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A good initial guess is critical for the convergence of the steepest descent method. This paper presents a new method to estimate the initial guess of the near field phase. Based on image theory, tangential near fields on two scanning planes are linked by a radiation matrix. The radiation matrix is then scaled by the near field amplitudes. It is shown that the phase of an eigenvector of the scaled...
The phase of near Held plane wave spectrum is useful for phased-array calibration. In order to calculate the phase of near fleld plane wave spectrum accurately, the influence of near-fleld scanning parameters on plane wave spectrum phase error is studied in this paper. The calculation of near field plane wave spectrum is efficiently implemented by using the fast Fourier transform. The accuracy of...
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