To address the issue of low wake vortex retrieval accuracy caused by the large radial resolution of lidar,cubic interpolation and cubic spline interpolation are applied to interpolate the radial wind field of wake vortices between lidar range gates at densities of 1,2,4,and 8 meters.And the gradient method is then used to invert the vortex core positions.Subsequently,the gradient method is improved by applying cubic interpolation and cubic spline interpolation between the maximum absolute gradient values across range gates at the same densities (1,2,4,8 meters).Finally,a resolution enhancement method based on cubic spline interpolation is proposed to improve vortex core identification accuracy through the enhanced gradient method.Studies demonstrate that cubic spline interpolation achieves better consistency with wake vortex data compared to cubic interpolation.In numerical cases,the maximum correction rates for vortex core positions reach 20%～35% using cubic interpolation and 39%～71% using cubic spline interpolation.When comparing the efficiency of the wake vortex radial wind field interpolation algorithm and the improved gradient method in identifying vortex cores,the time consumption of the improved gradient method is reduced by 82% compared to the interpolation algorithm.