DOA Refinement Through Complex Parabolic Interpolation of a Sparse Recovered Signal
Luca Pallotta, Gaetano Giunta, Alfonso Farina
Abstract
This letter considers the design of a two-stage direction of arrival (DOA) scheme for radar systems. Precisely, at the first stage a sparse recovery approach is used to obtain both DOA and complex amplitude estimates of the incoming signal. Since the DOA is evaluated on a predefined grid of bins sampling the antenna azimuth mainbeam, at the second stage, a closed-form complex-valued parabolic interpolation is performed to refine it. By doing so, the angle accuracy is improved, but at the same time maintaining fixed the overall computational complexity. Numerical results show the enhancement provided by the proposed procedure to the initial sparse recovery method.
Topics & Concepts
Interpolation (computer graphics)AzimuthAlgorithmComputer scienceSignal reconstructionComputational complexity theorySIGNAL (programming language)Antenna (radio)RadarSampling (signal processing)GridMathematicsSignal processingComputer visionTelecommunicationsDetectorGeometryMotion (physics)Programming languageDirection-of-Arrival Estimation TechniquesRadar Systems and Signal ProcessingStructural Health Monitoring Techniques