Special issue on Co-prime sampling and arrays

Co-prime sampling and co-prime arrays have recently been shown to improve active and passive sensing in radar and under-water acoustics using both narrowband and wideband signal plat-forms. Co-prime processing provides a systematical framework for sparse sampling and array configuration with increased aperture and improved spatial resolution. Co-prime based approaches to sampling and arrays can combat ambiguity and provide unique answers to target coordinates under forced coarse sampling in time, frequency, and space. Temporal and spatial co-prime samplings make advances in direction-of-arrival (DOA) estimation, spectrum sensing, and sparse covariance sketching. They find broad applications in synthetic aperture radar (SAR), radio frequency (RF) surveillance, target localization, wideband urban radar processing, space–time adaptive processing, and nonstationary array processing utilizing Doppler signatures and instantaneous frequency source characteristics