A METHOD FOR ARRANGEMENT OF AUXILIARY ANTENNAS TO MINIMIZE THE INFLUENCE OF THE INCIDENT DIRECTIONS OF INTERFERENCES ON SUPPRESSION PERFORMANCE IN A MULTIPLE SIDELOBE CANCELER

The necessity for a multiple sidelobe canceller (MSLC) that suppresses several interference waves incident corresponding to complex radio en vironment is increasing. In the MSLC, there exists interference incide nt directions for which the suppression capability is degraded substan tially, depending on the arrangement of auxiliary antennas. In this pa per, the problem of degradation of the suppression capability of sever al interference waves depending on the direction of incidence is studi ed in the case where the two interference waves are suppressed by the MSLC with two auxiliary antennas. The relationship of the suppression capability to the receiving phase difference between the auxiliary ant ennas for each interference wave is discussed. Further, based on the r esults, an arrangement method of the auxiliary antennas minimizing the suppression capability degradation is presented. It is shown by numer ical calculations that the suppression capability degradation can be i mproved by means of the configuration of the auxiliary antennas obtain ed by this method.