WANG Yunhua, LIU Xiaoyan, LI Huimin, ZHANG Yanmin. Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data[J]. Acta Oceanologica Sinica, 2015, 34(1): 85-93. doi: 10.1007/s13131-015-0601-3
Citation: WANG Yunhua, LIU Xiaoyan, LI Huimin, ZHANG Yanmin. Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data[J]. Acta Oceanologica Sinica, 2015, 34(1): 85-93. doi: 10.1007/s13131-015-0601-3

Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data

doi: 10.1007/s13131-015-0601-3
  • Received Date: 2014-04-24
  • Rev Recd Date: 2014-09-10
  • Azimuth ambiguities (ghost targets) discrimination is of great interest with the development of a synthetic aperture radar (SAR). And the azimuth ambiguities are often mistaken as actual targets and cause false alarms. For actual targets, HV channel signals acquired by a fully polarimetric SAR are approximately equal to a VH channel in magnitude and phase, i.e., the reciprocity theorem applies, but shifted in phase about ±π for the first-order azimuth ambiguities. Exploiting this physical behavior, the real part of the product of the two cross-polarized channels, i.e. (SHVSVH*), hereafter called A12r, is employed as a new parameter for a target detection at sea. Compared with other parameters, the contrast of A12r image between a target and the surrounding sea surface will be obviously increased when A12r image is processed by mean filtering algorithm. Here, in order to detect target with constant false-alarm rates (CFARs), an analytical expression for the probability density function (pdf) of A12r is derived based on the complex Wishart-distribution. Because a value of A12r is greater/less than 0 for real target/its azimuth ambiguities, the first-order azimuth ambiguities can be completely removed by this A12r-based CFAR technology. Experiments accomplished over C-band RAdARSAT-2 fully polarimetric imageries confirm the validity.
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