Journal of Systems Engineering and Electronics ›› 2009, Vol. 31 ›› Issue (10): 2294-2298.

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Subarray multibeamforming with symmetric exponentially spaced array

ZENG Cao, HE Xue-hui, LIAO Gui-sheng, TAO Hai-hong   

  1. (Key Lab. of Radar Signal Processing, Xidian Univ., Xi’an 710071, China)
  • Published:2010-01-03

Abstract:

      An optimized method for the phase centres of subarray based on the symmetric exponentially distribution and a nonuniform window of the subarray are proposed to realize the subarray multibeamforming and avoid the grating lobe due to the uniform sparse phase centers of subarray. Firstly, given the aperture and the number of the array, the phase centers of the subarray are optimized through an approach of choosing the approatiate exponential parameter. Secondly, an nonuniform Taylor window is derived for the sidelobe control according to the optimized phase centers. Finally, the subarray multibeamforming can be achieved with the windowed steering vector pointing at the various directions. Simulation results show that the linear array with the optimized phase centers and the nonuniform window has the advantages of no grating lobe, low sidelobe level nearby the mainlobe and the high array efficiency over other methods; the pattern results of the method applied in the linear array composed of symmetric array elements agree with that of numerical electromagnetic code (NEC) software; the proposed method spreading to the plane array of symmetric exponentially distribution is also available.

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