Owing to the lack of polarization freedom and the power-driven， the polarization filter cannot meet the demand of setting notch at the interference and setting peak at the target simultaneously. This disadvantage is considered as the fundamental of corrupting filter. The jammer can prevent the radar from obtaining the precise target， interference polarization parameters and stable related interference and noise reference data necessary for the filter by controlling the mode and sequence of polarization of the transmit signal polarization modulation， which in turn prevents the filter notch from aligning with the interference and ensures that sufficient interference signal is received by radar receiver. We analyze the processing characteristics of various polarization filters and predict the filter output performance for various interference backgrounds to obtain the best polarization modulation scheme against each filter. The schemes are verified by simulation experiments.

To impair the accuracy of polarization measurement of radar and hinder the construction of polarization filter， a study of full-polarization interference technology on polarization measurement and a robust， adaptable and operational polarization modulation method are provided. A classic polarization measurement based on the elaborately deduced signal model is described along with its performance analysis. It clarifies that it is the lack of polarization freedom and the power-driven lead to the inherent disadvantage， which is of fundamental importance to interference. Furthermore， it predicts the results imposed by some commonly used interference modes and modulations theoretically， which are verified by simulation experiments. For all above research， the random-polarization interference performs more effective in polarization measurement.