Abstract:

To solve the problem that it is difficult to obtain the accurate radar cross section (RCS) only by the near-field to far-field transformation due to the inhomogeneity of the antenna pattern, an antenna pattern correction method based on approximate functions is proposed, which compensates the antenna pattern during the process of extrapolating the near-field data, so as to improve the accuracy of obtaining the RCS of the target. Firstly, the process of calculating RCS by using the near-field to far-field transformation is derived. Then the approximate function identical to the antenna pattern is analyzed and the influence of the antenna pattern is corrected by using Fourier expansion in the angular domain the antenna covers. The simulation results show that this method has a good effect on compensating different antenna patterns in the near-field to far-field transformation. The effects on the point target and the line target are verified by experiments. The results show the effectiveness and accuracy of the method.