A combined error calibration technique with experiment for frequency-space spectrum estimation

YU Jing The mechanism of the performance degradation for space-frequency spectrum estimation due to channel mismatching and sensor coupling is analyzed. In order to overcome existed methodsʹ limitation that can only compensate one or two influent factors, a new comprehensive calibration method that can compensate channel mismatching and sensor coupling is proposed which improves the calibration precision greatly. It is applied to estimate directions and frequencies simultaneously, and an important conclusion that these influent factors can not affect frequency-estimation is drawn. This method is easy to be implemented and the results of acoustic experiments in anechoic room show its effectiveness.