A Novel Coprime Array for High-Performance in Direction-of-Arrival Estimation

The prototype coprime array exhibits holes in the virtual array, which decreases the number of degrees-of-freedom (DOFs) of the array. Moreover, although the prototype coprime array can achieve aperture expansion compared to the uniform array, its aperture remains capable of further expansion. In this paper, we propose a new coprime array called compression and offset amalgamated (COA) array by reconstructing the prototype coprime array. With a fixed number of sensors, the proposed array achieves aperture expansion with no holes in the virtual array. Simulation results demonstrate that, COA array exhibits superiority in fields like direction-of-arrival (DOA) estimation performance and spatial resolution.