The accurate identification of aircraft wake vortex core is the premise of dynamically reducing the wake interval. Firstly, the evolution model of the wake vortex field was established, and the wake vortex field was simulated. Secondly, the simulation analysis was carried out on the combined wake vortex velocity field detection results of different intensities and heights. Finally, the "Maximum-Submaximum" method of vortex core position estimation was proposed to improve the accuracy of vortex core position recognition. The research shows that the larger the difference between the maximum and the second maximum at the two peaks of standard deviation is, the closer the distance gate corresponding to the vortex core and the maximum standard deviation is. In the verification of the substituted example, the deviation of the radial distance estimation results is not more than 1.5 m, and the deviation of the vortex core position is within 3 m. Compared with the range method and gradient method, the position deviation has been corrected by more than 60%, and the maximum is 86%.