A recognition method depended on enlarge the difference between target and chaff

This paper proposed a target recognition method to distinguish ships from chaff by polarization information, aiming at fully polarized dual-channel radars with low resolution. The method expands the original single polarization radar system to dual polarization radar system with both left and right circular polarizations by receiving and processing the full polarization information of radar echoes. It recognize the target by taking advantage of the difference of the left and right circular depolarization characteristic parameters of the target and chaff in radar echoes, after enlarging the difference between the cross- polarization component and co-polarization component of the radar echoes involving both target and chaff, furthermore, non-linear polarization transformation is adopted to increase the chaff and targets respectively, and to improve the recognition rate in result. In the end, the recognition result is proved to be more desirable by processing information in polarization domain than in time and frequency domain.