In the dynamic electromagnetic environments

a polarization estimator is usually utilized by the adaptive polarization filter to get the knowledge of the polarization of interference fields.The optimal polarization will be then calculated for the use of polarization filtering.In this sense an adaptive polarization filter can be modeled as an open-loop cascade system of a polarization estimator

an optimum polarization calculator and a polarization filter.Theoretical performance of the polarization estimator is analyzed for the case of polarization vector estimation based on the dual-channel orthogonal polarization measurements.It is proved that the polarization estimation error obeys the Rayleigh distribution approximately.By studying the transmission process of the estimation error in a polarization filter

a series of analytic formulae on the performances of adaptive polarization filters are derived

which stochastically reveal the relationship between the filtering performance and such factors as the signal-to-noise ratio clearly.