Polarimetrical processing detection circuit for radar receiver

摘要

This target detection polarimetrical processing circuit comprises, in parallel, a polarimetrical CFAR detector provided with a target detection output, a polarimetrical clutter-rejection filter associated with a CFAR detector provided with a target detection output and a bank of polarimetrical filters associated with CFAR detectors provided with target detection outputs, and an "OR" type logic circuit combining the different target detection outputs and a selection circuit activating the polarimetrical clutter-rejection filter and disabling the bank of polarimetrical filters when the degree of polarization of the clutter exceeds a certain threshold and conversely disabling the polarimetrical clutter-rejection filter and activating the bank of polarimetrical filters when the degree of polarization of the clutter is below said threshold. The circuit makes use of the complementary features of the polarimetrical clutter-rejection filter, the polarimetrical CFAR detector and a bank of polarimetrical filters to carry out an optimal target detection whatever the degree of polarization of the clutter, the signal- to-clutter ratio and the instantaneous polarization of the target echo.