Enhanced Range-Dependent Beampattern Using Frequency Diverse Padded Coprime Array

Frequency diverse coprime array (FDCA) can effectively eliminate the range-angle coupling by selecting virtual frequencies randomly from the second-order statistics of the receive signals. However, the beampattern of this structure is limited by the randomness of frequency offset and the degree of freedom (DoF) of antenna array. In this paper, to improve the performance of beam focusing, several array structures of frequency diverse padded coprime array (FDPCA) are proposed. The proposed schemes can obtain more focused beampattern in virtual domain and enlarge the DoF without the increase of physical element number. The effectiveness of proposed method is validated by numerical simulations.