Frequency diverse array radar for target range-angle estimation

Purpose – Frequency diverse array (FDA) radar with uniform frequency offset between antenna elements has been proposed and investigated, which exhibits a range-angle-dependent beampattern. Nevertheless, because of the coupling in range and angle responses, it cannot estimate directly both the range and angle information of a target. The purpose of this paper is to consider a sub-array scheme of range-angle joint estimation of a target for FDA radar. Design/methodology/approach – First, the entire array is divided into two sub-arrays, which employs two different frequency offsets. For aperture extension, each sub-array adopts difference co-array structure. Therefore, the targets range and angle can be estimated directly with the subspace-based multiple signal classification algorithms for the decoupling capability of distance and angle dimensional. The estimation performance is examined by analyzing the Cramer-Rao lower bound (CRLB) vs signal-to-noise ratio. Findings – Each sub-array adopts difference co-a...