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      Study on Adaptive Digital Beamforming for Spaceborne SAR Based on Capon Spatial Spectrum Estimation

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          Abstract

          In rough mountainous areas, beam-pointing mismatch problems always arise when a spaceborne Synthetic Aperture Radar (SAR) uses the traditional Digital BeamForming (DBF) approach in elevation to receive echoes, leading to the degradation of the receiver’s gain and system Signal-to-Noise Ratio (SNR). To solve this problem, an Adaptive Digital BeamForming (ADBF) approach based on the Capon spatial spectrum estimation is proposed. This approach first estimates the Angle Of Arrival (AOA) of the source signal in each range bin using the limited echo data. Then, it updates the weighting vector in the beamforming process, thereby enabling the receiving beams to precisely point to the signal source, and enhance the receiver’s gain and SNR.Simulation results suggest that the ADBF approach significantly improves the performance compared to the SCan-On-REceive (SCORE) approach, exhibiting robustness to system and source parameters variations.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 February 2014
          : 3
          : 1
          : 53-60
          Affiliations
          [1 ] China Academy of Space Technology, Xi’an Branch
          Article
          f631fa63b0c34918ad596f3856002450
          10.3724/SP.J.1300.2014.13131

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

          Categories
          Technology (General)
          T1-995

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