The Joint Estimation of DOA and Frequency Based on SOBI Approach

The problem of simultaneously estimating the Direction of Arrival(DOA) and frequencies of multiple signals arriving at an antenna array is considered.The paper supplies a computationally simple joint DOA-frequency estimation method based on SOBI(Second-order Blind Identification).Based on statistical properties of sources,the proposed method eliminates the correlation effect of different sources assuming that the temporal-correlation length of sources is limited.A new matrix combining of multiple pseudo-covariance of sources with different time delay is constructed.According to the time-invariant property of the new matrix,the frequency estimation can be obtained by ESPRIT,and then the DOAs are obtained using 1-D searches.Finally,the simulation results show that the proposed method is superior in estimating the DOA and offers good estimation performance of the frequencies.