The partially polarized signal detection is investigated for the first time based on the polarization sensitive array.The signal detection is modeled by the binary hypothesis test.Under Gaussian distribution

the likelihood ratio is obtained by exploiting the matrix eigendecomposition.The detecting scheme is presented according to the statistical test.The probability distribution function is acquired under the null hypothesis and the alternative hypothesis respectively.According to the Neyman-Pearson rule

the probability of detection is calculated at a certain probability of alarm.Furthermore

especially

the detection performance is analyzed under structured noise.How the factors affect the detection performance is drawn from a series of numerical examples

such as the polarization degree of signal

the Interference to Noise Ratio

the polarization degree of interference and the arrival angle of interference.