DOA estimation of wideband LFM signals for nonuniform linear array

A novel DOA estimation algorithm of wideband LFM signals is proposed which can be applied to nonuniform linear array. Based on the FrFT, the algorithm first establishes the array data model in fractional Fourier domain, and then defines the generalized rotation matrix between subarrays according to the time delay between different array elements. By using the generalized rotation matrix, the conventional ESPRIT algorithm is revised, and hence achieves the DOA estimation of signals. Two implementations of the proposed algorithm are also developed, and simulation results verified the efficiency of the algorithm.