A Cascade Calibration of Near-Field Source Gain and Phase Errors

Based on instrumental sensors, a method of cascade estimation of the near-field signal source using the symmetric uniform linear array is proposed. The method realizes the separation, decoupling and estimation of parameters by reconstructing the virtual array and steering vector transformation. The method has no loss of aperture in reconstructing the virtual array, avoids the multi-dimensional spectrum search and is more practical. Compared with the traditional methods, the method is less computationally intensive, the gain and phase error calibration accuracy is higher, and the parameter estimation accuracy is higher. Simultaneously, cascading estimation enables real-time estimation of the azimuth, range, and error parameters, and simulation experiments show the performance of the proposed algorithm in this paper.