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FIM Beamforming for Sparse Array

JIANG Han,SHAO Jie (College of Information Science and Technology,Nanjing University of Aeronautics & Astronautics,Nanjing 210016,China)  
In this paper interpolation technique is used for processing the FIM(Fourier Integral Method) beamforming of equispaced linear sparse array.The method not only increases the effective numbers of the elements,but also overcomes the disadvantage of angle ambiguity,which is caused by the element spacing larger than half-wavelength.Meanwhile,the method improves the performance of directivity and noise rejection.The design process of virtual array is given by studying the interpolation algorithm and FIM beamforming.The effectiveness of this method is verified by processing computer simulation data and real sonar sea test data.
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