Accession number: 20183305688622
Title of translation: Wishart分布情形下极化SAR图像目标CFAR检测解析方法
Authors: Zhang, Jia-Feng 1 ; Zhu, Bo 2 ; Zhang, Peng 1 ; Wang, Ming-Chun 1 ; Liu, Tao 1
Author affiliations : 1 School of Electronic Engineering, Naval University of Engineering, Wuhan; Hubei; 430030, China
2 Institute of Information and Technology, Naval Academy of Armament, Beijing; 102200, China
Corresponding author: Liu, Tao (firstname.lastname@example.org)
Source title: Tien Tzu Hsueh Pao/Acta Electronica Sinica
Abbreviated source title: Tien Tzu Hsueh Pao
Issue date: February 1, 2018
Publication Year: 2018
Document type: Journal article (JA)
Publisher: Chinese Institute of Electronics
Abstract: The equivalent number of looks (ENL) is a key parameter that affects the constant false alarm rate (CFAR) detection performances in polarimetric synthetic aperture radar (PolSAR) imageries.At present, the estimated value of the ENL mostly is not an integer, resulting that existing CFAR detection algorithms are no longer applicable.To solve this problem, a new analytical CFAR algorithm of target detection is proposed in PolSAR imageries.Firstly, the probability density function (PDF) of multi-look polarimetric whitening filter (MPWF) metric is derived based on Wishart distribution assumption; Secondly, the analytical expression of CFAR detection threshold with respect to the ENL is obtained by integrating the PDF of MPWF metric; Finally, the CFAR detection performances of the new algorithm are compared with other CFAR detection algorithms via simulation data and AIRSAR measured data.The results show that the real false alarm probability in the new algorithm is the closest to the given constant false alarm probability, which better guarantees the hypothesis of the constant false alarm probability in the CFAR detection.
© 2018, Chinese Institute of Electronics. All right reserved.
Number of references: 20
Main heading: Probability density function
Controlled terms: Alarm systems - Errors - Image resolution - Polarimeters - Probability distributions - Radar imaging - Radar measurement - Signal detection - Synthetic aperture radar
Uncontrolled terms: Analytical expressions - Constant false alarm rate detections - Equivalent number of looks - Polarimetric synthetic aperture radars - Wishart distribution
Classification code: 716.1Information Theory and Signal Processing - 716.2Radar Systems and Equipment - 922.1Probability Theory - 941.3Optical Instruments
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