Incongruous coupling coherent weak signal direction finding method

The invention belongs to the field of radio direction finding, and particularly relates to an incongruous coupling coherent weak signal direction finding method. Parameters of strong signals are determined according to relevant parameters of direction finding equipment, cross-correlation vectors between array snapshot signals and strong signal waveforms are obtained, and then Wiener filtering vectors and MVDR filtering vectors are determined; then determining a coherent vector; then, corresponding to the search directions in the search direction set, respectively determining an incongruous coupling coefficient of a direction vector and a coherent vector corresponding to each search direction in the direction vector set; and finally, determining an incongruous coupling coefficient set corresponding to the search direction set, and determining an incongruous coupling coherent weak signal direction finding result according to the direction corresponding to the maximum value in the incongruous coupling coefficien