A Modified Wideband Direction of Arrival Estimator Based on Spectrum Smoothing

摘要

DOA estimation for wideband sources with sensor arrays is one of the key issues in acoustic tracking. An improvement on the wideband DOA estimation is proposed. The new coyariance matrix of the frequency bin is obtained by averaging the covariance matrices of its adjacent frequency bins, and then the general wideband algorithms are used to estimate the DOAs. Compared with the wideband algorithm without covariance matrix smoothing, the improvement has higher resolution and smaller root mean square error except high signal-noise-ratio. The theoretical expressions indicate that the improvement is effective. The performance of the improvement is also demonstrated and analyzed through the computer simulations.