; General Earth and Planetary Sciences
IEEE Transactions on Geoscience and Remote Sensing: Volume 58, Issue 9
|Funders||National Natural Science Foundation of China, National Natural Science Foundation of China, National Natural Science Foundation of China, Field Foundation of Illinois and Key Research Plan of Hunan Province|
|Publication date online||31/03/2020|
|Date accepted by journal||19/03/2020|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|