Detection method for active false-target based on differences of polarimatric frequency response

A method using polarization information to detect active false targets introduced by digital radio frequency memory (DRFM) system is presented. Polarization scattering matrixes (PSM) of physical target will be changed along with the frequencies of transmitted pulses, while the equivalent PSMs of active false target are determined by polarimatric characteristics of antennas (or polarimatric modulation) of jammer, and will remain unchanged. Based on this difference of frequency response, binary hypothesis test is used to detect active false target. Firstly, the detection principle is introduced in details; polarization ratio is defined and used as test statistic. Secondly, probability density function (pdf) of polarization ratio is derived to analysis the detection performance, together with PSMs of scale modes measured in microwave anechoic chamber. Finally, simulation results are presented to verify the effectiveness of this method, and the effects of some key parameters on detection performance are analyzed.