Applying a High Efficient Time-Frequency Analysis Method in DOA Estimation

In the studies of DOA estimation based on time-frequency analysis, eliminating cross interference terms is the key to improve DOA estimation performance for the situation of multi-signal. The SPW time-frequency analysis is used in this paper to make DOA estimation. SPW combines the virtues of WVD and STFT that it not only possesses quite high time-frequency concentration performance but can also suppress the cross terms in WVD. Furthermore, it can overcome the shortcomings of SPWVD that many excellent characteristics of WVD are lost and the time-frequency concentration performance of signal drops correspondingly due to the windowing and the smoothing processing. Simulation results demonstrate that the in multi-source situation, compared with the methods based on PWVD and SPWVD, the method based on SPW improves the DOA estimation precision much more greatly