An Effective Frequency-Spatial Filter Method to Restrain the Interferences for Active Sensors Gain and Phase Errors Calibration

In the conventional active calibration algorithms for sensors gain and phase errors, the interference did not be considered. However, the interferences are unavoidable in the practical application. In this paper, an effective frequency-spatial filter (SF) method to restrain the interferences for active sensors gain and phase errors calibration is presented. The proposed method first search the frequency range of the lowest power from the interferences, and then filter out the interferences out of the frequency range through a group of bandpass filter (BF) groups. Further, the proposed method uses an SF to suppress the interferences with nonzero power in the frequency range of the selected BF. Through the above two steps, almost all of interferences can be filtered out. Simulation results illustrate the validity of the proposed method.