2-D DOA Estimation of Coherent Wide-Band Sources for Arbitrary Array Plane Geometry

摘要

Direction of Arrival (DOA) estimation is of big importance in Sonar, Radar and satellite systems. In this work, we estimated the 2-D DOA (two-dimensional DOA) of coherent wide-band sources by using a broadband focusing method, which was based on the separation of angle and frequency of the array manifold matrix. At first, we transform the element position of the plane array into the spherical coordinates. Then we adopted a generalized Fourier series expansion based on the spherical harmonics and the first kind of spherical Bessel functions to get the arbitrary plane array steering vector. In this vector, the angle and frequency of array manifold matrix was separated, so we could get the matrix of focusing transformation. Finally, we used the traditional narrow-band algorithm to estimate the 2-D DOA. The design is suitable for arbitrary array geometry models of coherent broadband signals, and avoids the angle pre-estimation in traditional methods. Simulation results demonstrate its validity and better performance.