Migrated coprime array with low mutual coupling for space limited aperture

It is well established that sparse sensor array can estimate more sources than number of sensors exploiting difference coarray. However, the array aperture size is restricted in space limited scenarios and all sensor elements are distributed in limited space. This could raise potential problems due to the mutual coupling effect. To address this issue, a migrated coprime based sparse array configuration is designed considering the following schemes. Enhancing the length of consecutive part in difference coarray while introducing no extra sensor. The mutual coupling level is reduced as low as possible, and the array aperture is also limited to acceptable level to allow possible applications in space limited scenarios. Simulation results elaborate the superiority of proposed strategy from the above aspects.