MODE SPACE SMOOTHING ALGORITHM FOR DOA ESTIMATION OF COHERENT SOURCES WITH UNIFORM CIRCULAR ARRAY
均匀圆阵相干信源DOA估计的模式平滑算法

A novel method to estimate DOAs of coherent sources impinging on an uniform circular array(UCA) is presented in this paper. A virtual uniform linear array(VULA) is first derived by DFT preprocessing, transforming the UCA from element space to phase mode space which is special for circular arrays, and then the well-known spatial smoothing technique is applied to the VULA so that the decreased rank of covariance matrix due to coherence can be retrieved. Simulation results have strongly verified the effectiveness of the algorithm.