This paper deals with coherent radar polarimetric adaptive detection of targets in partially-homogeneous Gaussian clutter background with unknown covariance matrix.Based on generalized likelihood ratio test(GLRT)

polarimetric adaptive subspace detector(PASD) is derived.The theoretical expressions of PFA and PD for PASD are derived.The proposed detection algorithm ensures the constant false alarm rate (CFAR) in homogeneous and partially-homogeneous clutter background.We resort to simulation to analyse the performance of PGLRT

PAMF

PASD in homogeneous clutter and PASD in partially-homogeneous clutter in different polarimetric cases.