Deconvolved frequency-difference beamforming for a linear array
Lei Xie, Chao Sun, Jiwei Tian
Abstract
Frequency-difference beamforming (FDB) provides a robust estimation of wave propagation direction by shifting signal processing to a lower frequency which, however, produces a decline in the spatial resolution. In this letter, the beam pattern of FDB for a distant point source is proved to be shift invariant and therefore can be regarded as the point spread function corresponding to FDB's beam output. Then, deconvolved frequency-difference beamforming (Dv-FDB) is proposed to improve array performance. Dv-FDB yields a narrower beam and lower sidelobe levels while maintaining robustness. The superior performance of Dv-FDB is verified by simulations and experimental data.
Topics & Concepts
BeamformingRobustness (evolution)AcousticsBeam patternBeam (structure)Computer scienceSIGNAL (programming language)PhysicsSignal processingOpticsTelecommunicationsRadarChemistryProgramming languageBiochemistryGeneDirection-of-Arrival Estimation TechniquesSpeech and Audio ProcessingAntenna Design and Optimization