The Intrinsic Mode Function Time Delay Method for beamforming

This paper presents the Intrinsic Mode Function Time Delay Method (IMFTDM) which is based on Hilbert Huang Transform (HHT) and its application in beamforming. The IMFTDM can delay the broadband Intrinsic Mode Function (IMF) by arbitrary time accurately. And in this work, the IMFTDM is performed using the simulated and real data in beamforming to test its performance. The results show that it can improve the array gain and the accuracy of Direction of Arrival (DOA) estimation. With discussion, we suggest that these advantages are attributed by the following reasons. The single IMF generally has less noise and better correlation result than original data and the IMFTDM can provide better time delay.